[PATCH] D27323: [X86] Fix non-intrinsic roundss/roundsd to not read the destination register

[Michael Kuperstein via Phabricator via llvm-commits]

mkuper created this revision.
mkuper added reviewers: craig.topper, zvi.
mkuper added a subscriber: llvm-commits.

This changes the scalar non-intrinsic non-avx roundss/sd instruction definitions not to read their destination register - allowing partial dependency breaking.

This fixes PR31143.


https://reviews.llvm.org/D27323

Files:
  lib/Target/X86/X86InstrSSE.td
  test/CodeGen/X86/pr31143.ll
  test/CodeGen/X86/stack-folding-fp-sse42.ll

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