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[dev.ssa] cmd/compile/internal/ssa: fix the type of constant shift folding. 

Also throw in a few more shift constant folding.

Change-Id: Iabe00596987f594e0686fbac3d76376d94612340
Reviewed-on: https://go-review.googlesource.com/19543
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
This commit is contained in:
Alexandru Moșoi 2016-02-17 14:08:36 +01:00 committed by David Chase
parent c67cac0703
commit bc1fb32e9d
2 changed files with 199 additions and 18 deletions
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25
src/cmd/compile/internal/ssa/gen/generic.rules
View File

@ -53,6 +53,19 @@
(Rsh8x64 (Const8 [c]) (Const64 [d])) -> (Const8 [int64(int8(c) >> uint64(d))])
(Rsh8Ux64 (Const8 [c]) (Const64 [d])) -> (Const8 [int64(uint8(c) >> uint64(d))])
(Lsh64x64 (Const64 [0]) _) -> (Const64 [0])
(Rsh64x64 (Const64 [0]) _) -> (Const64 [0])
(Rsh64Ux64 (Const64 [0]) _) -> (Const64 [0])
(Lsh32x64 (Const32 [0]) _) -> (Const32 [0])
(Rsh32x64 (Const32 [0]) _) -> (Const32 [0])
(Rsh32Ux64 (Const32 [0]) _) -> (Const32 [0])
(Lsh16x64 (Const16 [0]) _) -> (Const16 [0])
(Rsh16x64 (Const16 [0]) _) -> (Const16 [0])
(Rsh16Ux64 (Const16 [0]) _) -> (Const16 [0])
(Lsh8x64 (Const8 [0]) _) -> (Const8 [0])
(Rsh8x64 (Const8 [0]) _) -> (Const8 [0])
(Rsh8Ux64 (Const8 [0]) _) -> (Const8 [0])
(IsInBounds (Const32 [c]) (Const32 [d])) -> (ConstBool [b2i(inBounds32(c,d))])
(IsInBounds (Const64 [c]) (Const64 [d])) -> (ConstBool [b2i(inBounds64(c,d))])
(IsSliceInBounds (Const32 [c]) (Const32 [d])) -> (ConstBool [b2i(sliceInBounds32(c,d))])
@ -191,12 +204,12 @@
// large left shifts of all values, and right shifts of unsigned values
(Lsh64x64 _ (Const64 [c])) && uint64(c) >= 64 -> (Const64 [0])
(Rsh64Ux64 _ (Const64 [c])) && uint64(c) >= 64 -> (Const64 [0])
(Lsh32x64 _ (Const64 [c])) && uint64(c) >= 32 -> (Const64 [0])
(Rsh32Ux64 _ (Const64 [c])) && uint64(c) >= 32 -> (Const64 [0])
(Lsh16x64 _ (Const64 [c])) && uint64(c) >= 16 -> (Const64 [0])
(Rsh16Ux64 _ (Const64 [c])) && uint64(c) >= 16 -> (Const64 [0])
(Lsh8x64 _ (Const64 [c])) && uint64(c) >= 8 -> (Const64 [0])
(Rsh8Ux64 _ (Const64 [c])) && uint64(c) >= 8 -> (Const64 [0])
(Lsh32x64 _ (Const64 [c])) && uint64(c) >= 32 -> (Const32 [0])
(Rsh32Ux64 _ (Const64 [c])) && uint64(c) >= 32 -> (Const32 [0])
(Lsh16x64 _ (Const64 [c])) && uint64(c) >= 16 -> (Const16 [0])
(Rsh16Ux64 _ (Const64 [c])) && uint64(c) >= 16 -> (Const16 [0])
(Lsh8x64 _ (Const64 [c])) && uint64(c) >= 8 -> (Const8 [0])
(Rsh8Ux64 _ (Const64 [c])) && uint64(c) >= 8 -> (Const8 [0])
// combine const shifts

