[PATCH] D50964: [Sparc] Use ANDN instead of AND if constant can be encoded more efficiently

[James Y Knight via Phabricator via llvm-commits]

jyknight accepted this revision.
jyknight added a comment.
This revision is now accepted and ready to land.

Seems unclear to me that the "more than one use" bit is the right assumption. But sure, let's go with that for now.



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Comment at: lib/Target/Sparc/SparcInstrInfo.td:103
+def SETHIimm_not : PatLeaf<(i32 imm), [{
+  return N->hasOneUse() && isShiftedUInt<22, 10>(~(unsigned)N->getZExtValue());
+}], HI22_not>;
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Please add the rationale for "N->hasOneUse()" in a comment here, not just in commit message.


Repository:
  rL LLVM

https://reviews.llvm.org/D50964