[release-branch.go1.15] cmd/compile: do not assume TST and TEQ set V on arm

These replacement rules assume that TST and TEQ set V. But TST and
TEQ do not set V. This is a problem because instructions like LT are
actually checking for N!=V. But with TST and TEQ not setting V, LT
doesn't do anything meaningful. It's possible to construct trivial
miscompilations from this, such as:

    package main

    var x = [4]int32{-0x7fffffff, 0x7fffffff, 2, 4}

    func main() {
        if x[0] > x[1] {
            panic("fail 1")
        }
        if x[2]&x[3] < 0 {
            panic("fail 2") // Fails here
        }
    }

That first comparison sets V, via the CMP that subtracts the values
causing the overflow. Then the second comparison operation thinks that
it uses the result of TST, when it actually uses the V from CMP.

Before this fix:

    TST             R0, R1
    BLT             loc_6C164

After this fix:

    TST             R0, R1
    BMI             loc_6C164

The BMI instruction checks the N flag, which TST sets.  This commit
fixes the issue by using [LG][TE]noov instead of vanilla [LG][TE], and
also adds a test case for the direct issue.

Updates #42876.
Fixes #42930.

Change-Id: I13c62c88d18574247ad002b671b38d2d0b0fc6fa
Reviewed-on: https://go-review.googlesource.com/c/go/+/282432
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>

3 files changed, 235 insertions, 217 deletions

diff --git a/src/cmd/compile/internal/ssa/gen/ARM.rules b/src/cmd/compile/internal/ssa/gen/ARM.rules
index ab8bd0e81e5..c69084a7010 100644
--- a/src/cmd/compile/internal/ssa/gen/ARM.rules
+++ b/src/cmd/compile/internal/ssa/gen/ARM.rules
@@ -1369,38 +1369,38 @@
 (LE (CMPconst [0] l:(ADDshiftLLreg x y z)) yes no) && l.Uses==1 -> (LEnoov (CMNshiftLLreg x y z) yes no)
 (LE (CMPconst [0] l:(ADDshiftRLreg x y z)) yes no) && l.Uses==1 -> (LEnoov (CMNshiftRLreg x y z) yes no)
 (LE (CMPconst [0] l:(ADDshiftRAreg x y z)) yes no) && l.Uses==1 -> (LEnoov (CMNshiftRAreg x y z) yes no)
-(LT (CMPconst [0] l:(AND x y)) yes no) && l.Uses==1 -> (LT (TST x y) yes no)
-(LT (CMPconst [0] l:(ANDconst [c] x)) yes no) && l.Uses==1 -> (LT (TSTconst [c] x) yes no)
-(LT (CMPconst [0] l:(ANDshiftLL x y [c])) yes no) && l.Uses==1 -> (LT (TSTshiftLL x y [c]) yes no)
-(LT (CMPconst [0] l:(ANDshiftRL x y [c])) yes no) && l.Uses==1 -> (LT (TSTshiftRL x y [c]) yes no)
-(LT (CMPconst [0] l:(ANDshiftRA x y [c])) yes no) && l.Uses==1 -> (LT (TSTshiftRA x y [c]) yes no)
-(LT (CMPconst [0] l:(ANDshiftLLreg x y z)) yes no) && l.Uses==1 -> (LT (TSTshiftLLreg x y z) yes no)
-(LT (CMPconst [0] l:(ANDshiftRLreg x y z)) yes no) && l.Uses==1 -> (LT (TSTshiftRLreg x y z) yes no)
-(LT (CMPconst [0] l:(ANDshiftRAreg x y z)) yes no) && l.Uses==1 -> (LT (TSTshiftRAreg x y z) yes no)
-(LE (CMPconst [0] l:(AND x y)) yes no) && l.Uses==1 -> (LE (TST x y) yes no)
-(LE (CMPconst [0] l:(ANDconst [c] x)) yes no) && l.Uses==1 -> (LE (TSTconst [c] x) yes no)
-(LE (CMPconst [0] l:(ANDshiftLL x y [c])) yes no) && l.Uses==1 -> (LE (TSTshiftLL x y [c]) yes no)
-(LE (CMPconst [0] l:(ANDshiftRL x y [c])) yes no) && l.Uses==1 -> (LE (TSTshiftRL x y [c]) yes no)
-(LE (CMPconst [0] l:(ANDshiftRA x y [c])) yes no) && l.Uses==1 -> (LE (TSTshiftRA x y [c]) yes no)
-(LE (CMPconst [0] l:(ANDshiftLLreg x y z)) yes no) && l.Uses==1 -> (LE (TSTshiftLLreg x y z) yes no)
-(LE (CMPconst [0] l:(ANDshiftRLreg x y z)) yes no) && l.Uses==1 -> (LE (TSTshiftRLreg x y z) yes no)
-(LE (CMPconst [0] l:(ANDshiftRAreg x y z)) yes no) && l.Uses==1 -> (LE (TSTshiftRAreg x y z) yes no)
-(LT (CMPconst [0] l:(XOR x y)) yes no) && l.Uses==1 -> (LT (TEQ x y) yes no)
-(LT (CMPconst [0] l:(XORconst [c] x)) yes no) && l.Uses==1 -> (LT (TEQconst [c] x) yes no)
-(LT (CMPconst [0] l:(XORshiftLL x y [c])) yes no) && l.Uses==1 -> (LT (TEQshiftLL x y [c]) yes no)
-(LT (CMPconst [0] l:(XORshiftRL x y [c])) yes no) && l.Uses==1 -> (LT (TEQshiftRL x y [c]) yes no)
-(LT (CMPconst [0] l:(XORshiftRA x y [c])) yes no) && l.Uses==1 -> (LT (TEQshiftRA x y [c]) yes no)
-(LT (CMPconst [0] l:(XORshiftLLreg x y z)) yes no) && l.Uses==1 -> (LT (TEQshiftLLreg x y z) yes no)
-(LT (CMPconst [0] l:(XORshiftRLreg x y z)) yes no) && l.Uses==1 -> (LT (TEQshiftRLreg x y z) yes no)
-(LT (CMPconst [0] l:(XORshiftRAreg x y z)) yes no) && l.Uses==1 -> (LT (TEQshiftRAreg x y z) yes no)
-(LE (CMPconst [0] l:(XOR x y)) yes no) && l.Uses==1 -> (LE (TEQ x y) yes no)
-(LE (CMPconst [0] l:(XORconst [c] x)) yes no) && l.Uses==1  -> (LE (TEQconst [c] x) yes no)
-(LE (CMPconst [0] l:(XORshiftLL x y [c])) yes no) && l.Uses==1 -> (LE (TEQshiftLL x y [c]) yes no)
-(LE (CMPconst [0] l:(XORshiftRL x y [c])) yes no) && l.Uses==1 -> (LE (TEQshiftRL x y [c]) yes no)
-(LE (CMPconst [0] l:(XORshiftRA x y [c])) yes no) && l.Uses==1 -> (LE (TEQshiftRA x y [c]) yes no)
-(LE (CMPconst [0] l:(XORshiftLLreg x y z)) yes no) && l.Uses==1 -> (LE (TEQshiftLLreg x y z) yes no)
-(LE (CMPconst [0] l:(XORshiftRLreg x y z)) yes no) && l.Uses==1 -> (LE (TEQshiftRLreg x y z) yes no)
-(LE (CMPconst [0] l:(XORshiftRAreg x y z)) yes no) && l.Uses==1 -> (LE (TEQshiftRAreg x y z) yes no)
+(LT (CMPconst [0] l:(AND x y)) yes no) && l.Uses==1 -> (LTnoov (TST x y) yes no)
+(LT (CMPconst [0] l:(ANDconst [c] x)) yes no) && l.Uses==1 -> (LTnoov (TSTconst [c] x) yes no)
+(LT (CMPconst [0] l:(ANDshiftLL x y [c])) yes no) && l.Uses==1 -> (LTnoov (TSTshiftLL x y [c]) yes no)
+(LT (CMPconst [0] l:(ANDshiftRL x y [c])) yes no) && l.Uses==1 -> (LTnoov (TSTshiftRL x y [c]) yes no)
+(LT (CMPconst [0] l:(ANDshiftRA x y [c])) yes no) && l.Uses==1 -> (LTnoov (TSTshiftRA x y [c]) yes no)
+(LT (CMPconst [0] l:(ANDshiftLLreg x y z)) yes no) && l.Uses==1 -> (LTnoov (TSTshiftLLreg x y z) yes no)
+(LT (CMPconst [0] l:(ANDshiftRLreg x y z)) yes no) && l.Uses==1 -> (LTnoov (TSTshiftRLreg x y z) yes no)
+(LT (CMPconst [0] l:(ANDshiftRAreg x y z)) yes no) && l.Uses==1 -> (LTnoov (TSTshiftRAreg x y z) yes no)
+(LE (CMPconst [0] l:(AND x y)) yes no) && l.Uses==1 -> (LEnoov (TST x y) yes no)
+(LE (CMPconst [0] l:(ANDconst [c] x)) yes no) && l.Uses==1 -> (LEnoov (TSTconst [c] x) yes no)
+(LE (CMPconst [0] l:(ANDshiftLL x y [c])) yes no) && l.Uses==1 -> (LEnoov (TSTshiftLL x y [c]) yes no)
+(LE (CMPconst [0] l:(ANDshiftRL x y [c])) yes no) && l.Uses==1 -> (LEnoov (TSTshiftRL x y [c]) yes no)
+(LE (CMPconst [0] l:(ANDshiftRA x y [c])) yes no) && l.Uses==1 -> (LEnoov (TSTshiftRA x y [c]) yes no)
+(LE (CMPconst [0] l:(ANDshiftLLreg x y z)) yes no) && l.Uses==1 -> (LEnoov (TSTshiftLLreg x y z) yes no)
+(LE (CMPconst [0] l:(ANDshiftRLreg x y z)) yes no) && l.Uses==1 -> (LEnoov (TSTshiftRLreg x y z) yes no)
+(LE (CMPconst [0] l:(ANDshiftRAreg x y z)) yes no) && l.Uses==1 -> (LEnoov (TSTshiftRAreg x y z) yes no)
+(LT (CMPconst [0] l:(XOR x y)) yes no) && l.Uses==1 -> (LTnoov (TEQ x y) yes no)
+(LT (CMPconst [0] l:(XORconst [c] x)) yes no) && l.Uses==1 -> (LTnoov (TEQconst [c] x) yes no)
+(LT (CMPconst [0] l:(XORshiftLL x y [c])) yes no) && l.Uses==1 -> (LTnoov (TEQshiftLL x y [c]) yes no)
+(LT (CMPconst [0] l:(XORshiftRL x y [c])) yes no) && l.Uses==1 -> (LTnoov (TEQshiftRL x y [c]) yes no)
+(LT (CMPconst [0] l:(XORshiftRA x y [c])) yes no) && l.Uses==1 -> (LTnoov (TEQshiftRA x y [c]) yes no)
+(LT (CMPconst [0] l:(XORshiftLLreg x y z)) yes no) && l.Uses==1 -> (LTnoov (TEQshiftLLreg x y z) yes no)
+(LT (CMPconst [0] l:(XORshiftRLreg x y z)) yes no) && l.Uses==1 -> (LTnoov (TEQshiftRLreg x y z) yes no)
+(LT (CMPconst [0] l:(XORshiftRAreg x y z)) yes no) && l.Uses==1 -> (LTnoov (TEQshiftRAreg x y z) yes no)
+(LE (CMPconst [0] l:(XOR x y)) yes no) && l.Uses==1 -> (LEnoov (TEQ x y) yes no)
+(LE (CMPconst [0] l:(XORconst [c] x)) yes no) && l.Uses==1  -> (LEnoov (TEQconst [c] x) yes no)
+(LE (CMPconst [0] l:(XORshiftLL x y [c])) yes no) && l.Uses==1 -> (LEnoov (TEQshiftLL x y [c]) yes no)
+(LE (CMPconst [0] l:(XORshiftRL x y [c])) yes no) && l.Uses==1 -> (LEnoov (TEQshiftRL x y [c]) yes no)
+(LE (CMPconst [0] l:(XORshiftRA x y [c])) yes no) && l.Uses==1 -> (LEnoov (TEQshiftRA x y [c]) yes no)
+(LE (CMPconst [0] l:(XORshiftLLreg x y z)) yes no) && l.Uses==1 -> (LEnoov (TEQshiftLLreg x y z) yes no)
+(LE (CMPconst [0] l:(XORshiftRLreg x y z)) yes no) && l.Uses==1 -> (LEnoov (TEQshiftRLreg x y z) yes no)
+(LE (CMPconst [0] l:(XORshiftRAreg x y z)) yes no) && l.Uses==1 -> (LEnoov (TEQshiftRAreg x y z) yes no)
 (GT (CMPconst [0] l:(SUB x y)) yes no) && l.Uses==1 -> (GTnoov (CMP x y) yes no)