192
src/cmd/compile/internal/ssa/rewritegeneric.go
View File

@ -3135,6 +3135,20 @@ func rewriteValuegeneric_OpLsh16x64(v *Value, config *Config) bool {
v.AuxInt = int64(int16(c) << uint64(d))
return true
}
// match: (Lsh16x64 (Const16 [0]) _)
// cond:
// result: (Const16 [0])
for {
if v.Args[0].Op != OpConst16 {
break
}
if v.Args[0].AuxInt != 0 {
break
}
v.reset(OpConst16)
v.AuxInt = 0
return true
}
// match: (Lsh16x64 x (Const64 [0]))
// cond:
// result: x
@ -3153,7 +3167,7 @@ func rewriteValuegeneric_OpLsh16x64(v *Value, config *Config) bool {
}
// match: (Lsh16x64 _ (Const64 [c]))
// cond: uint64(c) >= 16
// result: (Const64 [0])
// result: (Const16 [0])
for {
if v.Args[1].Op != OpConst64 {
break
@ -3162,7 +3176,7 @@ func rewriteValuegeneric_OpLsh16x64(v *Value, config *Config) bool {
if !(uint64(c) >= 16) {
break
}
v.reset(OpConst64)
v.reset(OpConst16)
v.AuxInt = 0
return true
}
@ -3280,6 +3294,20 @@ func rewriteValuegeneric_OpLsh32x64(v *Value, config *Config) bool {
v.AuxInt = int64(int32(c) << uint64(d))
return true
}
// match: (Lsh32x64 (Const32 [0]) _)
// cond:
// result: (Const32 [0])
for {
if v.Args[0].Op != OpConst32 {
break
}
if v.Args[0].AuxInt != 0 {
break
}
v.reset(OpConst32)
v.AuxInt = 0
return true
}
// match: (Lsh32x64 x (Const64 [0]))
// cond:
// result: x
@ -3298,7 +3326,7 @@ func rewriteValuegeneric_OpLsh32x64(v *Value, config *Config) bool {
}
// match: (Lsh32x64 _ (Const64 [c]))
// cond: uint64(c) >= 32
// result: (Const64 [0])
// result: (Const32 [0])
for {
if v.Args[1].Op != OpConst64 {
break
@ -3307,7 +3335,7 @@ func rewriteValuegeneric_OpLsh32x64(v *Value, config *Config) bool {
if !(uint64(c) >= 32) {
break
}
v.reset(OpConst64)
v.reset(OpConst32)
v.AuxInt = 0
return true
}
@ -3453,6 +3481,20 @@ func rewriteValuegeneric_OpLsh64x64(v *Value, config *Config) bool {
v.AuxInt = c << uint64(d)
return true
}
// match: (Lsh64x64 (Const64 [0]) _)
// cond:
// result: (Const64 [0])
for {
if v.Args[0].Op != OpConst64 {
break
}
if v.Args[0].AuxInt != 0 {
break
}
v.reset(OpConst64)
v.AuxInt = 0
return true
}
// match: (Lsh64x64 x (Const64 [0]))
// cond:
// result: x
@ -3626,6 +3668,20 @@ func rewriteValuegeneric_OpLsh8x64(v *Value, config *Config) bool {
v.AuxInt = int64(int8(c) << uint64(d))
return true
}
// match: (Lsh8x64 (Const8 [0]) _)
// cond:
// result: (Const8 [0])
for {
if v.Args[0].Op != OpConst8 {
break
}
if v.Args[0].AuxInt != 0 {
break
}
v.reset(OpConst8)
v.AuxInt = 0
return true
}
// match: (Lsh8x64 x (Const64 [0]))
// cond:
// result: x
@ -3644,7 +3700,7 @@ func rewriteValuegeneric_OpLsh8x64(v *Value, config *Config) bool {
}
// match: (Lsh8x64 _ (Const64 [c]))
// cond: uint64(c) >= 8
// result: (Const64 [0])
// result: (Const8 [0])
for {
if v.Args[1].Op != OpConst64 {
break
@ -3653,7 +3709,7 @@ func rewriteValuegeneric_OpLsh8x64(v *Value, config *Config) bool {
if !(uint64(c) >= 8) {
break
}
v.reset(OpConst64)
v.reset(OpConst8)
v.AuxInt = 0
return true
}
@ -4979,6 +5035,20 @@ func rewriteValuegeneric_OpRsh16Ux64(v *Value, config *Config) bool {
v.AuxInt = int64(uint16(c) >> uint64(d))
return true
}
// match: (Rsh16Ux64 (Const16 [0]) _)
// cond:
// result: (Const16 [0])
for {
if v.Args[0].Op != OpConst16 {
break
}
if v.Args[0].AuxInt != 0 {
break
}
v.reset(OpConst16)
v.AuxInt = 0
return true
}
// match: (Rsh16Ux64 x (Const64 [0]))
// cond:
// result: x
@ -4997,7 +5067,7 @@ func rewriteValuegeneric_OpRsh16Ux64(v *Value, config *Config) bool {
}
// match: (Rsh16Ux64 _ (Const64 [c]))
// cond: uint64(c) >= 16
// result: (Const64 [0])
// result: (Const16 [0])
for {
if v.Args[1].Op != OpConst64 {
break
@ -5006,7 +5076,7 @@ func rewriteValuegeneric_OpRsh16Ux64(v *Value, config *Config) bool {
if !(uint64(c) >= 16) {
break
}
