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cgen64: dont use MVN instruction

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R=r
CC=golang-dev
https://golang.org/cl/4154043
This commit is contained in:
Ken Thompson 2011-02-08 17:30:23 -08:00
parent dc331e6565
commit 5080d7617a
2 changed files with 24 additions and 20 deletions
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8
src/cmd/5g/cgen64.c
View File

@ -64,17 +64,21 @@ cgen64(Node *n, Node *res)
return;
case OCOM:
regalloc(&t1, lo1.type, N);
gmove(ncon(-1), &t1);
split64(res, &lo2, &hi2);
regalloc(&n1, lo1.type, N);
gins(AMOVW, &lo1, &n1);
gins(AMVN, &n1, &n1);
gins(AEOR, &t1, &n1);
gins(AMOVW, &n1, &lo2);
gins(AMOVW, &hi1, &n1);
gins(AMVN, &n1, &n1);
gins(AEOR, &t1, &n1);
gins(AMOVW, &n1, &hi2);
regfree(&t1);
regfree(&n1);
splitclean();
splitclean();

36
src/cmd/5g/peep.c
View File

@ -133,20 +133,20 @@ loop1:
switch(p->as) {
default:
continue;
case AEOR:
/*
* EOR -1,x,y => MVN x,y
*/
if(isdconst(&p->from) && p->from.offset == -1) {
p->as = AMVN;
p->from.type = D_REG;
if(p->reg != NREG)
p->from.reg = p->reg;
else
p->from.reg = p->to.reg;
p->reg = NREG;
}
continue;
// case AEOR:
// /*
// * EOR -1,x,y => MVN x,y
// */
// if(isdconst(&p->from) && p->from.offset == -1) {
// p->as = AMVN;
// p->from.type = D_REG;
// if(p->reg != NREG)
// p->from.reg = p->reg;
// else
// p->from.reg = p->to.reg;
// p->reg = NREG;
// }
// continue;
case AMOVH:
case AMOVHU:
case AMOVB:
@ -337,7 +337,7 @@ subprop(Reg *r0)
case AMULLU:
case AMULA:
case AMVN:
// case AMVN:
case ACMN:
case AADD:
@ -666,7 +666,7 @@ shiftprop(Reg *r)
FAIL("can't swap");
if(p1->reg == NREG && p1->to.reg == n)
FAIL("shift result used twice");
case AMVN:
// case AMVN:
if(p1->from.type == D_SHIFT)
FAIL("shift result used in shift");
if(p1->from.type != D_REG || p1->from.reg != n)
@ -1018,7 +1018,7 @@ copyu(Prog *p, Adr *v, Adr *s)
case AMULLU: /* read, read, write, write */
case AMULA:
case AMVN:
// case AMVN:
return 2;
case AADD: /* read, read, write */
@ -1176,7 +1176,7 @@ a2type(Prog *p)
case AORR:
case AAND:
case AEOR:
case AMVN:
// case AMVN:
case AMUL:
case AMULU:
case ADIV: