[PATCH] D48067: [InstCombine] Replacing X86-specific rounding intrinsics with generic floor-ceil

[Mikhail Dvoretckii via Phabricator via llvm-commits]

mike.dvoretsky created this revision.
mike.dvoretsky added reviewers: craig.topper, spatel, RKSimon.
Herald added subscribers: llvm-commits, hiraditya.

Currently, X86 floor and ceil intrinsics for vectors are implemented as target-specific intrinsics that use the generic rounding instruction of the corresponding vector processing feature (ROUND* or VRNDSCALE*). This patch replaces those specific cases with calls to target-independent @llvm.floor.* and @llvm.ceil.* intrinsics. This doesn't affect the resulting machine code, as those intrinsics are lowered to the same instructions, but exposes these specific rounding cases to generic optimizations.

This patch relies on https://reviews.llvm.org/D45203 to fold the resulting IR patterns and serves as an alternative to https://reviews.llvm.org/D45202.


Repository:
  rL LLVM

https://reviews.llvm.org/D48067

Files:
  llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
  llvm/test/Transforms/InstCombine/X86/x86-avx.ll
  llvm/test/Transforms/InstCombine/X86/x86-avx512.ll
  llvm/test/Transforms/InstCombine/X86/x86-sse41.ll

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