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[dev.ssa] cmd/compile: mark LEA and MOV instructions as not clobbering flags

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This further reduces the number of flags spills
during make.bash by about 50%.

Note that GetG is implemented by one or two MOVs,
which is why it does not clobber flags.

Change-Id: I6fede8c027b7dc340e00d1e15df1b87bf2b2d9ec
Reviewed-on: https://go-review.googlesource.com/13843
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Josh Bleecher Snyder 2015-08-22 09:52:36 -07:00
parent 220e705404
commit f3171994e9
2 changed files with 10 additions and 25 deletions
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19
src/cmd/compile/internal/ssa/gen/AMD64Ops.go
View File

@ -93,11 +93,12 @@ func init() {
// Common regInfo
var (
gp01 = regInfo{inputs: []regMask{}, outputs: gponly, clobbers: flags}
gp01 = regInfo{inputs: []regMask{}, outputs: gponly}
gp11 = regInfo{inputs: []regMask{gpsp}, outputs: gponly, clobbers: flags}
gp11sb = regInfo{inputs: []regMask{gpspsb}, outputs: gponly, clobbers: flags}
gp11nf = regInfo{inputs: []regMask{gpsp}, outputs: gponly} // nf: no flags clobbered
gp11sb = regInfo{inputs: []regMask{gpspsb}, outputs: gponly}
gp21 = regInfo{inputs: []regMask{gpsp, gpsp}, outputs: gponly, clobbers: flags}
gp21sb = regInfo{inputs: []regMask{gpspsb, gpsp}, outputs: gponly, clobbers: flags}
gp21sb = regInfo{inputs: []regMask{gpspsb, gpsp}, outputs: gponly}
gp21shift = regInfo{inputs: []regMask{gpsp, cx}, outputs: []regMask{gp &^ cx}, clobbers: flags}
gp11div = regInfo{inputs: []regMask{ax, gpsp &^ dx}, outputs: []regMask{ax},
clobbers: dx | flags}
@ -315,12 +316,12 @@ func init() {
{name: "SETA", reg: readflags, asm: "SETHI"}, // extract unsigned > condition from arg0
{name: "SETAE", reg: readflags, asm: "SETCC"}, // extract unsigned >= condition from arg0
{name: "MOVBQSX", reg: gp11, asm: "MOVBQSX"}, // sign extend arg0 from int8 to int64
{name: "MOVBQZX", reg: gp11, asm: "MOVBQZX"}, // zero extend arg0 from int8 to int64
{name: "MOVWQSX", reg: gp11, asm: "MOVWQSX"}, // sign extend arg0 from int16 to int64
{name: "MOVWQZX", reg: gp11, asm: "MOVWQZX"}, // zero extend arg0 from int16 to int64
{name: "MOVLQSX", reg: gp11, asm: "MOVLQSX"}, // sign extend arg0 from int32 to int64
{name: "MOVLQZX", reg: gp11, asm: "MOVLQZX"}, // zero extend arg0 from int32 to int64
{name: "MOVBQSX", reg: gp11nf, asm: "MOVBQSX"}, // sign extend arg0 from int8 to int64
{name: "MOVBQZX", reg: gp11nf, asm: "MOVBQZX"}, // zero extend arg0 from int8 to int64
{name: "MOVWQSX", reg: gp11nf, asm: "MOVWQSX"}, // sign extend arg0 from int16 to int64
{name: "MOVWQZX", reg: gp11nf, asm: "MOVWQZX"}, // zero extend arg0 from int16 to int64
{name: "MOVLQSX", reg: gp11nf, asm: "MOVLQSX"}, // sign extend arg0 from int32 to int64
{name: "MOVLQZX", reg: gp11nf, asm: "MOVLQZX"}, // zero extend arg0 from int32 to int64
{name: "MOVBconst", reg: gp01, asm: "MOVB"}, // 8 low bits of auxint
{name: "MOVWconst", reg: gp01, asm: "MOVW"}, // 16 low bits of auxint

16
src/cmd/compile/internal/ssa/opGen.go
View File

@ -2261,7 +2261,6 @@ var opcodeTable = [...]opInfo{
inputs: []inputInfo{
{0, 65535}, // .AX .CX .DX .BX .SP .BP .SI .DI .R8 .R9 .R10 .R11 .R12 .R13 .R14 .R15
},
clobbers: 8589934592, // .FLAGS
outputs: []regMask{
65519, // .AX .CX .DX .BX .BP .SI .DI .R8 .R9 .R10 .R11 .R12 .R13 .R14 .R15
},
@ -2420,7 +2419,6 @@ var opcodeTable = [...]opInfo{
inputs: []inputInfo{
{0, 65535}, // .AX .CX .DX .BX .SP .BP .SI .DI .R8 .R9 .R10 .R11 .R12 .R13 .R14 .R15
},
clobbers: 8589934592, // .FLAGS
outputs: []regMask{
65519, // .AX .CX .DX .BX .BP .SI .DI .R8 .R9 .R10 .R11 .R12 .R13 .R14 .R15
},
@ -2433,7 +2431,6 @@ var opcodeTable = [...]opInfo{
inputs: []inputInfo{
{0, 65535}, // .AX .CX .DX .BX .SP .BP .SI .DI .R8 .R9 .R10 .R11 .R12 .R13 .R14 .R15
},
clobbers: 8589934592, // .FLAGS
outputs: []regMask{
65519, // .AX .CX .DX .BX .BP .SI .DI .R8 .R9 .R10 .R11 .R12 .R13 .R14 .R15
},
@ -2446,7 +2443,6 @@ var opcodeTable = [...]opInfo{
inputs: []inputInfo{
{0, 65535}, // .AX .CX .DX .BX .SP .BP .SI .DI .R8 .R9 .R10 .R11 .R12 .R13 .R14 .R15
},
clobbers: 8589934592, // .FLAGS
outputs: []regMask{
65519, // .AX .CX .DX .BX .BP .SI .DI .R8 .R9 .R10 .R11 .R12 .R13 .R14 .R15
},
@ -2459,7 +2455,6 @@ var opcodeTable = [...]opInfo{
inputs: []inputInfo{
{0, 65535}, // .AX .CX .DX .BX .SP .BP .SI .DI .R8 .R9 .R10 .R11 .R12 .R13 .R14 .R15
},
clobbers: 8589934592, // .FLAGS
outputs: []regMask{
65519, // .AX .CX .DX .BX .BP .SI .DI .R8 .R9 .R10 .R11 .R12 .R13 .R14 .R15
},
@ -2472,7 +2467,6 @@ var opcodeTable = [...]opInfo{
inputs: []inputInfo{
{0, 65535}, // .AX .CX .DX .BX .SP .BP .SI .DI .R8 .R9 .R10 .R11 .R12 .R13 .R14 .R15
},
clobbers: 8589934592, // .FLAGS
outputs: []regMask{
65519, // .AX .CX .DX .BX .BP .SI .DI .R8 .R9 .R10 .R11 .R12 .R13 .R14 .R15
},
@ -2495,7 +2489,6 @@ var opcodeTable = [...]opInfo{
name: "MOVBconst",
asm: x86.AMOVB,
reg: regInfo{
clobbers: 8589934592, // .FLAGS
outputs: []regMask{
65519, // .AX .CX .DX .BX .BP .SI .DI .R8 .R9 .R10 .R11 .R12 .R13 .R14 .R15
},
@ -2505,7 +2498,6 @@ var opcodeTable = [...]opInfo{
name: "MOVWconst",
asm: x86.AMOVW,
reg: regInfo{
clobbers: 8589934592, // .FLAGS
outputs: []regMask{
65519, // .AX .CX .DX .BX .BP .SI .DI .R8 .R9 .R10 .R11 .R12 .R13 .R14 .R15
},
@ -2515,7 +2507,6 @@ var opcodeTable = [...]opInfo{
name: "MOVLconst",
asm: x86.AMOVL,
