https://bugs.llvm.org/show_bug.cgi?id=36881
Bug ID: 36881
Summary: [X86] TZCNT/LZCNT/BSR/BSF have weird SchedRW
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
BSR and BSF are using WriteShift. TZCNT/LZCNT are using WriteIMul.
I assume that generally WriteShift would be faster than WriteIMul. But
TZCNT/LZCNT are know to be better than BSR/BSF on some CPUs.
--
You are receiving this mail because:
You are on the CC list for the bug._______________________________________________
llvm-bugs mailing list
[email protected]
http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
