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gc: elide dead code

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R=ken2
CC=golang-dev
https://golang.org/cl/2365044
This commit is contained in:
Russ Cox 2010-10-07 04:42:26 -04:00
parent 42c26b734c
commit 410927d1ad
1 changed files with 11 additions and 0 deletions
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11
src/cmd/gc/gen.c
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@ -257,6 +257,17 @@ gen(Node *n)
break;
case OIF:
if(n->ntest == N || n->ntest->op == OLITERAL) {
// drop dead code in if true or if false.
// the linker will do it for us in general,
// but this avoids writnig to the object file
// in a very common case.
if(n->ntest == N || n->ntest->val.u.bval)
genlist(n->nbody);
else
genlist(n->nelse);
break;
}
p1 = gjmp(P); // goto test
p2 = gjmp(P); // p2: goto else
patch(p1, pc); // test: