Stowage/go
2
0
Fork 0
mirror of https://github.com/golang/go.git synced 2025-12-08 06:10:04 +00:00
Code Issues Projects Releases Packages Wiki Activity

cmd/compile: remove ntz function

Browse source 
Use ntzX variants instead.

Passes toolstash-check -a.

Change-Id: I7a627f46f75c3d339034bd3e81c190cea5409c88
Reviewed-on: https://go-review.googlesource.com/c/go/+/229140
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Cuong Manh Le 2020-04-22 00:52:19 +07:00
parent b71eafbcec
commit 79395c55e2
3 changed files with 25 additions and 26 deletions
Download patch file Download diff file Expand all files Collapse all files

16
src/cmd/compile/internal/ssa/gen/ARM64.rules
View file

@ -672,14 +672,14 @@
(GT (CMPWconst [0] z:(MSUBW a x y)) yes no) && z.Uses==1 -> (GT (CMPW a (MULW <x.Type> x y)) yes no)
// Absorb bit-tests into block
(Z (ANDconst [c] x) yes no) && oneBit(c) -> (TBZ {ntz(c)} x yes no)
(NZ (ANDconst [c] x) yes no) && oneBit(c) -> (TBNZ {ntz(c)} x yes no)
(ZW (ANDconst [c] x) yes no) && oneBit(int64(uint32(c))) -> (TBZ {ntz(int64(uint32(c)))} x yes no)
(NZW (ANDconst [c] x) yes no) && oneBit(int64(uint32(c))) -> (TBNZ {ntz(int64(uint32(c)))} x yes no)
(EQ (TSTconst [c] x) yes no) && oneBit(c) -> (TBZ {ntz(c)} x yes no)
(NE (TSTconst [c] x) yes no) && oneBit(c) -> (TBNZ {ntz(c)} x yes no)
(EQ (TSTWconst [c] x) yes no) && oneBit(int64(uint32(c))) -> (TBZ {ntz(int64(uint32(c)))} x yes no)
(NE (TSTWconst [c] x) yes no) && oneBit(int64(uint32(c))) -> (TBNZ {ntz(int64(uint32(c)))} x yes no)
(Z (ANDconst [c] x) yes no) && oneBit(c) -> (TBZ {int64(ntz64(c))} x yes no)
(NZ (ANDconst [c] x) yes no) && oneBit(c) -> (TBNZ {int64(ntz64(c))} x yes no)
(ZW (ANDconst [c] x) yes no) && oneBit(int64(uint32(c))) -> (TBZ {int64(ntz64(int64(uint32(c))))} x yes no)
(NZW (ANDconst [c] x) yes no) && oneBit(int64(uint32(c))) -> (TBNZ {int64(ntz64(int64(uint32(c))))} x yes no)
(EQ (TSTconst [c] x) yes no) && oneBit(c) -> (TBZ {int64(ntz64(c))} x yes no)
(NE (TSTconst [c] x) yes no) && oneBit(c) -> (TBNZ {int64(ntz64(c))} x yes no)
(EQ (TSTWconst [c] x) yes no) && oneBit(int64(uint32(c))) -> (TBZ {int64(ntz64(int64(uint32(c))))} x yes no)
(NE (TSTWconst [c] x) yes no) && oneBit(int64(uint32(c))) -> (TBNZ {int64(ntz64(int64(uint32(c))))} x yes no)
// Test sign-bit for signed comparisons against zero
(GE (CMPWconst [0] x) yes no) -> (TBZ {int64(31)} x yes no)

3
src/cmd/compile/internal/ssa/rewrite.go
View file

@ -392,7 +392,6 @@ func nlz16(x int16) int { return bits.LeadingZeros16(uint16(x)) }
func nlz8(x int8) int { return bits.LeadingZeros8(uint8(x)) }
// ntzX returns the number of trailing zeros.
func ntz(x int64) int64 { return int64(bits.TrailingZeros64(uint64(x))) } // TODO: remove when no longer used
func ntz64(x int64) int { return bits.TrailingZeros64(uint64(x)) }
func ntz32(x int32) int { return bits.TrailingZeros32(uint32(x)) }
func ntz16(x int16) int { return bits.TrailingZeros16(uint16(x)) }
@ -406,7 +405,7 @@ func oneBit64(x int64) bool { return x&(x-1) == 0 && x != 0 }
// nto returns the number of trailing ones.
func nto(x int64) int64 {
return ntz(^x)
return int64(ntz64(^x))
}
// log2 returns logarithm in base 2 of uint64(n), with log2(0) = -1.