 (GT (CMPconst [0] l:(MULS x y a)) yes no) && l.Uses==1 -> (GTnoov (CMP a (MUL <x.Type> x y)) yes no)
 (GT (CMPconst [0] l:(SUBconst [c] x)) yes no) && l.Uses==1 -> (GTnoov (CMPconst [c] x) yes no)
@@ -1436,39 +1436,39 @@
 (GE (CMPconst [0] l:(ADDshiftLLreg x y z)) yes no) && l.Uses==1 -> (GEnoov (CMNshiftLLreg x y z) yes no)
 (GE (CMPconst [0] l:(ADDshiftRLreg x y z)) yes no) && l.Uses==1 -> (GEnoov (CMNshiftRLreg x y z) yes no)
 (GE (CMPconst [0] l:(ADDshiftRAreg x y z)) yes no) && l.Uses==1 -> (GEnoov (CMNshiftRAreg x y z) yes no)
-(GT (CMPconst [0] l:(AND x y)) yes no) && l.Uses==1 -> (GT (TST x y) yes no)
 (GT (CMPconst [0] l:(MULA x y a)) yes no) && l.Uses==1 -> (GTnoov (CMN a (MUL <x.Type> x y)) yes no)
-(GT (CMPconst [0] l:(ANDconst [c] x)) yes no) && l.Uses==1 -> (GT (TSTconst [c] x) yes no)
-(GT (CMPconst [0] l:(ANDshiftLL x y [c])) yes no) && l.Uses==1 -> (GT (TSTshiftLL x y [c]) yes no)
-(GT (CMPconst [0] l:(ANDshiftRL x y [c])) yes no) && l.Uses==1 -> (GT (TSTshiftRL x y [c]) yes no)
-(GT (CMPconst [0] l:(ANDshiftRA x y [c])) yes no) && l.Uses==1 -> (GT (TSTshiftRA x y [c]) yes no)
-(GT (CMPconst [0] l:(ANDshiftLLreg x y z)) yes no) && l.Uses==1 -> (GT (TSTshiftLLreg x y z) yes no)
-(GT (CMPconst [0] l:(ANDshiftRLreg x y z)) yes no) && l.Uses==1 -> (GT (TSTshiftRLreg x y z) yes no)
-(GT (CMPconst [0] l:(ANDshiftRAreg x y z)) yes no) && l.Uses==1 -> (GT (TSTshiftRAreg x y z) yes no)
-(GE (CMPconst [0] l:(AND x y)) yes no) && l.Uses==1 -> (GE (TST x y) yes no)
-(GE (CMPconst [0] l:(ANDconst [c] x)) yes no) && l.Uses==1 -> (GE (TSTconst [c] x) yes no)
-(GE (CMPconst [0] l:(ANDshiftLL x y [c])) yes no) && l.Uses==1 -> (GE (TSTshiftLL x y [c]) yes no)
-(GE (CMPconst [0] l:(ANDshiftRL x y [c])) yes no) && l.Uses==1 -> (GE (TSTshiftRL x y [c]) yes no)
-(GE (CMPconst [0] l:(ANDshiftRA x y [c])) yes no) && l.Uses==1 -> (GE (TSTshiftRA x y [c]) yes no)
-(GE (CMPconst [0] l:(ANDshiftLLreg x y z)) yes no) && l.Uses==1 -> (GE (TSTshiftLLreg x y z) yes no)
-(GE (CMPconst [0] l:(ANDshiftRLreg x y z)) yes no) && l.Uses==1 -> (GE (TSTshiftRLreg x y z) yes no)
-(GE (CMPconst [0] l:(ANDshiftRAreg x y z)) yes no) && l.Uses==1 -> (GE (TSTshiftRAreg x y z) yes no)
-(GT (CMPconst [0] l:(XOR x y)) yes no) && l.Uses==1 -> (GT (TEQ x y) yes no)
-(GT (CMPconst [0] l:(XORconst [c] x)) yes no) && l.Uses==1 -> (GT (TEQconst [c] x) yes no)
-(GT (CMPconst [0] l:(XORshiftLL x y [c])) yes no) && l.Uses==1 -> (GT (TEQshiftLL x y [c]) yes no)
-(GT (CMPconst [0] l:(XORshiftRL x y [c])) yes no) && l.Uses==1 -> (GT (TEQshiftRL x y [c]) yes no)
-(GT (CMPconst [0] l:(XORshiftRA x y [c])) yes no) && l.Uses==1 -> (GT (TEQshiftRA x y [c]) yes no)
-(GT (CMPconst [0] l:(XORshiftLLreg x y z)) yes no) && l.Uses==1 -> (GT (TEQshiftLLreg x y z) yes no)
-(GT (CMPconst [0] l:(XORshiftRLreg x y z)) yes no) && l.Uses==1 -> (GT (TEQshiftRLreg x y z) yes no)
-(GT (CMPconst [0] l:(XORshiftRAreg x y z)) yes no) && l.Uses==1 -> (GT (TEQshiftRAreg x y z) yes no)
-(GE (CMPconst [0] l:(XOR x y)) yes no) && l.Uses==1 -> (GE (TEQ x y) yes no)
-(GE (CMPconst [0] l:(XORconst [c] x)) yes no) && l.Uses==1 -> (GE (TEQconst [c] x) yes no)
-(GE (CMPconst [0] l:(XORshiftLL x y [c])) yes no) && l.Uses==1 -> (GE (TEQshiftLL x y [c]) yes no)
-(GE (CMPconst [0] l:(XORshiftRL x y [c])) yes no) && l.Uses==1 -> (GE (TEQshiftRL x y [c]) yes no)
-(GE (CMPconst [0] l:(XORshiftRA x y [c])) yes no) && l.Uses==1 -> (GE (TEQshiftRA x y [c]) yes no)
-(GE (CMPconst [0] l:(XORshiftLLreg x y z)) yes no) && l.Uses==1 -> (GE (TEQshiftLLreg x y z) yes no)
-(GE (CMPconst [0] l:(XORshiftRLreg x y z)) yes no) && l.Uses==1 -> (GE (TEQshiftRLreg x y z) yes no)
-(GE (CMPconst [0] l:(XORshiftRAreg x y z)) yes no) && l.Uses==1 -> (GE (TEQshiftRAreg x y z) yes no)
+(GT (CMPconst [0] l:(AND x y)) yes no) && l.Uses==1 -> (GTnoov (TST x y) yes no)
+(GT (CMPconst [0] l:(ANDconst [c] x)) yes no) && l.Uses==1 -> (GTnoov (TSTconst [c] x) yes no)
+(GT (CMPconst [0] l:(ANDshiftLL x y [c])) yes no) && l.Uses==1 -> (GTnoov (TSTshiftLL x y [c]) yes no)
+(GT (CMPconst [0] l:(ANDshiftRL x y [c])) yes no) && l.Uses==1 -> (GTnoov (TSTshiftRL x y [c]) yes no)
+(GT (CMPconst [0] l:(ANDshiftRA x y [c])) yes no) && l.Uses==1 -> (GTnoov (TSTshiftRA x y [c]) yes no)
+(GT (CMPconst [0] l:(ANDshiftLLreg x y z)) yes no) && l.Uses==1 -> (GTnoov (TSTshiftLLreg x y z) yes no)
+(GT (CMPconst [0] l:(ANDshiftRLreg x y z)) yes no) && l.Uses==1 -> (GTnoov (TSTshiftRLreg x y z) yes no)
+(GT (CMPconst [0] l:(ANDshiftRAreg x y z)) yes no) && l.Uses==1 -> (GTnoov (TSTshiftRAreg x y z) yes no)
+(GE (CMPconst [0] l:(AND x y)) yes no) && l.Uses==1 -> (GEnoov (TST x y) yes no)
+(GE (CMPconst [0] l:(ANDconst [c] x)) yes no) && l.Uses==1 -> (GEnoov (TSTconst [c] x) yes no)
+(GE (CMPconst [0] l:(ANDshiftLL x y [c])) yes no) && l.Uses==1 -> (GEnoov (TSTshiftLL x y [c]) yes no)
+(GE (CMPconst [0] l:(ANDshiftRL x y [c])) yes no) && l.Uses==1 -> (GEnoov (TSTshiftRL x y [c]) yes no)
+(GE (CMPconst [0] l:(ANDshiftRA x y [c])) yes no) && l.Uses==1 -> (GEnoov (TSTshiftRA x y [c]) yes no)
+(GE (CMPconst [0] l:(ANDshiftLLreg x y z)) yes no) && l.Uses==1 -> (GEnoov (TSTshiftLLreg x y z) yes no)
+(GE (CMPconst [0] l:(ANDshiftRLreg x y z)) yes no) && l.Uses==1 -> (GEnoov (TSTshiftRLreg x y z) yes no)
+(GE (CMPconst [0] l:(ANDshiftRAreg x y z)) yes no) && l.Uses==1 -> (GEnoov (TSTshiftRAreg x y z) yes no)
+(GT (CMPconst [0] l:(XOR x y)) yes no) && l.Uses==1 -> (GTnoov (TEQ x y) yes no)
+(GT (CMPconst [0] l:(XORconst [c] x)) yes no) && l.Uses==1 -> (GTnoov (TEQconst [c] x) yes no)
+(GT (CMPconst [0] l:(XORshiftLL x y [c])) yes no) && l.Uses==1 -> (GTnoov (TEQshiftLL x y [c]) yes no)
+(GT (CMPconst [0] l:(XORshiftRL x y [c])) yes no) && l.Uses==1 -> (GTnoov (TEQshiftRL x y [c]) yes no)
+(GT (CMPconst [0] l:(XORshiftRA x y [c])) yes no) && l.Uses==1 -> (GTnoov (TEQshiftRA x y [c]) yes no)
+(GT (CMPconst [0] l:(XORshiftLLreg x y z)) yes no) && l.Uses==1 -> (GTnoov (TEQshiftLLreg x y z) yes no)
+(GT (CMPconst [0] l:(XORshiftRLreg x y z)) yes no) && l.Uses==1 -> (GTnoov (TEQshiftRLreg x y z) yes no)
+(GT (CMPconst [0] l:(XORshiftRAreg x y z)) yes no) && l.Uses==1 -> (GTnoov (TEQshiftRAreg x y z) yes no)
+(GE (CMPconst [0] l:(XOR x y)) yes no) && l.Uses==1 -> (GEnoov (TEQ x y) yes no)
+(GE (CMPconst [0] l:(XORconst [c] x)) yes no) && l.Uses==1 -> (GEnoov (TEQconst [c] x) yes no)
+(GE (CMPconst [0] l:(XORshiftLL x y [c])) yes no) && l.Uses==1 -> (GEnoov (TEQshiftLL x y [c]) yes no)
+(GE (CMPconst [0] l:(XORshiftRL x y [c])) yes no) && l.Uses==1 -> (GEnoov (TEQshiftRL x y [c]) yes no)
+(GE (CMPconst [0] l:(XORshiftRA x y [c])) yes no) && l.Uses==1 -> (GEnoov (TEQshiftRA x y [c]) yes no)
+(GE (CMPconst [0] l:(XORshiftLLreg x y z)) yes no) && l.Uses==1 -> (GEnoov (TEQshiftLLreg x y z) yes no)
+(GE (CMPconst [0] l:(XORshiftRLreg x y z)) yes no) && l.Uses==1 -> (GEnoov (TEQshiftRLreg x y z) yes no)
+(GE (CMPconst [0] l:(XORshiftRAreg x y z)) yes no) && l.Uses==1 -> (GEnoov (TEQshiftRAreg x y z) yes no)
 
