http://llvm.org/bugs/show_bug.cgi?id=15340
Bug ID: 15340
Summary: Missed select threading case
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Loop Optimizer
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Found this while looking at disassembly of a hot method in clang:
int *f(int *);
void foo(int *x, int *y) {
while (x != 0) {
x = f(x);
x = x == y ? x : 0;
}
}
void bar(int *x, int *y) {
while (x != 0) {
x = f(x);
if (x == y)
break;
}
}
icc and gcc turn these two into virtually identical code, LLVM emits a cmov
contraption for foo().
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