[llvm-bugs] [Bug 34875] New: [X86] X86movss/X86movsd should select BLENDPS/BLENDPD instruction during isel unless optimizing for size
llvm-bugs at lists.llvm.org
Sun Oct 8 10:13:58 PDT 2017
Bug ID: 34875
Summary: [X86] X86movss/X86movsd should select BLENDPS/BLENDPD
instruction during isel unless optimizing for size
Component: Backend: X86
Assignee: unassignedbugs at nondot.org
Reporter: craig.topper at gmail.com
CC: llvm-bugs at lists.llvm.org
Currently X86movss/X86movsd selects the MOVSS/MOVSD instructions which
frequently get commuted to BLENDPS/BLENDPD and then commuted again to
BLENDPS/BLENDPD with immediate of 1. This ultimately prevents MOVSS/MOVSD from
appearing in code when BLENDPS/BLENDPD is available, but is a little goofy.
Ideally, we should just select BLENDPS/BLENDPD directly during isel.
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