Speculatively revert r108429 to fix the clang self-host.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108436 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 28 insertions, 19 deletions

diff --git a/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp b/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
index e19ddd1..5876f40 100644
--- a/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
+++ b/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
@@ -1177,25 +1177,6 @@ Value *InstCombiner::FoldOrOfICmps(ICmpInst *LHS, ICmpInst *RHS) {
     return Builder->CreateICmp(LHSCC, NewOr, LHSCst);
   }
   
-  // (icmp eq (A & C1), 0) | (icmp eq (A & C2), 0) -->
-  // (icmp ne (A & (C1|C2)), (C1|C2))
-  if (LHSCC == ICmpInst::ICMP_EQ && LHSCst->isZero()) {
-    Instruction *I1 = dyn_cast<Instruction>(Val);
-    Instruction *I2 = dyn_cast<Instruction>(Val2);
-    if (I1 && I1->getOpcode() == Instruction::And &&
-        I2 && I2->getOpcode() == Instruction::And &&
-        I1->getOperand(0) == I1->getOperand(0)) {
-      ConstantInt *CI1 = dyn_cast<ConstantInt>(I1->getOperand(1));
-      ConstantInt *CI2 = dyn_cast<ConstantInt>(I2->getOperand(1));
-      if (CI1 && !CI1->isZero() && CI2 && !CI2->isZero() &&
-          CI1->getValue().operator&(CI2->getValue()) == 0) {
-        Constant *ConstOr = ConstantExpr::getOr(CI1, CI2);
-        Value *NewAnd = Builder->CreateAnd(I1->getOperand(0), ConstOr);
-        return Builder->CreateICmp(ICmpInst::ICMP_NE, NewAnd, ConstOr);
-      }
-    }
-  }
-  
   // From here on, we only handle:
   //    (icmp1 A, C1) | (icmp2 A, C2) --> something simpler.
   if (Val != Val2) return 0;
diff --git a/lib/Transforms/InstCombine/InstCombineSelect.cpp b/lib/Transforms/InstCombine/InstCombineSelect.cpp
index c44fe9d..f9ffdb1 100644
--- a/lib/Transforms/InstCombine/InstCombineSelect.cpp
+++ b/lib/Transforms/InstCombine/InstCombineSelect.cpp
@@ -699,6 +699,34 @@ Instruction *InstCombiner::visitSelectInst(SelectInst &SI) {
     SI.setOperand(2, TrueVal);
     return &SI;
   }
+  
+  // select (A == 0 | B == 0), T, F--> select (A != 0 & B != 0), F, T
+  // Note: This is a canonicalization rather than an optimization, and is used
+  // to expose opportunities to other instcombine transforms.
+  Instruction* CondInst = dyn_cast<Instruction>(CondVal);
+  if (CondInst && CondInst->hasOneUse() && 
+      CondInst->getOpcode() == Instruction::Or) {
+    ICmpInst *LHSCmp = dyn_cast<ICmpInst>(CondInst->getOperand(0));
+    ICmpInst *RHSCmp = dyn_cast<ICmpInst>(CondInst->getOperand(1));
+    if (LHSCmp && LHSCmp->hasOneUse() &&
+                  LHSCmp->getPredicate() == ICmpInst::ICMP_EQ &&
+        RHSCmp && RHSCmp->hasOneUse() &&
+                  RHSCmp->getPredicate() == ICmpInst::ICMP_EQ) {
+      ConstantInt* C1 = dyn_cast<ConstantInt>(LHSCmp->getOperand(1));
+      ConstantInt* C2 = dyn_cast<ConstantInt>(RHSCmp->getOperand(1));
+      if (C1 && C1->isZero() && C2 && C2->isZero()) {
+        LHSCmp->setPredicate(ICmpInst::ICMP_NE);
+        RHSCmp->setPredicate(ICmpInst::ICMP_NE);
+        Value *And =
+          InsertNewInstBefore(BinaryOperator::CreateAnd(LHSCmp, RHSCmp,
+                                             "and."+CondVal->getName()), SI);
+        SI.setOperand(0, And);
+        SI.setOperand(1, FalseVal);
+        SI.setOperand(2, TrueVal);
+        return &SI;
+      }
+    }
+  }
 
   return 0;
 }