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better code for += -= ^= |= and &=

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R=r
OCL=19953
CL=19953
This commit is contained in:
Ken Thompson 2008-11-24 17:51:26 -08:00
parent 3489fe958e
commit 9a5c7eab16
1 changed files with 15 additions and 6 deletions
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21
src/cmd/6g/gen.c
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@ -921,26 +921,35 @@ cgen_asop(Node *n)
switch(n->etype) {
case OADD:
if(!isint[nl->type->etype])
goto com;
break;
if(mpgetfix(nr->val.u.xval) != 1)
goto com;
break;
gins(optoas(OINC, nl->type), N, nl);
goto ret;
case OSUB:
if(!isint[nl->type->etype])
goto com;
break;
if(mpgetfix(nr->val.u.xval) != 1)
goto com;
break;
gins(optoas(ODEC, nl->type), N, nl);
goto ret;
}
com:
if(nl->addable)
switch(n->etype) {
case OXOR:
case OAND:
case OOR:
case OADD:
case OSUB:
if(!isint[nl->type->etype])
break;
gins(optoas(n->etype, nl->type), nr, nl);
if(!isint[nr->type->etype])
break;
regalloc(&n2, nr->type, N);
cgen(nr, &n2);
gins(optoas(n->etype, nl->type), &n2, nl);
regfree(&n2);
goto ret;
}