 (MOVBUload [off] {sym} (SB) _) && symIsRO(sym) -> (MOVWconst [int64(read8(sym, off))])
 (MOVHUload [off] {sym} (SB) _) && symIsRO(sym) -> (MOVWconst [int64(read16(sym, off, config.ctxt.Arch.ByteOrder))])
diff --git a/src/cmd/compile/internal/ssa/rewriteARM.go b/src/cmd/compile/internal/ssa/rewriteARM.go
index f55e5425055..07653b78f8a 100644
--- a/src/cmd/compile/internal/ssa/rewriteARM.go
+++ b/src/cmd/compile/internal/ssa/rewriteARM.go
@@ -17278,7 +17278,7 @@ func rewriteBlockARM(b *Block) bool {
 		}
 		// match: (GE (CMPconst [0] l:(AND x y)) yes no)
 		// cond: l.Uses==1
-		// result: (GE (TST x y) yes no)
+		// result: (GEnoov (TST x y) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -17299,14 +17299,14 @@ func rewriteBlockARM(b *Block) bool {
 				}
 				v0 := b.NewValue0(v_0.Pos, OpARMTST, types.TypeFlags)
 				v0.AddArg2(x, y)
-				b.resetWithControl(BlockARMGE, v0)
+				b.resetWithControl(BlockARMGEnoov, v0)
 				return true
 			}
 			break
 		}
 		// match: (GE (CMPconst [0] l:(ANDconst [c] x)) yes no)
 		// cond: l.Uses==1
-		// result: (GE (TSTconst [c] x) yes no)
+		// result: (GEnoov (TSTconst [c] x) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -17324,12 +17324,12 @@ func rewriteBlockARM(b *Block) bool {
 			v0 := b.NewValue0(v_0.Pos, OpARMTSTconst, types.TypeFlags)
 			v0.AuxInt = c
 			v0.AddArg(x)
-			b.resetWithControl(BlockARMGE, v0)
+			b.resetWithControl(BlockARMGEnoov, v0)
 			return true
 		}
 		// match: (GE (CMPconst [0] l:(ANDshiftLL x y [c])) yes no)
 		// cond: l.Uses==1
-		// result: (GE (TSTshiftLL x y [c]) yes no)
+		// result: (GEnoov (TSTshiftLL x y [c]) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -17348,12 +17348,12 @@ func rewriteBlockARM(b *Block) bool {
 			v0 := b.NewValue0(v_0.Pos, OpARMTSTshiftLL, types.TypeFlags)
 			v0.AuxInt = c
 			v0.AddArg2(x, y)
-			b.resetWithControl(BlockARMGE, v0)
+			b.resetWithControl(BlockARMGEnoov, v0)
 			return true
 		}
 		// match: (GE (CMPconst [0] l:(ANDshiftRL x y [c])) yes no)
 		// cond: l.Uses==1
-		// result: (GE (TSTshiftRL x y [c]) yes no)
+		// result: (GEnoov (TSTshiftRL x y [c]) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -17372,12 +17372,12 @@ func rewriteBlockARM(b *Block) bool {
 			v0 := b.NewValue0(v_0.Pos, OpARMTSTshiftRL, types.TypeFlags)
 			v0.AuxInt = c
 			v0.AddArg2(x, y)
-			b.resetWithControl(BlockARMGE, v0)
+			b.resetWithControl(BlockARMGEnoov, v0)
 			return true
 		}
 		// match: (GE (CMPconst [0] l:(ANDshiftRA x y [c])) yes no)
 		// cond: l.Uses==1
-		// result: (GE (TSTshiftRA x y [c]) yes no)
+		// result: (GEnoov (TSTshiftRA x y [c]) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -17396,12 +17396,12 @@ func rewriteBlockARM(b *Block) bool {
 			v0 := b.NewValue0(v_0.Pos, OpARMTSTshiftRA, types.TypeFlags)
 			v0.AuxInt = c
 			v0.AddArg2(x, y)
-			b.resetWithControl(BlockARMGE, v0)
+			b.resetWithControl(BlockARMGEnoov, v0)
 			return true
 		}
 		// match: (GE (CMPconst [0] l:(ANDshiftLLreg x y z)) yes no)
 		// cond: l.Uses==1
-		// result: (GE (TSTshiftLLreg x y z) yes no)
+		// result: (GEnoov (TSTshiftLLreg x y z) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -17419,12 +17419,12 @@ func rewriteBlockARM(b *Block) bool {
 			}
 			v0 := b.NewValue0(v_0.Pos, OpARMTSTshiftLLreg, types.TypeFlags)
 			v0.AddArg3(x, y, z)
-			b.resetWithControl(BlockARMGE, v0)
+			b.resetWithControl(BlockARMGEnoov, v0)
 			return true
 		}
 		// match: (GE (CMPconst [0] l:(ANDshiftRLreg x y z)) yes no)
 		// cond: l.Uses==1
-		// result: (GE (TSTshiftRLreg x y z) yes no)
+		// result: (GEnoov (TSTshiftRLreg x y z) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -17442,12 +17442,12 @@ func rewriteBlockARM(b *Block) bool {
 			}
 			v0 := b.NewValue0(v_0.Pos, OpARMTSTshiftRLreg, types.TypeFlags)
 			v0.AddArg3(x, y, z)
-			b.resetWithControl(BlockARMGE, v0)
+			b.resetWithControl(BlockARMGEnoov, v0)
 			return true
 		}
 		// match: (GE (CMPconst [0] l:(ANDshiftRAreg x y z)) yes no)
 		// cond: l.Uses==1
-		// result: (GE (TSTshiftRAreg x y z) yes no)
+		// result: (GEnoov (TSTshiftRAreg x y z) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -17465,12 +17465,12 @@ func rewriteBlockARM(b *Block) bool {
 			}
 			v0 := b.NewValue0(v_0.Pos, OpARMTSTshiftRAreg, types.TypeFlags)
 			v0.AddArg3(x, y, z)
-			b.resetWithControl(BlockARMGE, v0)
+			b.resetWithControl(BlockARMGEnoov, v0)
 			return true
 		}
 		// match: (GE (CMPconst [0] l:(XOR x y)) yes no)
 		// cond: l.Uses==1
-		// result: (GE (TEQ x y) yes no)
+		// result: (GEnoov (TEQ x y) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -17491,14 +17491,14 @@ func rewriteBlockARM(b *Block) bool {
 				}
 				v0 := b.NewValue0(v_0.Pos, OpARMTEQ, types.TypeFlags)
 				v0.AddArg2(x, y)
-				b.resetWithControl(BlockARMGE, v0)
+				b.resetWithControl(BlockARMGEnoov, v0)
 				return true
 			}
 			break
 		}
 		// match: (GE (CMPconst [0] l:(XORconst [c] x)) yes no)
 		// cond: l.Uses==1
-		// result: (GE (TEQconst [c] x) yes no)
+		// result: (GEnoov (TEQconst [c] x) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -17516,12 +17516,12 @@ func rewriteBlockARM(b *Block) bool {
 			v0 := b.NewValue0(v_0.Pos, OpARMTEQconst, types.TypeFlags)
 			v0.AuxInt = c
 			v0.AddArg(x)
-			b.resetWithControl(BlockARMGE, v0)
+			b.resetWithControl(BlockARMGEnoov, v0)
 			return true
 		}
 		// match: (GE (CMPconst [0] l:(XORshiftLL x y [c])) yes no)
 		// cond: l.Uses==1
-		// result: (GE (TEQshiftLL x y [c]) yes no)
+		// result: (GEnoov (TEQshiftLL x y [c]) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -17540,12 +17540,12 @@ func rewriteBlockARM(b *Block) bool {
 			v0 := b.NewValue0(v_0.Pos, OpARMTEQshiftLL, types.TypeFlags)
 			v0.AuxInt = c
 			v0.AddArg2(x, y)
-			b.resetWithControl(BlockARMGE, v0)
+			b.resetWithControl(BlockARMGEnoov, v0)
 			return true
 		}
 		// match: (GE (CMPconst [0] l:(XORshiftRL x y [c])) yes no)
 		// cond: l.Uses==1
-		// result: (GE (TEQshiftRL x y [c]) yes no)
+		// result: (GEnoov (TEQshiftRL x y [c]) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -17564,12 +17564,12 @@ func rewriteBlockARM(b *Block) bool {
 			v0 := b.NewValue0(v_0.Pos, OpARMTEQshiftRL, types.TypeFlags)
 			v0.AuxInt = c
 			v0.AddArg2(x, y)
-			b.resetWithControl(BlockARMGE, v0)
+			b.resetWithControl(BlockARMGEnoov, v0)
 			return true
 		}
 		// match: (GE (CMPconst [0] l:(XORshiftRA x y [c])) yes no)
 		// cond: l.Uses==1
-		// result: (GE (TEQshiftRA x y [c]) yes no)
+		// result: (GEnoov (TEQshiftRA x y [c]) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -17588,12 +17588,12 @@ func rewriteBlockARM(b *Block) bool {
 			v0 := b.NewValue0(v_0.Pos, OpARMTEQshiftRA, types.TypeFlags)
 			v0.AuxInt = c
 			v0.AddArg2(x, y)
-			b.resetWithControl(BlockARMGE, v0)
