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cmd/compile: PPC64, find compare-with-immediate

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Added rules for compare double and word immediate,
including those that use invertflags to cope with
flipped operands.

Change-Id: I594430a210e076e52299a2cc6ab074dbb04a02bd
Reviewed-on: https://go-review.googlesource.com/29763
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
This commit is contained in:
David Chase 2016-09-26 10:06:10 -07:00
parent 7f1bc53379
commit 3390294308
3 changed files with 194 additions and 0 deletions
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9
src/cmd/compile/internal/ssa/gen/PPC64.rules
View File

@ -639,3 +639,12 @@
(MOVHstore [off] {sym} ptr (MOVHreg x) mem) -> (MOVHstore [off] {sym} ptr x mem)
(MOVHstore [off] {sym} ptr (MOVHZreg x) mem) -> (MOVHstore [off] {sym} ptr x mem)
(CMP x (MOVDconst [c])) && is16Bit(c) -> (CMPconst x [c])
(CMP (MOVDconst [c]) y) && is16Bit(c) -> (InvertFlags (CMPconst y [c]))
(CMPW x (MOVDconst [c])) && is16Bit(c) -> (CMPWconst x [c])
(CMPW (MOVDconst [c]) y) && is16Bit(c) -> (InvertFlags (CMPWconst y [c]))
(CMPU x (MOVDconst [c])) && isU16Bit(c) -> (CMPUconst x [c])
(CMPU (MOVDconst [c]) y) && isU16Bit(c) -> (InvertFlags (CMPUconst y [c]))
(CMPWU x (MOVDconst [c])) && isU16Bit(c) -> (CMPWUconst x [c])
(CMPWU (MOVDconst [c]) y) && isU16Bit(c) -> (InvertFlags (CMPWUconst y [c]))

5
src/cmd/compile/internal/ssa/rewrite.go
View File

@ -229,6 +229,11 @@ func is16Bit(n int64) bool {
return n == int64(int16(n))
}
// is16Bit reports whether n can be represented as an unsigned 16 bit integer.
func isU16Bit(n int64) bool {
return n == int64(uint16(n))
}
// is20Bit reports whether n can be represented as a signed 20 bit integer.
func is20Bit(n int64) bool {
return -(1<<19) <= n && n < (1<<19)

