qbit/go
1
0
Fork 0
mirror of https://github.com/golang/go synced 2024-11-22 22:20:03 -07:00
Code Releases Activity

cmd/8g: extend elimination of temporaries to SSE2 code.

Browse Source 
Before:
(erf.go:188)    TEXT     Erf+0(SB),$220
(erf.go:265)    TEXT     Erfc+0(SB),$204
(lgamma.go:174) TEXT     Lgamma+0(SB),$948

After:
(erf.go:188)    TEXT     Erf+0(SB),$84
(erf.go:265)    TEXT     Erfc+0(SB),$84
(lgamma.go:174) TEXT     Lgamma+0(SB),$44

SSE before vs. SSE after:

benchmark             old ns/op    new ns/op    delta
BenchmarkAcosh               81           49  -39.14%
BenchmarkAsinh              109          109   +0.00%
BenchmarkAtanh               73           74   +0.68%
BenchmarkLgamma             138           42  -69.20%
BenchmarkModf                24           15  -36.95%
BenchmarkSqrtGo             565          556   -1.59%

R=rsc
CC=golang-dev
https://golang.org/cl/7028048
This commit is contained in:
Rémy Oudompheng 2013-01-03 00:44:31 +01:00
parent 5e46d540c8
commit cf77dd37e7
1 changed files with 26 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
src/cmd/8g/reg.c
View File

@ -1845,26 +1845,33 @@ fixtemp(Prog *firstp)
for(p=firstp; p!=P; p=p->link) {
if(debug['R'] && debug['v'])
print("%P\n", p);
if(p->link == P
|| !RtoB(p->from.type)
|| p->to.type != D_AUTO
|| isfloat[p->to.etype])
if(p->link == P || p->to.type != D_AUTO)
continue;
switch(p->as) {
case AMOVB:
if(p->to.width == 1)
if(isfloat[p->to.etype] && FtoB(p->from.type)) {
switch(p->as) {
case AMOVSS:
case AMOVSD:
break;
case AMOVW:
if(p->to.width == 2)
break;
case AMOVL:
if(p->to.width == 4)
break;
default:
default:
continue;
}
} else if(!isfloat[p->to.etype] && RtoB(p->from.type)) {
switch(p->as) {
case AMOVB:
if(p->to.width == 1)
break;
case AMOVW:
if(p->to.width == 2)
break;
case AMOVL:
if(p->to.width == 4)
break;
default:
continue;
}
} else
continue;
}
// p is a MOV reg, mem.
// and it is not a float.
p2 = p->link;
h = hash32to16(fnv1(p->to.sym));
if(counts[h] != 2) {
@ -1872,7 +1879,9 @@ fixtemp(Prog *firstp)
}
switch(p2->as) {
case ALEAL:
case AFMOVL:
case AFMOVD:
case AFMOVF:
case AFMOVL:
case AFMOVW:
case AFMOVV:
// funny