+			b.resetWithControl(BlockARMGEnoov, v0)
 			return true
 		}
 		// match: (GE (CMPconst [0] l:(XORshiftLLreg x y z)) yes no)
 		// cond: l.Uses==1
-		// result: (GE (TEQshiftLLreg x y z) yes no)
+		// result: (GEnoov (TEQshiftLLreg x y z) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -17611,12 +17611,12 @@ func rewriteBlockARM(b *Block) bool {
 			}
 			v0 := b.NewValue0(v_0.Pos, OpARMTEQshiftLLreg, types.TypeFlags)
 			v0.AddArg3(x, y, z)
-			b.resetWithControl(BlockARMGE, v0)
+			b.resetWithControl(BlockARMGEnoov, v0)
 			return true
 		}
 		// match: (GE (CMPconst [0] l:(XORshiftRLreg x y z)) yes no)
 		// cond: l.Uses==1
-		// result: (GE (TEQshiftRLreg x y z) yes no)
+		// result: (GEnoov (TEQshiftRLreg x y z) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -17634,12 +17634,12 @@ func rewriteBlockARM(b *Block) bool {
 			}
 			v0 := b.NewValue0(v_0.Pos, OpARMTEQshiftRLreg, types.TypeFlags)
 			v0.AddArg3(x, y, z)
-			b.resetWithControl(BlockARMGE, v0)
+			b.resetWithControl(BlockARMGEnoov, v0)
 			return true
 		}
 		// match: (GE (CMPconst [0] l:(XORshiftRAreg x y z)) yes no)
 		// cond: l.Uses==1
-		// result: (GE (TEQshiftRAreg x y z) yes no)
+		// result: (GEnoov (TEQshiftRAreg x y z) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -17657,7 +17657,7 @@ func rewriteBlockARM(b *Block) bool {
 			}
 			v0 := b.NewValue0(v_0.Pos, OpARMTEQshiftRAreg, types.TypeFlags)
 			v0.AddArg3(x, y, z)
-			b.resetWithControl(BlockARMGE, v0)
+			b.resetWithControl(BlockARMGEnoov, v0)
 			return true
 		}
 	case BlockARMGEnoov:
@@ -18131,9 +18131,34 @@ func rewriteBlockARM(b *Block) bool {
 			b.resetWithControl(BlockARMGTnoov, v0)
 			return true
 		}
+		// match: (GT (CMPconst [0] l:(MULA x y a)) yes no)
+		// cond: l.Uses==1
+		// result: (GTnoov (CMN a (MUL <x.Type> x y)) yes no)
+		for b.Controls[0].Op == OpARMCMPconst {
+			v_0 := b.Controls[0]
+			if v_0.AuxInt != 0 {
+				break
+			}
+			l := v_0.Args[0]
+			if l.Op != OpARMMULA {
+				break
+			}
+			a := l.Args[2]
+			x := l.Args[0]
+			y := l.Args[1]
+			if !(l.Uses == 1) {
+				break
+			}
+			v0 := b.NewValue0(v_0.Pos, OpARMCMN, types.TypeFlags)
+			v1 := b.NewValue0(v_0.Pos, OpARMMUL, x.Type)
+			v1.AddArg2(x, y)
+			v0.AddArg2(a, v1)
+			b.resetWithControl(BlockARMGTnoov, v0)
+			return true
+		}
 		// match: (GT (CMPconst [0] l:(AND x y)) yes no)
 		// cond: l.Uses==1
-		// result: (GT (TST x y) yes no)
+		// result: (GTnoov (TST x y) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -18154,39 +18179,14 @@ func rewriteBlockARM(b *Block) bool {
 				}
 				v0 := b.NewValue0(v_0.Pos, OpARMTST, types.TypeFlags)
 				v0.AddArg2(x, y)
-				b.resetWithControl(BlockARMGT, v0)
+				b.resetWithControl(BlockARMGTnoov, v0)
 				return true
 			}
 			break
 		}
-		// match: (GT (CMPconst [0] l:(MULA x y a)) yes no)
-		// cond: l.Uses==1
-		// result: (GTnoov (CMN a (MUL <x.Type> x y)) yes no)
-		for b.Controls[0].Op == OpARMCMPconst {
-			v_0 := b.Controls[0]
-			if v_0.AuxInt != 0 {
-				break
-			}
-			l := v_0.Args[0]
-			if l.Op != OpARMMULA {
-				break
-			}
-			a := l.Args[2]
-			x := l.Args[0]
-			y := l.Args[1]
-			if !(l.Uses == 1) {
-				break
-			}
-			v0 := b.NewValue0(v_0.Pos, OpARMCMN, types.TypeFlags)
-			v1 := b.NewValue0(v_0.Pos, OpARMMUL, x.Type)
-			v1.AddArg2(x, y)
-			v0.AddArg2(a, v1)
-			b.resetWithControl(BlockARMGTnoov, v0)
-			return true
-		}
 		// match: (GT (CMPconst [0] l:(ANDconst [c] x)) yes no)
 		// cond: l.Uses==1
-		// result: (GT (TSTconst [c] x) yes no)
+		// result: (GTnoov (TSTconst [c] x) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -18204,12 +18204,12 @@ func rewriteBlockARM(b *Block) bool {
 			v0 := b.NewValue0(v_0.Pos, OpARMTSTconst, types.TypeFlags)
 			v0.AuxInt = c
 			v0.AddArg(x)
-			b.resetWithControl(BlockARMGT, v0)
+			b.resetWithControl(BlockARMGTnoov, v0)
 			return true
 		}
 		// match: (GT (CMPconst [0] l:(ANDshiftLL x y [c])) yes no)
 		// cond: l.Uses==1
-		// result: (GT (TSTshiftLL x y [c]) yes no)
+		// result: (GTnoov (TSTshiftLL x y [c]) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -18228,12 +18228,12 @@ func rewriteBlockARM(b *Block) bool {
 			v0 := b.NewValue0(v_0.Pos, OpARMTSTshiftLL, types.TypeFlags)
 			v0.AuxInt = c
 			v0.AddArg2(x, y)
-			b.resetWithControl(BlockARMGT, v0)
+			b.resetWithControl(BlockARMGTnoov, v0)
 			return true
 		}
 		// match: (GT (CMPconst [0] l:(ANDshiftRL x y [c])) yes no)
 		// cond: l.Uses==1
-		// result: (GT (TSTshiftRL x y [c]) yes no)
+		// result: (GTnoov (TSTshiftRL x y [c]) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -18252,12 +18252,12 @@ func rewriteBlockARM(b *Block) bool {
 			v0 := b.NewValue0(v_0.Pos, OpARMTSTshiftRL, types.TypeFlags)
 			v0.AuxInt = c
 			v0.AddArg2(x, y)
-			b.resetWithControl(BlockARMGT, v0)
+			b.resetWithControl(BlockARMGTnoov, v0)
 			return true
 		}
 		// match: (GT (CMPconst [0] l:(ANDshiftRA x y [c])) yes no)
 		// cond: l.Uses==1
-		// result: (GT (TSTshiftRA x y [c]) yes no)
+		// result: (GTnoov (TSTshiftRA x y [c]) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -18276,12 +18276,12 @@ func rewriteBlockARM(b *Block) bool {
 			v0 := b.NewValue0(v_0.Pos, OpARMTSTshiftRA, types.TypeFlags)
 			v0.AuxInt = c
 			v0.AddArg2(x, y)
-			b.resetWithControl(BlockARMGT, v0)
+			b.resetWithControl(BlockARMGTnoov, v0)
 			return true
 		}
 		// match: (GT (CMPconst [0] l:(ANDshiftLLreg x y z)) yes no)
 		// cond: l.Uses==1
-		// result: (GT (TSTshiftLLreg x y z) yes no)
+		// result: (GTnoov (TSTshiftLLreg x y z) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -18299,12 +18299,12 @@ func rewriteBlockARM(b *Block) bool {
 			}
 			v0 := b.NewValue0(v_0.Pos, OpARMTSTshiftLLreg, types.TypeFlags)
 			v0.AddArg3(x, y, z)
-			b.resetWithControl(BlockARMGT, v0)
+			b.resetWithControl(BlockARMGTnoov, v0)
 			return true
 		}
 		// match: (GT (CMPconst [0] l:(ANDshiftRLreg x y z)) yes no)
 		// cond: l.Uses==1
-		// result: (GT (TSTshiftRLreg x y z) yes no)
+		// result: (GTnoov (TSTshiftRLreg x y z) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -18322,12 +18322,12 @@ func rewriteBlockARM(b *Block) bool {
 			}
 			v0 := b.NewValue0(v_0.Pos, OpARMTSTshiftRLreg, types.TypeFlags)
 			v0.AddArg3(x, y, z)
-			b.resetWithControl(BlockARMGT, v0)
+			b.resetWithControl(BlockARMGTnoov, v0)
 			return true
 		}
 		// match: (GT (CMPconst [0] l:(ANDshiftRAreg x y z)) yes no)
 		// cond: l.Uses==1
-		// result: (GT (TSTshiftRAreg x y z) yes no)
+		// result: (GTnoov (TSTshiftRAreg x y z) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -18345,12 +18345,12 @@ func rewriteBlockARM(b *Block) bool {
 			}
 			v0 := b.NewValue0(v_0.Pos, OpARMTSTshiftRAreg, types.TypeFlags)
 			v0.AddArg3(x, y, z)
