https://bugs.llvm.org/show_bug.cgi?id=40758
Bug ID: 40758
Summary: [X86][SSE] Adjust shouldFoldShiftPairToMask for btver2
targets for uniform constant shifts
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: llvm-...@redking.me.uk
CC: andrea.dibia...@gmail.com, craig.top...@gmail.com,
llvm-bugs@lists.llvm.org, llvm-...@redking.me.uk,
spatel+l...@rotateright.com
As discussed on https://reviews.llvm.org/D58225, for the btver2 (Jaguar) target
(and maybe some others), it would be better to use 2 uniform constant shifts
than a shift and a mask loaded from constant pool (even if the mask is lifted
out of a hot loop I don't think it gives any benefit).
This probably means yet another Feature bit.....
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