poor codegen for code size #1668
Description
| Bugzilla Link | 1296 |
| Resolution | FIXED |
| Resolved on | Feb 22, 2010 12:48 |
| Version | 1.0 |
| OS | All |
| CC | @nlewycky |
Extended Description
This contrived testcase:
int foo(int A, int B, int C) {
int i;
int result = 0;
if (A == 1) {
for (i = 0; i < 1000; ++i) {
if (i & B) {result = 1; break; }
}
} else if (A == 0) {
for (i = 0; i < 1000; ++i) {
if (i & C) {result = 1; break; }
}
} else if (A == 2) {
for (i = 0; i < 1000; ++i) {
if (i & C) {result = 1; break; }
}
}
out:
return result;
}
Produces silly code like this:
LBB1_19: #bb13.out.loopexit1_crit_edge
movl $1, %eax
jmp LBB1_15 #out
LBB1_20: #bb.out.loopexit_crit_edge
movl $1, %eax
jmp LBB1_15 #out
LBB1_21: #bb27.out.loopexit3_crit_edge
movl $1, %eax
jmp LBB1_15 #out