diff options
| -rw-r--r-- | src/cmd/compile/internal/ssa/gen/AMD64.rules | 6 | ||||
| -rw-r--r-- | src/cmd/compile/internal/ssa/rewriteAMD64.go | 18 | ||||
| -rw-r--r-- | test/fixedbugs/issue42753.go | 13 |
3 files changed, 25 insertions, 12 deletions
diff --git a/src/cmd/compile/internal/ssa/gen/AMD64.rules b/src/cmd/compile/internal/ssa/gen/AMD64.rules index ee9ccfb41c..f7eb92dc8b 100644 --- a/src/cmd/compile/internal/ssa/gen/AMD64.rules +++ b/src/cmd/compile/internal/ssa/gen/AMD64.rules @@ -1429,11 +1429,11 @@ (NOTQ (MOVQconst [c])) -> (MOVQconst [^c]) (NOTL (MOVLconst [c])) -> (MOVLconst [^c]) (BTSQconst [c] (MOVQconst [d])) -> (MOVQconst [d|(1<<uint32(c))]) -(BTSLconst [c] (MOVLconst [d])) -> (MOVLconst [d|(1<<uint32(c))]) +(BTSLconst [c] (MOVLconst [d])) => (MOVLconst [d|(1<<uint32(c))]) (BTRQconst [c] (MOVQconst [d])) -> (MOVQconst [d&^(1<<uint32(c))]) -(BTRLconst [c] (MOVLconst [d])) -> (MOVLconst [d&^(1<<uint32(c))]) +(BTRLconst [c] (MOVLconst [d])) => (MOVLconst [d&^(1<<uint32(c))]) (BTCQconst [c] (MOVQconst [d])) -> (MOVQconst [d^(1<<uint32(c))]) -(BTCLconst [c] (MOVLconst [d])) -> (MOVLconst [d^(1<<uint32(c))]) +(BTCLconst [c] (MOVLconst [d])) => (MOVLconst [d^(1<<uint32(c))]) // If c or d doesn't fit into 32 bits, then we can't construct ORQconst, // but we can still constant-fold. diff --git a/src/cmd/compile/internal/ssa/rewriteAMD64.go b/src/cmd/compile/internal/ssa/rewriteAMD64.go index 72ed1eb62c..e59fa208c1 100644 --- a/src/cmd/compile/internal/ssa/rewriteAMD64.go +++ b/src/cmd/compile/internal/ssa/rewriteAMD64.go @@ -3526,13 +3526,13 @@ func rewriteValueAMD64_OpAMD64BTCLconst(v *Value) bool { // match: (BTCLconst [c] (MOVLconst [d])) // result: (MOVLconst [d^(1<<uint32(c))]) for { - c := v.AuxInt + c := auxIntToInt8(v.AuxInt) if v_0.Op != OpAMD64MOVLconst { break } - d := v_0.AuxInt + d := auxIntToInt32(v_0.AuxInt) v.reset(OpAMD64MOVLconst) - v.AuxInt = d ^ (1 << uint32(c)) + v.AuxInt = int32ToAuxInt(d ^ (1 << uint32(c))) return true } return false @@ -4010,13 +4010,13 @@ func rewriteValueAMD64_OpAMD64BTRLconst(v *Value) bool { // match: (BTRLconst [c] (MOVLconst [d])) // result: (MOVLconst [d&^(1<<uint32(c))]) for { - c := v.AuxInt + c := auxIntToInt8(v.AuxInt) if v_0.Op != OpAMD64MOVLconst { break } - d := v_0.AuxInt + d := auxIntToInt32(v_0.AuxInt) v.reset(OpAMD64MOVLconst) - v.AuxInt = d &^ (1 << uint32(c)) + v.AuxInt = int32ToAuxInt(d &^ (1 << uint32(c))) return true } return false @@ -4356,13 +4356,13 @@ func rewriteValueAMD64_OpAMD64BTSLconst(v *Value) bool { // match: (BTSLconst [c] (MOVLconst [d])) // result: (MOVLconst [d|(1<<uint32(c))]) for { - c := v.AuxInt + c := auxIntToInt8(v.AuxInt) if v_0.Op != OpAMD64MOVLconst { break } - d := v_0.AuxInt + d := auxIntToInt32(v_0.AuxInt) v.reset(OpAMD64MOVLconst) - v.AuxInt = d | (1 << uint32(c)) + v.AuxInt = int32ToAuxInt(d | (1 << uint32(c))) return true } return false diff --git a/test/fixedbugs/issue42753.go b/test/fixedbugs/issue42753.go new file mode 100644 index 0000000000..a998d1d3b3 --- /dev/null +++ b/test/fixedbugs/issue42753.go @@ -0,0 +1,13 @@ +// compile -d=ssa/check/on + +// 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 + +func f() uint32 { + s := "\x01" + x := -int32(s[0]) + return uint32(x) & 0x7fffffff +} |