cmd/compile: used TESTL instead of TESTQ for cpu feature flag detection
Uses one less byte when encoded. Performance is unchanged.
Change-Id: If400c9c9fc07a033e5ae9bf975ec512e432f7825
Reviewed-on: https://go-review.googlesource.com/c/go/+/354949
Trust: Keith Randall <khr@golang.org>
Trust: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
diff --git a/src/cmd/compile/internal/ssa/gen/AMD64.rules b/src/cmd/compile/internal/ssa/gen/AMD64.rules
index 9c476d8..8b73ee1 100644
--- a/src/cmd/compile/internal/ssa/gen/AMD64.rules
+++ b/src/cmd/compile/internal/ssa/gen/AMD64.rules
@@ -472,7 +472,7 @@
(GetCallerPC ...) => (LoweredGetCallerPC ...)
(GetCallerSP ...) => (LoweredGetCallerSP ...)
-(HasCPUFeature {s}) => (SETNE (CMPQconst [0] (LoweredHasCPUFeature {s})))
+(HasCPUFeature {s}) => (SETNE (CMPLconst [0] (LoweredHasCPUFeature {s})))
(Addr {sym} base) => (LEAQ {sym} base)
(LocalAddr {sym} base _) => (LEAQ {sym} base)
diff --git a/src/cmd/compile/internal/ssa/rewriteAMD64.go b/src/cmd/compile/internal/ssa/rewriteAMD64.go
index 88c76dd..201fbf2 100644
--- a/src/cmd/compile/internal/ssa/rewriteAMD64.go
+++ b/src/cmd/compile/internal/ssa/rewriteAMD64.go
@@ -29254,11 +29254,11 @@
b := v.Block
typ := &b.Func.Config.Types
// match: (HasCPUFeature {s})
- // result: (SETNE (CMPQconst [0] (LoweredHasCPUFeature {s})))
+ // result: (SETNE (CMPLconst [0] (LoweredHasCPUFeature {s})))
for {
s := auxToSym(v.Aux)
v.reset(OpAMD64SETNE)
- v0 := b.NewValue0(v.Pos, OpAMD64CMPQconst, types.TypeFlags)
+ v0 := b.NewValue0(v.Pos, OpAMD64CMPLconst, types.TypeFlags)
v0.AuxInt = int32ToAuxInt(0)
v1 := b.NewValue0(v.Pos, OpAMD64LoweredHasCPUFeature, typ.UInt64)
v1.Aux = symToAux(s)
