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gc: better compilation of floating point +=

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R=ken2
CC=golang-dev
https://golang.org/cl/255042
This commit is contained in:
Russ Cox 2010-03-05 15:35:09 -08:00
parent 8c9944d8c8
commit ac499ed7a5
5 changed files with 63 additions and 31 deletions
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22
src/cmd/5g/ggen.c
View File

@ -479,26 +479,34 @@ cgen_asop(Node *n)
}
hard:
if(nr->ullman > nl->ullman) {
n2.op = 0;
n1.op = 0;
if(nr->ullman >= nl->ullman || nl->addable) {
regalloc(&n2, nr->type, N);
cgen(nr, &n2);
igen(nl, &n1, N);
nr = &n2;
} else {
igen(nl, &n1, N);
regalloc(&n2, nr->type, N);
tempname(&n2, nr->type);
cgen(nr, &n2);
nr = &n2;
}
if(!nl->addable) {
igen(nl, &n1, N);
nl = &n1;
}
n3 = *n;
n3.left = &n1;
n3.right = &n2;
n3.left = nl;
n3.right = nr;
n3.op = n->etype;
regalloc(&n4, nl->type, N);
cgen(&n3, &n4);
gmove(&n4, &n1);
gmove(&n4, nl);
if(n1.op)
regfree(&n1);
if(n2.op == OREGISTER)
regfree(&n2);
regfree(&n4);
goto ret;

22
src/cmd/6g/ggen.c
View File

@ -432,26 +432,34 @@ cgen_asop(Node *n)
}
hard:
if(nr->ullman > nl->ullman) {
n2.op = 0;
n1.op = 0;
if(nr->ullman >= nl->ullman || nl->addable) {
regalloc(&n2, nr->type, N);
cgen(nr, &n2);
igen(nl, &n1, N);
nr = &n2;
} else {
igen(nl, &n1, N);
regalloc(&n2, nr->type, N);
tempname(&n2, nr->type);
cgen(nr, &n2);
nr = &n2;
}
if(!nl->addable) {
igen(nl, &n1, N);
nl = &n1;
}
n3 = *n;
n3.left = &n1;
n3.right = &n2;
n3.left = nl;
n3.right = nr;
n3.op = n->etype;
regalloc(&n4, nl->type, N);
cgen(&n3, &n4);
gmove(&n4, &n1);
gmove(&n4, nl);
if(n1.op)
regfree(&n1);
if(n2.op == OREGISTER)
regfree(&n2);
regfree(&n4);

2
src/cmd/8g/cgen.c
View File

@ -18,7 +18,7 @@ mgen(Node *n, Node *n1, Node *rg)
reg[n->val.u.reg]++;
return;
}
if(n->type->width > widthptr)
if(n->type->width > widthptr && !isfloat[n->type->etype])
tempname(n1, n->type);
else
regalloc(n1, n->type, rg);

25
src/cmd/8g/ggen.c
View File

@ -471,21 +471,34 @@ cgen_asop(Node *n)
}
hard:
n2.op = 0;
n1.op = 0;
if(nr->ullman >= nl->ullman || nl->addable) {
mgen(nr, &n2, N);
nr = &n2;
nr = &n2;
} else {
tempname(&n2, nr->type);
cgen(nr, &n2);
nr = &n2;
}
if(!nl->addable) {
igen(nl, &n1, N);
nl = &n1;
}
n3 = *n;
n3.left = &n1;
n3.right = &n2;
n3.left = nl;
n3.right = nr;
n3.op = n->etype;
tempname(&n4, nl->type);
cgen(&n3, &n4);
gmove(&n4, &n1);
mgen(&n3, &n4, N);
gmove(&n4, nl);
if(n1.op)
regfree(&n1);
mfree(&n2);
mfree(&n4);
ret:
;

7
src/cmd/gc/walk.c
View File

@ -823,10 +823,13 @@ walkexpr(Node **np, NodeList **init)
}
/*
* on 32-bit arch, rewrite 64-bit ops into l = l op r
* on 32-bit arch, rewrite 64-bit ops into l = l op r.
* on 386, rewrite float ops into l = l op r.
* TODO(rsc): Maybe this rewrite should be done always?
*/
et = n->left->type->etype;
if(widthptr == 4 && (et == TUINT64 || et == TINT64)) {
if((widthptr == 4 && (et == TUINT64 || et == TINT64)) ||
(thechar == '8' && isfloat[et])) {
l = safeexpr(n->left, init);
r = nod(OAS, l, nod(n->etype, l, n->right));
typecheck(&r, Etop);