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cmd/compile/internal/ssa: Mark ADD[Q|L]const as rematerializeable

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We can rematerialize only ops that have SP or SB as their only argument.
There are some ADDQconst(SP) that can be rematerialized, but are spilled/filled instead,
so mark addconst as rematerializeable. This shaves ~1kb from go tool.

Change-Id: Ib4cf4fe5f2ec9d3d7e5f0f77f1193eba66ca2f08
Reviewed-on: https://go-review.googlesource.com/54393
Run-TryBot: Ilya Tocar <ilya.tocar@intel.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Ilya Tocar 2017-08-09 13:43:34 -05:00
parent 9afec99dc2
commit 7dd279013b
2 changed files with 14 additions and 12 deletions
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4
src/cmd/compile/internal/ssa/gen/AMD64Ops.go
View File

@ -189,8 +189,8 @@ func init() {
// binary ops
{name: "ADDQ", argLength: 2, reg: gp21sp, asm: "ADDQ", commutative: true, clobberFlags: true}, // arg0 + arg1
{name: "ADDL", argLength: 2, reg: gp21sp, asm: "ADDL", commutative: true, clobberFlags: true}, // arg0 + arg1
{name: "ADDQconst", argLength: 1, reg: gp11sp, asm: "ADDQ", aux: "Int64", typ: "UInt64", clobberFlags: true}, // arg0 + auxint
{name: "ADDLconst", argLength: 1, reg: gp11sp, asm: "ADDL", aux: "Int32", clobberFlags: true}, // arg0 + auxint
{name: "ADDQconst", argLength: 1, reg: gp11sp, asm: "ADDQ", aux: "Int64", typ: "UInt64", clobberFlags: true, rematerializeable: true}, // arg0 + auxint
{name: "ADDLconst", argLength: 1, reg: gp11sp, asm: "ADDL", aux: "Int32", clobberFlags: true, rematerializeable: true}, // arg0 + auxint
{name: "ADDQconstmem", argLength: 2, reg: gpstoreconst, asm: "ADDQ", aux: "SymValAndOff", clobberFlags: true, faultOnNilArg0: true, symEffect: "Write"}, // add ValAndOff(AuxInt).Val() to arg0+ValAndOff(AuxInt).Off()+aux, arg1=mem
{name: "ADDLconstmem", argLength: 2, reg: gpstoreconst, asm: "ADDL", aux: "SymValAndOff", clobberFlags: true, faultOnNilArg0: true, symEffect: "Write"}, // add ValAndOff(AuxInt).Val() to arg0+ValAndOff(AuxInt).Off()+aux, arg1=mem

2
src/cmd/compile/internal/ssa/opGen.go
View File

@ -4852,6 +4852,7 @@ var opcodeTable = [...]opInfo{
name: "ADDQconst",
auxType: auxInt64,
argLen: 1,
rematerializeable: true,
clobberFlags: true,
asm: x86.AADDQ,
reg: regInfo{
@ -4867,6 +4868,7 @@ var opcodeTable = [...]opInfo{
name: "ADDLconst",
auxType: auxInt32,
argLen: 1,
rematerializeable: true,
clobberFlags: true,
asm: x86.AADDL,
reg: regInfo{