reg: regInfo{
clobbers: 8589934592, // .FLAGS
outputs: []regMask{
65519, // .AX .CX .DX .BX .BP .SI .DI .R8 .R9 .R10 .R11 .R12 .R13 .R14 .R15
},
@ -2525,7 +2516,6 @@ var opcodeTable = [...]opInfo{
name: "MOVQconst",
asm: x86.AMOVQ,
reg: regInfo{
clobbers: 8589934592, // .FLAGS
outputs: []regMask{
65519, // .AX .CX .DX .BX .BP .SI .DI .R8 .R9 .R10 .R11 .R12 .R13 .R14 .R15
},
@ -2537,7 +2527,6 @@ var opcodeTable = [...]opInfo{
inputs: []inputInfo{
{0, 4295032831}, // .AX .CX .DX .BX .SP .BP .SI .DI .R8 .R9 .R10 .R11 .R12 .R13 .R14 .R15 .SB
},
clobbers: 8589934592, // .FLAGS
outputs: []regMask{
65519, // .AX .CX .DX .BX .BP .SI .DI .R8 .R9 .R10 .R11 .R12 .R13 .R14 .R15
},
@ -2550,7 +2539,6 @@ var opcodeTable = [...]opInfo{
{1, 65535}, // .AX .CX .DX .BX .SP .BP .SI .DI .R8 .R9 .R10 .R11 .R12 .R13 .R14 .R15
{0, 4295032831}, // .AX .CX .DX .BX .SP .BP .SI .DI .R8 .R9 .R10 .R11 .R12 .R13 .R14 .R15 .SB
},
clobbers: 8589934592, // .FLAGS
outputs: []regMask{
65519, // .AX .CX .DX .BX .BP .SI .DI .R8 .R9 .R10 .R11 .R12 .R13 .R14 .R15
},
@ -2563,7 +2551,6 @@ var opcodeTable = [...]opInfo{
{1, 65535}, // .AX .CX .DX .BX .SP .BP .SI .DI .R8 .R9 .R10 .R11 .R12 .R13 .R14 .R15
{0, 4295032831}, // .AX .CX .DX .BX .SP .BP .SI .DI .R8 .R9 .R10 .R11 .R12 .R13 .R14 .R15 .SB
},
clobbers: 8589934592, // .FLAGS
outputs: []regMask{
65519, // .AX .CX .DX .BX .BP .SI .DI .R8 .R9 .R10 .R11 .R12 .R13 .R14 .R15
},
@ -2576,7 +2563,6 @@ var opcodeTable = [...]opInfo{
{1, 65535}, // .AX .CX .DX .BX .SP .BP .SI .DI .R8 .R9 .R10 .R11 .R12 .R13 .R14 .R15
{0, 4295032831}, // .AX .CX .DX .BX .SP .BP .SI .DI .R8 .R9 .R10 .R11 .R12 .R13 .R14 .R15 .SB
},
clobbers: 8589934592, // .FLAGS
outputs: []regMask{
65519, // .AX .CX .DX .BX .BP .SI .DI .R8 .R9 .R10 .R11 .R12 .R13 .R14 .R15
},
@ -2589,7 +2575,6 @@ var opcodeTable = [...]opInfo{
{1, 65535}, // .AX .CX .DX .BX .SP .BP .SI .DI .R8 .R9 .R10 .R11 .R12 .R13 .R14 .R15
{0, 4295032831}, // .AX .CX .DX .BX .SP .BP .SI .DI .R8 .R9 .R10 .R11 .R12 .R13 .R14 .R15 .SB
},
clobbers: 8589934592, // .FLAGS
outputs: []regMask{
65519, // .AX .CX .DX .BX .BP .SI .DI .R8 .R9 .R10 .R11 .R12 .R13 .R14 .R15
},
@ -2799,7 +2784,6 @@ var opcodeTable = [...]opInfo{
{
name: "LoweredGetG",
reg: regInfo{
clobbers: 8589934592, // .FLAGS
outputs: []regMask{
65519, // .AX .CX .DX .BX .BP .SI .DI .R8 .R9 .R10 .R11 .R12 .R13 .R14 .R15
},