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[release-branch.go1.8] cmd/compile,runtime: fix atomic And8 for mipsle 

Removing stray xori that came from big endian copy/paste.
Adding atomicand8 check to runtime.check() that would have revealed
this error.
Might fix #19396.

Change-Id: If8d6f25d3e205496163541eb112548aa66df9c2a
Reviewed-on: https://go-review.googlesource.com/39597
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This commit is contained in:
Vladimir Stefanovic 2017-03-21 14:57:58 +01:00 committed by Austin Clements
parent bf71119d54
commit 77476e81d9
3 changed files with 9 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
src/cmd/compile/internal/ssa/gen/MIPS.rules
View File

@ -404,8 +404,7 @@
(ANDconst <config.fe.TypeUInt32()> [3] ptr)))
(NORconst [0] <config.fe.TypeUInt32()> (SLL <config.fe.TypeUInt32()>
(MOVWconst [0xff]) (SLLconst <config.fe.TypeUInt32()> [3]
(ANDconst <config.fe.TypeUInt32()> [3]
(XORconst <config.fe.TypeUInt32()> [3] ptr)))))) mem)
(ANDconst <config.fe.TypeUInt32()> [3] ptr))))) mem)
// AtomicOr8(ptr,val) -> LoweredAtomicOr(ptr&^3,uint32(val) << (((ptr^3) & 3) * 8))
(AtomicOr8 ptr val mem) && config.BigEndian ->

7
src/cmd/compile/internal/ssa/rewriteMIPS.go
View File

@ -712,7 +712,7 @@ func rewriteValueMIPS_OpAtomicAnd8(v *Value, config *Config) bool {
_ = b
// match: (AtomicAnd8 ptr val mem)
// cond: !config.BigEndian
// result: (LoweredAtomicAnd (AND <config.fe.TypeUInt32().PtrTo()> (MOVWconst [^3]) ptr) (OR <config.fe.TypeUInt32()> (SLL <config.fe.TypeUInt32()> (ZeroExt8to32 val) (SLLconst <config.fe.TypeUInt32()> [3] (ANDconst <config.fe.TypeUInt32()> [3] ptr))) (NORconst [0] <config.fe.TypeUInt32()> (SLL <config.fe.TypeUInt32()> (MOVWconst [0xff]) (SLLconst <config.fe.TypeUInt32()> [3] (ANDconst <config.fe.TypeUInt32()> [3] (XORconst <config.fe.TypeUInt32()> [3] ptr)))))) mem)
// result: (LoweredAtomicAnd (AND <config.fe.TypeUInt32().PtrTo()> (MOVWconst [^3]) ptr) (OR <config.fe.TypeUInt32()> (SLL <config.fe.TypeUInt32()> (ZeroExt8to32 val) (SLLconst <config.fe.TypeUInt32()> [3] (ANDconst <config.fe.TypeUInt32()> [3] ptr))) (NORconst [0] <config.fe.TypeUInt32()> (SLL <config.fe.TypeUInt32()> (MOVWconst [0xff]) (SLLconst <config.fe.TypeUInt32()> [3] (ANDconst <config.fe.TypeUInt32()> [3] ptr))))) mem)
for {
ptr := v.Args[0]
val := v.Args[1]
@ -750,10 +750,7 @@ func rewriteValueMIPS_OpAtomicAnd8(v *Value, config *Config) bool {
v10.AuxInt = 3
v11 := b.NewValue0(v.Line, OpMIPSANDconst, config.fe.TypeUInt32())
v11.AuxInt = 3
v12 := b.NewValue0(v.Line, OpMIPSXORconst, config.fe.TypeUInt32())
v12.AuxInt = 3
v12.AddArg(ptr)
v11.AddArg(v12)
v11.AddArg(ptr)
v10.AddArg(v11)
v8.AddArg(v10)
v7.AddArg(v8)

6
src/runtime/runtime1.go
View File

@ -260,6 +260,12 @@ func check() {
throw("atomicor8")
}
m = [4]byte{0xff, 0xff, 0xff, 0xff}
atomic.And8(&m[1], 0x1)
if m[0] != 0xff || m[1] != 0x1 || m[2] != 0xff || m[3] != 0xff {
throw("atomicand8")
}
*(*uint64)(unsafe.Pointer(&j)) = ^uint64(0)
if j == j {
throw("float64nan")