v.reset(OpConst64)
v.reset(OpConst16)
v.AuxInt = 0
return true
}
@ -5124,6 +5194,20 @@ func rewriteValuegeneric_OpRsh16x64(v *Value, config *Config) bool {
v.AuxInt = int64(int16(c) >> uint64(d))
return true
}
// match: (Rsh16x64 (Const16 [0]) _)
// cond:
// result: (Const16 [0])
for {
if v.Args[0].Op != OpConst16 {
break
}
if v.Args[0].AuxInt != 0 {
break
}
v.reset(OpConst16)
v.AuxInt = 0
return true
}
// match: (Rsh16x64 x (Const64 [0]))
// cond:
// result: x
@ -5254,6 +5338,20 @@ func rewriteValuegeneric_OpRsh32Ux64(v *Value, config *Config) bool {
v.AuxInt = int64(uint32(c) >> uint64(d))
return true
}
// match: (Rsh32Ux64 (Const32 [0]) _)
// cond:
// result: (Const32 [0])
for {
if v.Args[0].Op != OpConst32 {
break
}
if v.Args[0].AuxInt != 0 {
break
}
v.reset(OpConst32)
v.AuxInt = 0
return true
}
// match: (Rsh32Ux64 x (Const64 [0]))
// cond:
// result: x
@ -5272,7 +5370,7 @@ func rewriteValuegeneric_OpRsh32Ux64(v *Value, config *Config) bool {
}
// match: (Rsh32Ux64 _ (Const64 [c]))
// cond: uint64(c) >= 32
// result: (Const64 [0])
// result: (Const32 [0])
for {
if v.Args[1].Op != OpConst64 {
break
@ -5281,7 +5379,7 @@ func rewriteValuegeneric_OpRsh32Ux64(v *Value, config *Config) bool {
if !(uint64(c) >= 32) {
break
}
v.reset(OpConst64)
v.reset(OpConst32)
v.AuxInt = 0
return true
}
@ -5399,6 +5497,20 @@ func rewriteValuegeneric_OpRsh32x64(v *Value, config *Config) bool {
v.AuxInt = int64(int32(c) >> uint64(d))
return true
}
// match: (Rsh32x64 (Const32 [0]) _)
// cond:
// result: (Const32 [0])
for {
if v.Args[0].Op != OpConst32 {
break
}
if v.Args[0].AuxInt != 0 {
break
}
v.reset(OpConst32)
v.AuxInt = 0
return true
}
// match: (Rsh32x64 x (Const64 [0]))
// cond:
// result: x
@ -5557,6 +5669,20 @@ func rewriteValuegeneric_OpRsh64Ux64(v *Value, config *Config) bool {
v.AuxInt = int64(uint64(c) >> uint64(d))
return true
}
// match: (Rsh64Ux64 (Const64 [0]) _)
// cond:
// result: (Const64 [0])
for {
if v.Args[0].Op != OpConst64 {
break
}
if v.Args[0].AuxInt != 0 {
break
}
v.reset(OpConst64)
v.AuxInt = 0
return true
}
// match: (Rsh64Ux64 x (Const64 [0]))
// cond:
// result: x
@ -5758,6 +5884,20 @@ func rewriteValuegeneric_OpRsh64x64(v *Value, config *Config) bool {
v.AuxInt = c >> uint64(d)
return true
}
// match: (Rsh64x64 (Const64 [0]) _)
// cond:
// result: (Const64 [0])
for {
if v.Args[0].Op != OpConst64 {
break
}
if v.Args[0].AuxInt != 0 {
break
}
v.reset(OpConst64)
v.AuxInt = 0
return true
}
// match: (Rsh64x64 x (Const64 [0]))
// cond:
// result: x
@ -5916,6 +6056,20 @@ func rewriteValuegeneric_OpRsh8Ux64(v *Value, config *Config) bool {
v.AuxInt = int64(uint8(c) >> uint64(d))
return true
}
// match: (Rsh8Ux64 (Const8 [0]) _)
// cond:
// result: (Const8 [0])
for {
if v.Args[0].Op != OpConst8 {
break
}
if v.Args[0].AuxInt != 0 {
break
}
v.reset(OpConst8)
v.AuxInt = 0
return true
}
// match: (Rsh8Ux64 x (Const64 [0]))
// cond:
// result: x
@ -5934,7 +6088,7 @@ func rewriteValuegeneric_OpRsh8Ux64(v *Value, config *Config) bool {
}
// match: (Rsh8Ux64 _ (Const64 [c]))
// cond: uint64(c) >= 8
// result: (Const64 [0])
// result: (Const8 [0])
for {
if v.Args[1].Op != OpConst64 {
break
@ -5943,7 +6097,7 @@ func rewriteValuegeneric_OpRsh8Ux64(v *Value, config *Config) bool {
if !(uint64(c) >= 8) {
break
}
v.reset(OpConst64)
v.reset(OpConst8)
v.AuxInt = 0
return true
}
@ -6061,6 +6215,20 @@ func rewriteValuegeneric_OpRsh8x64(v *Value, config *Config) bool {
v.AuxInt = int64(int8(c) >> uint64(d))
return true
}
// match: (Rsh8x64 (Const8 [0]) _)
// cond:
// result: (Const8 [0])
for {
if v.Args[0].Op != OpConst8 {
break
}
if v.Args[0].AuxInt != 0 {
break
}
v.reset(OpConst8)
v.AuxInt = 0
return true
}
// match: (Rsh8x64 x (Const64 [0]))
// cond:
// result: x