https://bugs.llvm.org/show_bug.cgi?id=34875
Bug ID: 34875
Summary: [X86] X86movss/X86movsd should select BLENDPS/BLENDPD
instruction during isel unless optimizing for size
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
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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