https://bugs.llvm.org/show_bug.cgi?id=40281
Bug ID: 40281
Summary: Remove some/all of the X86ISD double shift opcodes
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: craig.top...@gmail.com, llvm-bugs@lists.llvm.org,
llvm-...@redking.me.uk, spatel+l...@rotateright.com
For X86ISD::VSHLDV/VSHRDV we should be able to use the ISD::FSHL/FSHR opcodes
directly, including the isel patterns.
The immediate X86ISD::VSHLD/VSHRD opcodes will probably have to stay - although
I did wonder if it'd be useful to merge these with the scalar X86ISD::SHLD/SHRD
opcodes?
NOTE: I can't see a way to get rid of the X86ISD::SHLD/SHRD opcodes while we
still need to handle the i16 (no modulo) special case, although I suppose it
doesn't stop us using the ISD::FSHL/FSHR opcodes directly for i32/i64 if its
useful?
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