http://llvm.org/bugs/show_bug.cgi?id=3170
Summary: loop unswitch never unswitches any loops
Product: new-bugs
Version: unspecified
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: new bugs
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
CC: [EMAIL PROTECTED], [email protected]
Take even the most trivial loop to unswitch:
int a(int x, int y) {
for (unsigned i = 0; i < y; i++) {
if (x) {
b();
}
}return 0;
}
Loop unswitch somehow can't manage to unswitch it.
The cause here is r58631; it changed FindLIVLoopCondition so that it always
returns null, which means the unswitcher can never find any conditions to
unswitch on. I somehow doubt that was the intention, but I can't figure out
what it was trying to do.
--
Configure bugmail: http://llvm.org/bugs/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are on the CC list for the bug.
_______________________________________________
LLVMbugs mailing list
[email protected]
http://lists.cs.uiuc.edu/mailman/listinfo/llvmbugs
