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cmd/compile: optimize 386's assembly generator

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The ADDconstmodify has similar logic with other constmodify like
instructions. This CL optimize them to share code via fallthrough.
And the size of pkg/linux_386/cmd/compile/internal/x86.a decreases
about 0.3KB.

Change-Id: Ibdf06228afde875e8fe8e30851b50ca2be513dd9
Reviewed-on: https://go-review.googlesource.com/136398
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Ben Shi 2018-09-20 01:26:17 +00:00
parent 048c766e66
commit 9a033bf9d3
1 changed files with 13 additions and 13 deletions
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26
src/cmd/compile/internal/x86/ssa.go
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@ -547,22 +547,22 @@ func ssaGenValue(s *gc.SSAGenState, v *ssa.Value) {
p.To.Reg = v.Args[0].Reg()
gc.AddAux(&p.To, v)
case ssa.Op386ADDLconstmodify:
var p *obj.Prog = nil
sc := v.AuxValAndOff()
off := sc.Off()
val := sc.Val()
if val == 1 {
p = s.Prog(x86.AINCL)
} else if val == -1 {
p = s.Prog(x86.ADECL)
} else {
p = s.Prog(v.Op.Asm())
p.From.Type = obj.TYPE_CONST
p.From.Offset = val
if val == 1 || val == -1 {
var p *obj.Prog
if val == 1 {
p = s.Prog(x86.AINCL)
} else {
p = s.Prog(x86.ADECL)
}
off := sc.Off()
p.To.Type = obj.TYPE_MEM
p.To.Reg = v.Args[0].Reg()
gc.AddAux2(&p.To, v, off)
break
}
p.To.Type = obj.TYPE_MEM
p.To.Reg = v.Args[0].Reg()
gc.AddAux2(&p.To, v, off)
fallthrough
case ssa.Op386ANDLconstmodify, ssa.Op386ORLconstmodify, ssa.Op386XORLconstmodify:
sc := v.AuxValAndOff()
off := sc.Off()