https://bugs.llvm.org/show_bug.cgi?id=40203
Bug ID: 40203
Summary: [X86][SSE] Remove shift-by-immediate llvm x86
intrinsics
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
The SSE SLLI/SRLI/SRAI vector uniform shift by immediate intrinsics still exist
due to a gcc compatibility issue requiring us to support non-immediate values
in the '_mm_slli_epi32' style C/C++ intrinsics.
What would be better is if CGBuiltin could promote the non-immediate cases to
use the uniform variable equivalent intrinsics (__builtin_ia32_pslldi128 ->
__builtin_ia32_pslld128 etc.) and the 'normal' cases replaced with generic
shifts (or zero for out of range logical shifts).
This would allow us to remove all the existing slli intrinsics and their
handling.
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