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fix bugs compiling things like

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c = cmplx(imag(c), real(c))
without a temporary

R=rsc
CC=golang-dev
https://golang.org/cl/360043
This commit is contained in:
Ken Thompson 2010-03-09 13:39:45 -08:00
parent f229c8b546
commit 38ad41c317
1 changed files with 13 additions and 6 deletions
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19
src/cmd/gc/cplx.c
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@ -123,7 +123,7 @@ complexgen(Node *n, Node *res)
{
Node *nl, *nr;
Node tnl, tnr;
Node n1, n2;
Node n1, n2, tmp;
int tl, tr;
if(debug['g']) {
@ -135,8 +135,10 @@ complexgen(Node *n, Node *res)
switch(n->op) {
case OCMPLX:
subnode(&n1, &n2, res);
cgen(n->left, &n1);
tempname(&tmp, n1.type);
cgen(n->left, &tmp);
cgen(n->right, &n2);
cgen(&tmp, &n1);
return;
case OREAL:
@ -428,19 +430,21 @@ complexadd(int op, Node *nl, Node *nr, Node *res)
}
// build and execute tree
// real(res) = real(nl)*real(nr) - imag(nl)*imag(nr)
// tmp = real(nl)*real(nr) - imag(nl)*imag(nr)
// imag(res) = real(nl)*imag(nr) + imag(nl)*real(nr)
// real(res) = tmp
void
complexmul(Node *nl, Node *nr, Node *res)
{
Node n1, n2, n3, n4, n5, n6;
Node rm1, rm2, ra;
Node rm1, rm2, ra, tmp;
subnode(&n1, &n2, nl);
subnode(&n3, &n4, nr);
subnode(&n5, &n6, res);
tempname(&tmp, n5.type);
// real part
// real part -> tmp
memset(&rm1, 0, sizeof(ra));
rm1.op = OMUL;
rm1.left = &n1;
@ -458,7 +462,7 @@ complexmul(Node *nl, Node *nr, Node *res)
ra.left = &rm1;
ra.right = &rm2;
ra.type = rm1.type;
cgen(&ra, &n5);
cgen(&ra, &tmp);
// imag part
memset(&rm1, 0, sizeof(ra));
@ -479,4 +483,7 @@ complexmul(Node *nl, Node *nr, Node *res)
ra.right = &rm2;
ra.type = rm1.type;
cgen(&ra, &n6);
// tmp ->real part
cgen(&tmp, &n5);
}