-			b.resetWithControl(BlockARMGT, v0)
+			b.resetWithControl(BlockARMGTnoov, v0)
 			return true
 		}
 		// match: (GT (CMPconst [0] l:(XOR x y)) yes no)
 		// cond: l.Uses==1
-		// result: (GT (TEQ x y) yes no)
+		// result: (GTnoov (TEQ x y) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -18371,14 +18371,14 @@ func rewriteBlockARM(b *Block) bool {
 				}
 				v0 := b.NewValue0(v_0.Pos, OpARMTEQ, types.TypeFlags)
 				v0.AddArg2(x, y)
-				b.resetWithControl(BlockARMGT, v0)
+				b.resetWithControl(BlockARMGTnoov, v0)
 				return true
 			}
 			break
 		}
 		// match: (GT (CMPconst [0] l:(XORconst [c] x)) yes no)
 		// cond: l.Uses==1
-		// result: (GT (TEQconst [c] x) yes no)
+		// result: (GTnoov (TEQconst [c] x) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -18396,12 +18396,12 @@ func rewriteBlockARM(b *Block) bool {
 			v0 := b.NewValue0(v_0.Pos, OpARMTEQconst, types.TypeFlags)
 			v0.AuxInt = c
 			v0.AddArg(x)
-			b.resetWithControl(BlockARMGT, v0)
+			b.resetWithControl(BlockARMGTnoov, v0)
 			return true
 		}
 		// match: (GT (CMPconst [0] l:(XORshiftLL x y [c])) yes no)
 		// cond: l.Uses==1
-		// result: (GT (TEQshiftLL x y [c]) yes no)
+		// result: (GTnoov (TEQshiftLL x y [c]) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -18420,12 +18420,12 @@ func rewriteBlockARM(b *Block) bool {
 			v0 := b.NewValue0(v_0.Pos, OpARMTEQshiftLL, types.TypeFlags)
 			v0.AuxInt = c
 			v0.AddArg2(x, y)
-			b.resetWithControl(BlockARMGT, v0)
+			b.resetWithControl(BlockARMGTnoov, v0)
 			return true
 		}
 		// match: (GT (CMPconst [0] l:(XORshiftRL x y [c])) yes no)
 		// cond: l.Uses==1
-		// result: (GT (TEQshiftRL x y [c]) yes no)
+		// result: (GTnoov (TEQshiftRL x y [c]) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -18444,12 +18444,12 @@ func rewriteBlockARM(b *Block) bool {
 			v0 := b.NewValue0(v_0.Pos, OpARMTEQshiftRL, types.TypeFlags)
 			v0.AuxInt = c
 			v0.AddArg2(x, y)
-			b.resetWithControl(BlockARMGT, v0)
+			b.resetWithControl(BlockARMGTnoov, v0)
 			return true
 		}
 		// match: (GT (CMPconst [0] l:(XORshiftRA x y [c])) yes no)
 		// cond: l.Uses==1
-		// result: (GT (TEQshiftRA x y [c]) yes no)
+		// result: (GTnoov (TEQshiftRA x y [c]) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -18468,12 +18468,12 @@ func rewriteBlockARM(b *Block) bool {
 			v0 := b.NewValue0(v_0.Pos, OpARMTEQshiftRA, types.TypeFlags)
 			v0.AuxInt = c
 			v0.AddArg2(x, y)
-			b.resetWithControl(BlockARMGT, v0)
+			b.resetWithControl(BlockARMGTnoov, v0)
 			return true
 		}
 		// match: (GT (CMPconst [0] l:(XORshiftLLreg x y z)) yes no)
 		// cond: l.Uses==1
-		// result: (GT (TEQshiftLLreg x y z) yes no)
+		// result: (GTnoov (TEQshiftLLreg x y z) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -18491,12 +18491,12 @@ func rewriteBlockARM(b *Block) bool {
 			}
 			v0 := b.NewValue0(v_0.Pos, OpARMTEQshiftLLreg, types.TypeFlags)
 			v0.AddArg3(x, y, z)
-			b.resetWithControl(BlockARMGT, v0)
+			b.resetWithControl(BlockARMGTnoov, v0)
 			return true
 		}
 		// match: (GT (CMPconst [0] l:(XORshiftRLreg x y z)) yes no)
 		// cond: l.Uses==1
-		// result: (GT (TEQshiftRLreg x y z) yes no)
+		// result: (GTnoov (TEQshiftRLreg x y z) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -18514,12 +18514,12 @@ func rewriteBlockARM(b *Block) bool {
 			}
 			v0 := b.NewValue0(v_0.Pos, OpARMTEQshiftRLreg, types.TypeFlags)
 			v0.AddArg3(x, y, z)
-			b.resetWithControl(BlockARMGT, v0)
+			b.resetWithControl(BlockARMGTnoov, v0)
 			return true
 		}
 		// match: (GT (CMPconst [0] l:(XORshiftRAreg x y z)) yes no)
 		// cond: l.Uses==1
-		// result: (GT (TEQshiftRAreg x y z) yes no)
+		// result: (GTnoov (TEQshiftRAreg x y z) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -18537,7 +18537,7 @@ func rewriteBlockARM(b *Block) bool {
 			}
 			v0 := b.NewValue0(v_0.Pos, OpARMTEQshiftRAreg, types.TypeFlags)
 			v0.AddArg3(x, y, z)
-			b.resetWithControl(BlockARMGT, v0)
+			b.resetWithControl(BlockARMGTnoov, v0)
 			return true
 		}
 	case BlockARMGTnoov:
@@ -19129,7 +19129,7 @@ func rewriteBlockARM(b *Block) bool {
 		}
 		// match: (LE (CMPconst [0] l:(AND x y)) yes no)
 		// cond: l.Uses==1
-		// result: (LE (TST x y) yes no)
+		// result: (LEnoov (TST x y) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -19150,14 +19150,14 @@ func rewriteBlockARM(b *Block) bool {
 				}
 				v0 := b.NewValue0(v_0.Pos, OpARMTST, types.TypeFlags)
 				v0.AddArg2(x, y)
-				b.resetWithControl(BlockARMLE, v0)
+				b.resetWithControl(BlockARMLEnoov, v0)
 				return true
 			}
 			break
 		}
 		// match: (LE (CMPconst [0] l:(ANDconst [c] x)) yes no)
 		// cond: l.Uses==1
-		// result: (LE (TSTconst [c] x) yes no)
+		// result: (LEnoov (TSTconst [c] x) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -19175,12 +19175,12 @@ func rewriteBlockARM(b *Block) bool {
 			v0 := b.NewValue0(v_0.Pos, OpARMTSTconst, types.TypeFlags)
 			v0.AuxInt = c
 			v0.AddArg(x)
-			b.resetWithControl(BlockARMLE, v0)
+			b.resetWithControl(BlockARMLEnoov, v0)
 			return true
 		}
 		// match: (LE (CMPconst [0] l:(ANDshiftLL x y [c])) yes no)
 		// cond: l.Uses==1
-		// result: (LE (TSTshiftLL x y [c]) yes no)
+		// result: (LEnoov (TSTshiftLL x y [c]) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -19199,12 +19199,12 @@ func rewriteBlockARM(b *Block) bool {
 			v0 := b.NewValue0(v_0.Pos, OpARMTSTshiftLL, types.TypeFlags)
 			v0.AuxInt = c
 			v0.AddArg2(x, y)
-			b.resetWithControl(BlockARMLE, v0)
+			b.resetWithControl(BlockARMLEnoov, v0)
 			return true
 		}
 		// match: (LE (CMPconst [0] l:(ANDshiftRL x y [c])) yes no)
 		// cond: l.Uses==1
-		// result: (LE (TSTshiftRL x y [c]) yes no)
+		// result: (LEnoov (TSTshiftRL x y [c]) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -19223,12 +19223,12 @@ func rewriteBlockARM(b *Block) bool {
 			v0 := b.NewValue0(v_0.Pos, OpARMTSTshiftRL, types.TypeFlags)
 			v0.AuxInt = c
 			v0.AddArg2(x, y)
-			b.resetWithControl(BlockARMLE, v0)
+			b.resetWithControl(BlockARMLEnoov, v0)
 			return true
 		}
 		// match: (LE (CMPconst [0] l:(ANDshiftRA x y [c])) yes no)
 		// cond: l.Uses==1
-		// result: (LE (TSTshiftRA x y [c]) yes no)
+		// result: (LEnoov (TSTshiftRA x y [c]) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -19247,12 +19247,12 @@ func rewriteBlockARM(b *Block) bool {
 			v0 := b.NewValue0(v_0.Pos, OpARMTSTshiftRA, types.TypeFlags)
 			v0.AuxInt = c
 			v0.AddArg2(x, y)
-			b.resetWithControl(BlockARMLE, v0)
+			b.resetWithControl(BlockARMLEnoov, v0)
 			return true
 		}
 		// match: (LE (CMPconst [0] l:(ANDshiftLLreg x y z)) yes no)
 		// cond: l.Uses==1
-		// result: (LE (TSTshiftLLreg x y z) yes no)
+		// result: (LEnoov (TSTshiftLLreg x y z) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -19270,12 +19270,12 @@ func rewriteBlockARM(b *Block) bool {
