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| author | Keith Randall <khr@golang.org> | 2020-12-09 08:27:54 -0800 |
|---|---|---|
| committer | Keith Randall <khr@golang.org> | 2020-12-10 03:18:00 +0000 |
| commit | 6c64b6db6802818dd9a4789cdd564f19b70b6b4c (patch) | |
| tree | 8775d945bf2860c57a48c7145e91768045c3f6ea /src/cmd/compile/internal/ssa/rewriteMIPS64.go | |
| parent | 89f465c2b59cea32c10ed69eaa07e17f85c910e2 (diff) | |
| download | go-6c64b6db6802818dd9a4789cdd564f19b70b6b4c.tar.gz go-6c64b6db6802818dd9a4789cdd564f19b70b6b4c.zip | |
cmd/compile: don't constant fold divide by zero
It just makes the compiler crash. Oops.
Fixes #43099
Change-Id: Id996c14799c1a5d0063ecae3b8770568161c2440
Reviewed-on: https://go-review.googlesource.com/c/go/+/276652
Trust: Keith Randall <khr@golang.org>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Diffstat (limited to 'src/cmd/compile/internal/ssa/rewriteMIPS64.go')
| -rw-r--r-- | src/cmd/compile/internal/ssa/rewriteMIPS64.go | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/ssa/rewriteMIPS64.go b/src/cmd/compile/internal/ssa/rewriteMIPS64.go index 29e3a8a363..d78f6089af 100644 --- a/src/cmd/compile/internal/ssa/rewriteMIPS64.go +++ b/src/cmd/compile/internal/ssa/rewriteMIPS64.go @@ -6887,6 +6887,7 @@ func rewriteValueMIPS64_OpSelect0(v *Value) bool { return true } // match: (Select0 (DIVV (MOVVconst [c]) (MOVVconst [d]))) + // cond: d != 0 // result: (MOVVconst [c%d]) for { if v_0.Op != OpMIPS64DIVV { @@ -6903,11 +6904,15 @@ func rewriteValueMIPS64_OpSelect0(v *Value) bool { break } d := auxIntToInt64(v_0_1.AuxInt) + if !(d != 0) { + break + } v.reset(OpMIPS64MOVVconst) v.AuxInt = int64ToAuxInt(c % d) return true } // match: (Select0 (DIVVU (MOVVconst [c]) (MOVVconst [d]))) + // cond: d != 0 // result: (MOVVconst [int64(uint64(c)%uint64(d))]) for { if v_0.Op != OpMIPS64DIVVU { @@ -6924,6 +6929,9 @@ func rewriteValueMIPS64_OpSelect0(v *Value) bool { break } d := auxIntToInt64(v_0_1.AuxInt) + if !(d != 0) { + break + } v.reset(OpMIPS64MOVVconst) v.AuxInt = int64ToAuxInt(int64(uint64(c) % uint64(d))) return true @@ -7099,6 +7107,7 @@ func rewriteValueMIPS64_OpSelect1(v *Value) bool { break } // match: (Select1 (DIVV (MOVVconst [c]) (MOVVconst [d]))) + // cond: d != 0 // result: (MOVVconst [c/d]) for { if v_0.Op != OpMIPS64DIVV { @@ -7115,11 +7124,15 @@ func rewriteValueMIPS64_OpSelect1(v *Value) bool { break } d := auxIntToInt64(v_0_1.AuxInt) + if !(d != 0) { + break + } v.reset(OpMIPS64MOVVconst) v.AuxInt = int64ToAuxInt(c / d) return true } // match: (Select1 (DIVVU (MOVVconst [c]) (MOVVconst [d]))) + // cond: d != 0 // result: (MOVVconst [int64(uint64(c)/uint64(d))]) for { if v_0.Op != OpMIPS64DIVVU { @@ -7136,6 +7149,9 @@ func rewriteValueMIPS64_OpSelect1(v *Value) bool { break } d := auxIntToInt64(v_0_1.AuxInt) + if !(d != 0) { + break + } v.reset(OpMIPS64MOVVconst) v.AuxInt = int64ToAuxInt(int64(uint64(c) / uint64(d))) return true |