[PATCH] D151660: [InstCombine] (icmp eq A, -1) & (icmp eq B, -1) --> (icmp eq (A&B), -1)

[Shivam Gupta via Phabricator via llvm-commits]

xgupta updated this revision to Diff 527727.
xgupta added a comment.

Remove TODO


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D151660/new/

https://reviews.llvm.org/D151660

Files:
  llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp


Index: llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
===================================================================
--- llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
+++ llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
@@ -2947,6 +2947,16 @@
                               Constant::getNullValue(NewOr->getType()));
   }
 
+  // (icmp ne A, -1) | (icmp ne B, -1) --> (icmp ne (A&B), -1)
+  // (icmp eq A, -1) & (icmp eq B, -1) --> (icmp eq (A&B), -1)
+  if (!IsLogical && PredL == (IsAnd ? ICmpInst::ICMP_EQ : ICmpInst::ICMP_NE) &&
+      PredL == PredR && match(LHS1, m_AllOnes()) && match(RHS1, m_AllOnes()) &&
+      LHS0->getType() == RHS0->getType()) {
+    Value *NewAnd = Builder.CreateAnd(LHS0, RHS0);
+    return Builder.CreateICmp(PredL, NewAnd,
+                              Constant::getAllOnesValue(LHS0->getType()));
+  }
+
   // This only handles icmp of constants: (icmp1 A, C1) | (icmp2 B, C2).
   if (!LHSC || !RHSC)
     return nullptr;


-------------- next part --------------
A non-text attachment was scrubbed...
Name: D151660.527727.patch
Type: text/x-patch
Size: 989 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20230602/7ddc4d81/attachment.bin>