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cmd/compile: fold ADDconsts together for PPC 

Change-Id: I571f03af6f791e78e7e18addcc310eb25747cdcf
Reviewed-on: https://go-review.googlesource.com/29351
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Keith Randall 2016-09-16 12:08:05 -07:00
parent 6129f37367
commit 2679282da4
2 changed files with 33 additions and 6 deletions
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5
src/cmd/compile/internal/ssa/gen/PPC64.rules
View File

@ -530,8 +530,9 @@
// Optimizations
(ADD (MOVDconst [c]) x) && int64(int32(c)) == c -> (ADDconst [c] x)
(ADD x (MOVDconst [c])) && int64(int32(c)) == c -> (ADDconst [c] x)
(ADD (MOVDconst [c]) x) && is32Bit(c) -> (ADDconst [c] x)
(ADD x (MOVDconst [c])) && is32Bit(c) -> (ADDconst [c] x)
(ADDconst [c] (ADDconst [d] x)) && is32Bit(c+d) -> (ADDconst [c+d] x)
// Fold offsets for stores.
(MOVDstore [off1] {sym} (ADDconst [off2] x) val mem) && is16Bit(off1+off2) -> (MOVDstore [off1+off2] {sym} x val mem)

34
src/cmd/compile/internal/ssa/rewritePPC64.go
View File

@ -340,6 +340,8 @@ func rewriteValuePPC64(v *Value, config *Config) bool {
return rewriteValuePPC64_OpOrB(v, config)
case OpPPC64ADD:
return rewriteValuePPC64_OpPPC64ADD(v, config)
case OpPPC64ADDconst:
return rewriteValuePPC64_OpPPC64ADDconst(v, config)
case OpPPC64CMPUconst:
return rewriteValuePPC64_OpPPC64CMPUconst(v, config)
case OpPPC64CMPWUconst:
@ -3977,7 +3979,7 @@ func rewriteValuePPC64_OpPPC64ADD(v *Value, config *Config) bool {
b := v.Block
_ = b
// match: (ADD (MOVDconst [c]) x)
// cond: int64(int32(c)) == c
// cond: is32Bit(c)
// result: (ADDconst [c] x)
for {
v_0 := v.Args[0]
@ -3986,7 +3988,7 @@ func rewriteValuePPC64_OpPPC64ADD(v *Value, config *Config) bool {
}
c := v_0.AuxInt
x := v.Args[1]
if !(int64(int32(c)) == c) {
if !(is32Bit(c)) {
break
}
v.reset(OpPPC64ADDconst)
@ -3995,7 +3997,7 @@ func rewriteValuePPC64_OpPPC64ADD(v *Value, config *Config) bool {
return true
}
// match: (ADD x (MOVDconst [c]))
// cond: int64(int32(c)) == c
// cond: is32Bit(c)
// result: (ADDconst [c] x)
for {
x := v.Args[0]
@ -4004,7 +4006,7 @@ func rewriteValuePPC64_OpPPC64ADD(v *Value, config *Config) bool {
break
}
c := v_1.AuxInt
if !(int64(int32(c)) == c) {
if !(is32Bit(c)) {
break
}
v.reset(OpPPC64ADDconst)
@ -4014,6 +4016,30 @@ func rewriteValuePPC64_OpPPC64ADD(v *Value, config *Config) bool {
}
return false
}
func rewriteValuePPC64_OpPPC64ADDconst(v *Value, config *Config) bool {
b := v.Block
_ = b
// match: (ADDconst [c] (ADDconst [d] x))
// cond: is32Bit(c+d)
// result: (ADDconst [c+d] x)
for {
c := v.AuxInt
v_0 := v.Args[0]
if v_0.Op != OpPPC64ADDconst {
break
}
d := v_0.AuxInt
x := v_0.Args[0]
if !(is32Bit(c + d)) {
break
}
v.reset(OpPPC64ADDconst)
v.AuxInt = c + d
v.AddArg(x)
return true
}
return false
}
func rewriteValuePPC64_OpPPC64CMPUconst(v *Value, config *Config) bool {
b := v.Block
_ = b