 			}
 			v0 := b.NewValue0(v_0.Pos, OpARMTSTshiftLLreg, types.TypeFlags)
 			v0.AddArg3(x, y, z)
-			b.resetWithControl(BlockARMLE, v0)
+			b.resetWithControl(BlockARMLEnoov, v0)
 			return true
 		}
 		// match: (LE (CMPconst [0] l:(ANDshiftRLreg x y z)) yes no)
 		// cond: l.Uses==1
-		// result: (LE (TSTshiftRLreg x y z) yes no)
+		// result: (LEnoov (TSTshiftRLreg x y z) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -19293,12 +19293,12 @@ func rewriteBlockARM(b *Block) bool {
 			}
 			v0 := b.NewValue0(v_0.Pos, OpARMTSTshiftRLreg, types.TypeFlags)
 			v0.AddArg3(x, y, z)
-			b.resetWithControl(BlockARMLE, v0)
+			b.resetWithControl(BlockARMLEnoov, v0)
 			return true
 		}
 		// match: (LE (CMPconst [0] l:(ANDshiftRAreg x y z)) yes no)
 		// cond: l.Uses==1
-		// result: (LE (TSTshiftRAreg x y z) yes no)
+		// result: (LEnoov (TSTshiftRAreg x y z) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -19316,12 +19316,12 @@ func rewriteBlockARM(b *Block) bool {
 			}
 			v0 := b.NewValue0(v_0.Pos, OpARMTSTshiftRAreg, types.TypeFlags)
 			v0.AddArg3(x, y, z)
-			b.resetWithControl(BlockARMLE, v0)
+			b.resetWithControl(BlockARMLEnoov, v0)
 			return true
 		}
 		// match: (LE (CMPconst [0] l:(XOR x y)) yes no)
 		// cond: l.Uses==1
-		// result: (LE (TEQ x y) yes no)
+		// result: (LEnoov (TEQ x y) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -19342,14 +19342,14 @@ func rewriteBlockARM(b *Block) bool {
 				}
 				v0 := b.NewValue0(v_0.Pos, OpARMTEQ, types.TypeFlags)
 				v0.AddArg2(x, y)
-				b.resetWithControl(BlockARMLE, v0)
+				b.resetWithControl(BlockARMLEnoov, v0)
 				return true
 			}
 			break
 		}
 		// match: (LE (CMPconst [0] l:(XORconst [c] x)) yes no)
 		// cond: l.Uses==1
-		// result: (LE (TEQconst [c] x) yes no)
+		// result: (LEnoov (TEQconst [c] x) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -19367,12 +19367,12 @@ func rewriteBlockARM(b *Block) bool {
 			v0 := b.NewValue0(v_0.Pos, OpARMTEQconst, types.TypeFlags)
 			v0.AuxInt = c
 			v0.AddArg(x)
-			b.resetWithControl(BlockARMLE, v0)
+			b.resetWithControl(BlockARMLEnoov, v0)
 			return true
 		}
 		// match: (LE (CMPconst [0] l:(XORshiftLL x y [c])) yes no)
 		// cond: l.Uses==1
-		// result: (LE (TEQshiftLL x y [c]) yes no)
+		// result: (LEnoov (TEQshiftLL x y [c]) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -19391,12 +19391,12 @@ func rewriteBlockARM(b *Block) bool {
 			v0 := b.NewValue0(v_0.Pos, OpARMTEQshiftLL, types.TypeFlags)
 			v0.AuxInt = c
 			v0.AddArg2(x, y)
-			b.resetWithControl(BlockARMLE, v0)
+			b.resetWithControl(BlockARMLEnoov, v0)
 			return true
 		}
 		// match: (LE (CMPconst [0] l:(XORshiftRL x y [c])) yes no)
 		// cond: l.Uses==1
-		// result: (LE (TEQshiftRL x y [c]) yes no)
+		// result: (LEnoov (TEQshiftRL x y [c]) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -19415,12 +19415,12 @@ func rewriteBlockARM(b *Block) bool {
 			v0 := b.NewValue0(v_0.Pos, OpARMTEQshiftRL, types.TypeFlags)
 			v0.AuxInt = c
 			v0.AddArg2(x, y)
-			b.resetWithControl(BlockARMLE, v0)
+			b.resetWithControl(BlockARMLEnoov, v0)
 			return true
 		}
 		// match: (LE (CMPconst [0] l:(XORshiftRA x y [c])) yes no)
 		// cond: l.Uses==1
-		// result: (LE (TEQshiftRA x y [c]) yes no)
+		// result: (LEnoov (TEQshiftRA x y [c]) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -19439,12 +19439,12 @@ func rewriteBlockARM(b *Block) bool {
 			v0 := b.NewValue0(v_0.Pos, OpARMTEQshiftRA, types.TypeFlags)
 			v0.AuxInt = c
 			v0.AddArg2(x, y)
-			b.resetWithControl(BlockARMLE, v0)
+			b.resetWithControl(BlockARMLEnoov, v0)
 			return true
 		}
 		// match: (LE (CMPconst [0] l:(XORshiftLLreg x y z)) yes no)
 		// cond: l.Uses==1
-		// result: (LE (TEQshiftLLreg x y z) yes no)
+		// result: (LEnoov (TEQshiftLLreg x y z) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -19462,12 +19462,12 @@ func rewriteBlockARM(b *Block) bool {
 			}
 			v0 := b.NewValue0(v_0.Pos, OpARMTEQshiftLLreg, types.TypeFlags)
 			v0.AddArg3(x, y, z)
-			b.resetWithControl(BlockARMLE, v0)
+			b.resetWithControl(BlockARMLEnoov, v0)
 			return true
 		}
 		// match: (LE (CMPconst [0] l:(XORshiftRLreg x y z)) yes no)
 		// cond: l.Uses==1
-		// result: (LE (TEQshiftRLreg x y z) yes no)
+		// result: (LEnoov (TEQshiftRLreg x y z) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -19485,12 +19485,12 @@ func rewriteBlockARM(b *Block) bool {
 			}
 			v0 := b.NewValue0(v_0.Pos, OpARMTEQshiftRLreg, types.TypeFlags)
 			v0.AddArg3(x, y, z)
-			b.resetWithControl(BlockARMLE, v0)
+			b.resetWithControl(BlockARMLEnoov, v0)
 			return true
 		}
 		// match: (LE (CMPconst [0] l:(XORshiftRAreg x y z)) yes no)
 		// cond: l.Uses==1
-		// result: (LE (TEQshiftRAreg x y z) yes no)
+		// result: (LEnoov (TEQshiftRAreg x y z) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -19508,7 +19508,7 @@ func rewriteBlockARM(b *Block) bool {
 			}
 			v0 := b.NewValue0(v_0.Pos, OpARMTEQshiftRAreg, types.TypeFlags)
 			v0.AddArg3(x, y, z)
-			b.resetWithControl(BlockARMLE, v0)
+			b.resetWithControl(BlockARMLEnoov, v0)
 			return true
 		}
 	case BlockARMLEnoov:
@@ -20009,7 +20009,7 @@ func rewriteBlockARM(b *Block) bool {
 		}
 		// match: (LT (CMPconst [0] l:(AND x y)) yes no)
 		// cond: l.Uses==1
-		// result: (LT (TST x y) yes no)
+		// result: (LTnoov (TST x y) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -20030,14 +20030,14 @@ func rewriteBlockARM(b *Block) bool {
 				}
 				v0 := b.NewValue0(v_0.Pos, OpARMTST, types.TypeFlags)
 				v0.AddArg2(x, y)
-				b.resetWithControl(BlockARMLT, v0)
+				b.resetWithControl(BlockARMLTnoov, v0)
 				return true
 			}
 			break
 		}
 		// match: (LT (CMPconst [0] l:(ANDconst [c] x)) yes no)
 		// cond: l.Uses==1
-		// result: (LT (TSTconst [c] x) yes no)
+		// result: (LTnoov (TSTconst [c] x) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -20055,12 +20055,12 @@ func rewriteBlockARM(b *Block) bool {
 			v0 := b.NewValue0(v_0.Pos, OpARMTSTconst, types.TypeFlags)
 			v0.AuxInt = c
 			v0.AddArg(x)
-			b.resetWithControl(BlockARMLT, v0)
+			b.resetWithControl(BlockARMLTnoov, v0)
 			return true
 		}
 		// match: (LT (CMPconst [0] l:(ANDshiftLL x y [c])) yes no)
 		// cond: l.Uses==1
-		// result: (LT (TSTshiftLL x y [c]) yes no)
+		// result: (LTnoov (TSTshiftLL x y [c]) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -20079,12 +20079,12 @@ func rewriteBlockARM(b *Block) bool {
 			v0 := b.NewValue0(v_0.Pos, OpARMTSTshiftLL, types.TypeFlags)
 			v0.AuxInt = c
 			v0.AddArg2(x, y)
-			b.resetWithControl(BlockARMLT, v0)
+			b.resetWithControl(BlockARMLTnoov, v0)
 			return true
 		}
 		// match: (LT (CMPconst [0] l:(ANDshiftRL x y [c])) yes no)
 		// cond: l.Uses==1