32
src/cmd/compile/internal/ssa/rewriteARM64.go
View file

@ -26073,7 +26073,7 @@ func rewriteBlockARM64(b *Block) bool {
}
// match: (EQ (TSTconst [c] x) yes no)
// cond: oneBit(c)
// result: (TBZ {ntz(c)} x yes no)
// result: (TBZ {int64(ntz64(c))} x yes no)
for b.Controls[0].Op == OpARM64TSTconst {
v_0 := b.Controls[0]
c := v_0.AuxInt
@ -26082,12 +26082,12 @@ func rewriteBlockARM64(b *Block) bool {
break
}
b.resetWithControl(BlockARM64TBZ, x)
b.Aux = ntz(c)
b.Aux = int64(ntz64(c))
return true
}
// match: (EQ (TSTWconst [c] x) yes no)
// cond: oneBit(int64(uint32(c)))
// result: (TBZ {ntz(int64(uint32(c)))} x yes no)
// result: (TBZ {int64(ntz64(int64(uint32(c))))} x yes no)
for b.Controls[0].Op == OpARM64TSTWconst {
v_0 := b.Controls[0]
c := v_0.AuxInt
@ -26096,7 +26096,7 @@ func rewriteBlockARM64(b *Block) bool {
break
}
b.resetWithControl(BlockARM64TBZ, x)
b.Aux = ntz(int64(uint32(c)))
b.Aux = int64(ntz64(int64(uint32(c))))
return true
}
// match: (EQ (FlagEQ) yes no)
@ -28256,7 +28256,7 @@ func rewriteBlockARM64(b *Block) bool {
}
// match: (NE (TSTconst [c] x) yes no)
// cond: oneBit(c)
// result: (TBNZ {ntz(c)} x yes no)
// result: (TBNZ {int64(ntz64(c))} x yes no)
for b.Controls[0].Op == OpARM64TSTconst {
v_0 := b.Controls[0]
c := v_0.AuxInt
@ -28265,12 +28265,12 @@ func rewriteBlockARM64(b *Block) bool {
break
}
b.resetWithControl(BlockARM64TBNZ, x)
b.Aux = ntz(c)
b.Aux = int64(ntz64(c))
return true
}
// match: (NE (TSTWconst [c] x) yes no)
// cond: oneBit(int64(uint32(c)))
// result: (TBNZ {ntz(int64(uint32(c)))} x yes no)
// result: (TBNZ {int64(ntz64(int64(uint32(c))))} x yes no)
for b.Controls[0].Op == OpARM64TSTWconst {
v_0 := b.Controls[0]
c := v_0.AuxInt
@ -28279,7 +28279,7 @@ func rewriteBlockARM64(b *Block) bool {
break
}
b.resetWithControl(BlockARM64TBNZ, x)
b.Aux = ntz(int64(uint32(c)))
b.Aux = int64(ntz64(int64(uint32(c))))
return true
}
// match: (NE (FlagEQ) yes no)
@ -28436,7 +28436,7 @@ func rewriteBlockARM64(b *Block) bool {
}
// match: (NZ (ANDconst [c] x) yes no)
// cond: oneBit(c)
// result: (TBNZ {ntz(c)} x yes no)
// result: (TBNZ {int64(ntz64(c))} x yes no)
for b.Controls[0].Op == OpARM64ANDconst {
v_0 := b.Controls[0]
c := v_0.AuxInt
@ -28445,7 +28445,7 @@ func rewriteBlockARM64(b *Block) bool {
break
}
b.resetWithControl(BlockARM64TBNZ, x)
b.Aux = ntz(c)
b.Aux = int64(ntz64(c))
return true
}
// match: (NZ (MOVDconst [0]) yes no)
@ -28474,7 +28474,7 @@ func rewriteBlockARM64(b *Block) bool {
case BlockARM64NZW:
// match: (NZW (ANDconst [c] x) yes no)
// cond: oneBit(int64(uint32(c)))
// result: (TBNZ {ntz(int64(uint32(c)))} x yes no)
// result: (TBNZ {int64(ntz64(int64(uint32(c))))} x yes no)
for b.Controls[0].Op == OpARM64ANDconst {
v_0 := b.Controls[0]
c := v_0.AuxInt
@ -28483,7 +28483,7 @@ func rewriteBlockARM64(b *Block) bool {
break
}
b.resetWithControl(BlockARM64TBNZ, x)
b.Aux = ntz(int64(uint32(c)))
b.Aux = int64(ntz64(int64(uint32(c))))
return true
}
// match: (NZW (MOVDconst [c]) yes no)
@ -28680,7 +28680,7 @@ func rewriteBlockARM64(b *Block) bool {
case BlockARM64Z:
// match: (Z (ANDconst [c] x) yes no)
// cond: oneBit(c)
// result: (TBZ {ntz(c)} x yes no)
// result: (TBZ {int64(ntz64(c))} x yes no)
for b.Controls[0].Op == OpARM64ANDconst {
v_0 := b.Controls[0]
c := v_0.AuxInt
@ -28689,7 +28689,7 @@ func rewriteBlockARM64(b *Block) bool {
break
}
b.resetWithControl(BlockARM64TBZ, x)
b.Aux = ntz(c)
b.Aux = int64(ntz64(c))
return true
}
// match: (Z (MOVDconst [0]) yes no)
@ -28718,7 +28718,7 @@ func rewriteBlockARM64(b *Block) bool {
case BlockARM64ZW:
// match: (ZW (ANDconst [c] x) yes no)
// cond: oneBit(int64(uint32(c)))
// result: (TBZ {ntz(int64(uint32(c)))} x yes no)
// result: (TBZ {int64(ntz64(int64(uint32(c))))} x yes no)
for b.Controls[0].Op == OpARM64ANDconst {
v_0 := b.Controls[0]
c := v_0.AuxInt
@ -28727,7 +28727,7 @@ func rewriteBlockARM64(b *Block) bool {
break
}
b.resetWithControl(BlockARM64TBZ, x)
b.Aux = ntz(int64(uint32(c)))
b.Aux = int64(ntz64(int64(uint32(c))))
return true
}
// match: (ZW (MOVDconst [c]) yes no)