180
src/cmd/compile/internal/ssa/rewritePPC64.go
View File

@ -344,8 +344,16 @@ func rewriteValuePPC64(v *Value, config *Config) bool {
return rewriteValuePPC64_OpPPC64ADDconst(v, config)
case OpPPC64ANDconst:
return rewriteValuePPC64_OpPPC64ANDconst(v, config)
case OpPPC64CMP:
return rewriteValuePPC64_OpPPC64CMP(v, config)
case OpPPC64CMPU:
return rewriteValuePPC64_OpPPC64CMPU(v, config)
case OpPPC64CMPUconst:
return rewriteValuePPC64_OpPPC64CMPUconst(v, config)
case OpPPC64CMPW:
return rewriteValuePPC64_OpPPC64CMPW(v, config)
case OpPPC64CMPWU:
return rewriteValuePPC64_OpPPC64CMPWU(v, config)
case OpPPC64CMPWUconst:
return rewriteValuePPC64_OpPPC64CMPWUconst(v, config)
case OpPPC64CMPWconst:
@ -4137,6 +4145,92 @@ func rewriteValuePPC64_OpPPC64ANDconst(v *Value, config *Config) bool {
}
return false
}
func rewriteValuePPC64_OpPPC64CMP(v *Value, config *Config) bool {
b := v.Block
_ = b
// match: (CMP x (MOVDconst [c]))
// cond: is16Bit(c)
// result: (CMPconst x [c])
for {
x := v.Args[0]
v_1 := v.Args[1]
if v_1.Op != OpPPC64MOVDconst {
break
}
c := v_1.AuxInt
if !(is16Bit(c)) {
break
}
v.reset(OpPPC64CMPconst)
v.AuxInt = c
v.AddArg(x)
return true
}
// match: (CMP (MOVDconst [c]) y)
// cond: is16Bit(c)
// result: (InvertFlags (CMPconst y [c]))
for {
v_0 := v.Args[0]
if v_0.Op != OpPPC64MOVDconst {
break
}
c := v_0.AuxInt
y := v.Args[1]
if !(is16Bit(c)) {
break
}
v.reset(OpPPC64InvertFlags)
v0 := b.NewValue0(v.Line, OpPPC64CMPconst, TypeFlags)
v0.AuxInt = c
v0.AddArg(y)
v.AddArg(v0)
return true
}
return false
}
func rewriteValuePPC64_OpPPC64CMPU(v *Value, config *Config) bool {
b := v.Block
_ = b
// match: (CMPU x (MOVDconst [c]))
// cond: isU16Bit(c)
// result: (CMPUconst x [c])
for {
x := v.Args[0]
v_1 := v.Args[1]
if v_1.Op != OpPPC64MOVDconst {
break
}
c := v_1.AuxInt
if !(isU16Bit(c)) {
break
}
v.reset(OpPPC64CMPUconst)
v.AuxInt = c
v.AddArg(x)
return true
}
// match: (CMPU (MOVDconst [c]) y)
// cond: isU16Bit(c)
// result: (InvertFlags (CMPUconst y [c]))
for {
v_0 := v.Args[0]
if v_0.Op != OpPPC64MOVDconst {
break
}
c := v_0.AuxInt
y := v.Args[1]
if !(isU16Bit(c)) {
break
}
v.reset(OpPPC64InvertFlags)
v0 := b.NewValue0(v.Line, OpPPC64CMPUconst, TypeFlags)
v0.AuxInt = c
v0.AddArg(y)
v.AddArg(v0)
return true
}
return false
}
func rewriteValuePPC64_OpPPC64CMPUconst(v *Value, config *Config) bool {
b := v.Block
_ = b
@ -4190,6 +4284,92 @@ func rewriteValuePPC64_OpPPC64CMPUconst(v *Value, config *Config) bool {
}
return false
}
func rewriteValuePPC64_OpPPC64CMPW(v *Value, config *Config) bool {
b := v.Block
_ = b
// match: (CMPW x (MOVDconst [c]))
// cond: is16Bit(c)
// result: (CMPWconst x [c])
for {
x := v.Args[0]
v_1 := v.Args[1]
if v_1.Op != OpPPC64MOVDconst {
break
}
c := v_1.AuxInt
if !(is16Bit(c)) {
break
}
v.reset(OpPPC64CMPWconst)
v.AuxInt = c
v.AddArg(x)
return true
}
// match: (CMPW (MOVDconst [c]) y)
// cond: is16Bit(c)
// result: (InvertFlags (CMPWconst y [c]))
for {
v_0 := v.Args[0]
if v_0.Op != OpPPC64MOVDconst {
break
}
c := v_0.AuxInt
y := v.Args[1]
if !(is16Bit(c)) {
break
}
v.reset(OpPPC64InvertFlags)
v0 := b.NewValue0(v.Line, OpPPC64CMPWconst, TypeFlags)
v0.AuxInt = c
v0.AddArg(y)
v.AddArg(v0)
return true
}
return false
}
func rewriteValuePPC64_OpPPC64CMPWU(v *Value, config *Config) bool {
b := v.Block
_ = b
// match: (CMPWU x (MOVDconst [c]))
// cond: isU16Bit(c)
// result: (CMPWUconst x [c])
for {
x := v.Args[0]
v_1 := v.Args[1]
if v_1.Op != OpPPC64MOVDconst {
break
}
c := v_1.AuxInt
if !(isU16Bit(c)) {
break
}
v.reset(OpPPC64CMPWUconst)
v.AuxInt = c
v.AddArg(x)
return true
}
// match: (CMPWU (MOVDconst [c]) y)
// cond: isU16Bit(c)
// result: (InvertFlags (CMPWUconst y [c]))
for {
v_0 := v.Args[0]
if v_0.Op != OpPPC64MOVDconst {
break
}
c := v_0.AuxInt
y := v.Args[1]
if !(isU16Bit(c)) {
break
}
v.reset(OpPPC64InvertFlags)
v0 := b.NewValue0(v.Line, OpPPC64CMPWUconst, TypeFlags)
v0.AuxInt = c
v0.AddArg(y)
v.AddArg(v0)
return true
}
return false
}
func rewriteValuePPC64_OpPPC64CMPWUconst(v *Value, config *Config) bool {
b := v.Block
_ = b