-		// result: (LT (TSTshiftRL x y [c]) yes no)
+		// result: (LTnoov (TSTshiftRL x y [c]) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -20103,12 +20103,12 @@ func rewriteBlockARM(b *Block) bool {
 			v0 := b.NewValue0(v_0.Pos, OpARMTSTshiftRL, types.TypeFlags)
 			v0.AuxInt = c
 			v0.AddArg2(x, y)
-			b.resetWithControl(BlockARMLT, v0)
+			b.resetWithControl(BlockARMLTnoov, v0)
 			return true
 		}
 		// match: (LT (CMPconst [0] l:(ANDshiftRA x y [c])) yes no)
 		// cond: l.Uses==1
-		// result: (LT (TSTshiftRA x y [c]) yes no)
+		// result: (LTnoov (TSTshiftRA x y [c]) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -20127,12 +20127,12 @@ func rewriteBlockARM(b *Block) bool {
 			v0 := b.NewValue0(v_0.Pos, OpARMTSTshiftRA, types.TypeFlags)
 			v0.AuxInt = c
 			v0.AddArg2(x, y)
-			b.resetWithControl(BlockARMLT, v0)
+			b.resetWithControl(BlockARMLTnoov, v0)
 			return true
 		}
 		// match: (LT (CMPconst [0] l:(ANDshiftLLreg x y z)) yes no)
 		// cond: l.Uses==1
-		// result: (LT (TSTshiftLLreg x y z) yes no)
+		// result: (LTnoov (TSTshiftLLreg x y z) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -20150,12 +20150,12 @@ func rewriteBlockARM(b *Block) bool {
 			}
 			v0 := b.NewValue0(v_0.Pos, OpARMTSTshiftLLreg, types.TypeFlags)
 			v0.AddArg3(x, y, z)
-			b.resetWithControl(BlockARMLT, v0)
+			b.resetWithControl(BlockARMLTnoov, v0)
 			return true
 		}
 		// match: (LT (CMPconst [0] l:(ANDshiftRLreg x y z)) yes no)
 		// cond: l.Uses==1
-		// result: (LT (TSTshiftRLreg x y z) yes no)
+		// result: (LTnoov (TSTshiftRLreg x y z) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -20173,12 +20173,12 @@ func rewriteBlockARM(b *Block) bool {
 			}
 			v0 := b.NewValue0(v_0.Pos, OpARMTSTshiftRLreg, types.TypeFlags)
 			v0.AddArg3(x, y, z)
-			b.resetWithControl(BlockARMLT, v0)
+			b.resetWithControl(BlockARMLTnoov, v0)
 			return true
 		}
 		// match: (LT (CMPconst [0] l:(ANDshiftRAreg x y z)) yes no)
 		// cond: l.Uses==1
-		// result: (LT (TSTshiftRAreg x y z) yes no)
+		// result: (LTnoov (TSTshiftRAreg x y z) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -20196,12 +20196,12 @@ func rewriteBlockARM(b *Block) bool {
 			}
 			v0 := b.NewValue0(v_0.Pos, OpARMTSTshiftRAreg, types.TypeFlags)
 			v0.AddArg3(x, y, z)
-			b.resetWithControl(BlockARMLT, v0)
+			b.resetWithControl(BlockARMLTnoov, v0)
 			return true
 		}
 		// match: (LT (CMPconst [0] l:(XOR x y)) yes no)
 		// cond: l.Uses==1
-		// result: (LT (TEQ x y) yes no)
+		// result: (LTnoov (TEQ x y) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -20222,14 +20222,14 @@ func rewriteBlockARM(b *Block) bool {
 				}
 				v0 := b.NewValue0(v_0.Pos, OpARMTEQ, types.TypeFlags)
 				v0.AddArg2(x, y)
-				b.resetWithControl(BlockARMLT, v0)
+				b.resetWithControl(BlockARMLTnoov, v0)
 				return true
 			}
 			break
 		}
 		// match: (LT (CMPconst [0] l:(XORconst [c] x)) yes no)
 		// cond: l.Uses==1
-		// result: (LT (TEQconst [c] x) yes no)
+		// result: (LTnoov (TEQconst [c] x) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -20247,12 +20247,12 @@ func rewriteBlockARM(b *Block) bool {
 			v0 := b.NewValue0(v_0.Pos, OpARMTEQconst, types.TypeFlags)
 			v0.AuxInt = c
 			v0.AddArg(x)
-			b.resetWithControl(BlockARMLT, v0)
+			b.resetWithControl(BlockARMLTnoov, v0)
 			return true
 		}
 		// match: (LT (CMPconst [0] l:(XORshiftLL x y [c])) yes no)
 		// cond: l.Uses==1
-		// result: (LT (TEQshiftLL x y [c]) yes no)
+		// result: (LTnoov (TEQshiftLL x y [c]) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -20271,12 +20271,12 @@ func rewriteBlockARM(b *Block) bool {
 			v0 := b.NewValue0(v_0.Pos, OpARMTEQshiftLL, types.TypeFlags)
 			v0.AuxInt = c
 			v0.AddArg2(x, y)
-			b.resetWithControl(BlockARMLT, v0)
+			b.resetWithControl(BlockARMLTnoov, v0)
 			return true
 		}
 		// match: (LT (CMPconst [0] l:(XORshiftRL x y [c])) yes no)
 		// cond: l.Uses==1
-		// result: (LT (TEQshiftRL x y [c]) yes no)
+		// result: (LTnoov (TEQshiftRL x y [c]) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -20295,12 +20295,12 @@ func rewriteBlockARM(b *Block) bool {
 			v0 := b.NewValue0(v_0.Pos, OpARMTEQshiftRL, types.TypeFlags)
 			v0.AuxInt = c
 			v0.AddArg2(x, y)
-			b.resetWithControl(BlockARMLT, v0)
+			b.resetWithControl(BlockARMLTnoov, v0)
 			return true
 		}
 		// match: (LT (CMPconst [0] l:(XORshiftRA x y [c])) yes no)
 		// cond: l.Uses==1
-		// result: (LT (TEQshiftRA x y [c]) yes no)
+		// result: (LTnoov (TEQshiftRA x y [c]) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -20319,12 +20319,12 @@ func rewriteBlockARM(b *Block) bool {
 			v0 := b.NewValue0(v_0.Pos, OpARMTEQshiftRA, types.TypeFlags)
 			v0.AuxInt = c
 			v0.AddArg2(x, y)
-			b.resetWithControl(BlockARMLT, v0)
+			b.resetWithControl(BlockARMLTnoov, v0)
 			return true
 		}
 		// match: (LT (CMPconst [0] l:(XORshiftLLreg x y z)) yes no)
 		// cond: l.Uses==1
-		// result: (LT (TEQshiftLLreg x y z) yes no)
+		// result: (LTnoov (TEQshiftLLreg x y z) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -20342,12 +20342,12 @@ func rewriteBlockARM(b *Block) bool {
 			}
 			v0 := b.NewValue0(v_0.Pos, OpARMTEQshiftLLreg, types.TypeFlags)
 			v0.AddArg3(x, y, z)
-			b.resetWithControl(BlockARMLT, v0)
+			b.resetWithControl(BlockARMLTnoov, v0)
 			return true
 		}
 		// match: (LT (CMPconst [0] l:(XORshiftRLreg x y z)) yes no)
 		// cond: l.Uses==1
-		// result: (LT (TEQshiftRLreg x y z) yes no)
+		// result: (LTnoov (TEQshiftRLreg x y z) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -20365,12 +20365,12 @@ func rewriteBlockARM(b *Block) bool {
 			}
 			v0 := b.NewValue0(v_0.Pos, OpARMTEQshiftRLreg, types.TypeFlags)
 			v0.AddArg3(x, y, z)
-			b.resetWithControl(BlockARMLT, v0)
+			b.resetWithControl(BlockARMLTnoov, v0)
 			return true
 		}
 		// match: (LT (CMPconst [0] l:(XORshiftRAreg x y z)) yes no)
 		// cond: l.Uses==1
-		// result: (LT (TEQshiftRAreg x y z) yes no)
+		// result: (LTnoov (TEQshiftRAreg x y z) yes no)
 		for b.Controls[0].Op == OpARMCMPconst {
 			v_0 := b.Controls[0]
 			if v_0.AuxInt != 0 {
@@ -20388,7 +20388,7 @@ func rewriteBlockARM(b *Block) bool {
 			}
 			v0 := b.NewValue0(v_0.Pos, OpARMTEQshiftRAreg, types.TypeFlags)
 			v0.AddArg3(x, y, z)
-			b.resetWithControl(BlockARMLT, v0)
+			b.resetWithControl(BlockARMLTnoov, v0)
 			return true
 		}
 	case BlockARMLTnoov:
diff --git a/test/fixedbugs/issue42876.go b/test/fixedbugs/issue42876.go
new file mode 100644
index 00000000000..67cf4919ac5
--- /dev/null
+++ b/test/fixedbugs/issue42876.go
@@ -0,0 +1,18 @@
+// run
+
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+var x = [4]int32{-0x7fffffff, 0x7fffffff, 2, 4}
+
+func main() {
+	if x[0] > x[1] {
+		panic("fail 1")
+	}
+	if x[2]&x[3] < 0 {
+		panic("fail 2") // Fails here
+	}
+}