[PATCH] D38275: [X86] Improve handling of UDIVREM8_ZEXT_HREG/SDIVREM8_SEXT_HREG to support 64-bit extensions.

[Craig Topper via Phabricator via llvm-commits]

craig.topper updated this revision to Diff 120304.
craig.topper retitled this revision from "[X86] Improve handling of UDIVREM8_ZEXT_HREG/UDIVREM8_SEXT_HREG to support 64-bit extensions." to "[X86] Improve handling of UDIVREM8_ZEXT_HREG/SDIVREM8_SEXT_HREG to support 64-bit extensions.".
craig.topper added a comment.

Add known and sign bits support for UDIVREM8_ZEXT_HREG/SDIVREM8_SEXT_HREG. The UDIVREM8_ZEXT_HREG is needed to prevent a regression on one of the test cases where an extra setb was being generated.


https://reviews.llvm.org/D38275

Files:
  lib/Target/X86/X86ISelDAGToDAG.cpp
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/divrem8_ext.ll

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