[PATCH] D22477: [InstCombine] fold add(zext(xor X, C), C) --> sext X when C is INT_MIN in the source type

[Sanjay Patel via llvm-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rL276035: [InstCombine] fold add(zext(xor X, C), C) --> sext X when C is INT_MIN in the… (authored by spatel).

Changed prior to commit:
  https://reviews.llvm.org/D22477?vs=64381&id=64575#toc

Repository:
  rL LLVM

https://reviews.llvm.org/D22477

Files:
  llvm/trunk/lib/Transforms/InstCombine/InstCombineAddSub.cpp
  llvm/trunk/test/Transforms/InstCombine/apint-add.ll

Index: llvm/trunk/test/Transforms/InstCombine/apint-add.ll
===================================================================
--- llvm/trunk/test/Transforms/InstCombine/apint-add.ll
+++ llvm/trunk/test/Transforms/InstCombine/apint-add.ll
@@ -56,9 +56,7 @@
 
 define i7 @sext(i4 %x) {
 ; CHECK-LABEL: @sext(
-; CHECK-NEXT:    [[XOR:%.*]] = xor i4 %x, -8
-; CHECK-NEXT:    [[ZEXT:%.*]] = zext i4 [[XOR]] to i7
-; CHECK-NEXT:    [[ADD:%.*]] = add nsw i7 [[ZEXT]], -8
+; CHECK-NEXT:    [[ADD:%.*]] = sext i4 %x to i7
 ; CHECK-NEXT:    ret i7 [[ADD]]
 ;
   %xor = xor i4 %x, -8
@@ -69,17 +67,36 @@
 
 define <2 x i10> @sext_vec(<2 x i3> %x) {
 ; CHECK-LABEL: @sext_vec(
-; CHECK-NEXT:    [[XOR:%.*]] = xor <2 x i3> %x, <i3 -4, i3 -4>
-; CHECK-NEXT:    [[ZEXT:%.*]] = zext <2 x i3> [[XOR]] to <2 x i10>
-; CHECK-NEXT:    [[ADD:%.*]] = add nsw <2 x i10> [[ZEXT]], <i10 -4, i10 -4>
+; CHECK-NEXT:    [[ADD:%.*]] = sext <2 x i3> %x to <2 x i10>
 ; CHECK-NEXT:    ret <2 x i10> [[ADD]]
 ;
   %xor = xor <2 x i3> %x, <i3 -4, i3 -4>
   %zext = zext <2 x i3> %xor to <2 x i10>
   %add = add nsw <2 x i10> %zext, <i10 -4, i10 -4>
   ret <2 x i10> %add
 }
 
+; Multiple uses of the operands don't prevent the fold.
+
+define i4 @sext_multiuse(i4 %x) {
+; CHECK-LABEL: @sext_multiuse(
+; CHECK-NEXT:    [[XOR:%.*]] = xor i4 %x, -8
+; CHECK-NEXT:    [[ZEXT:%.*]] = zext i4 [[XOR]] to i7
+; CHECK-NEXT:    [[ADD:%.*]] = sext i4 %x to i7
+; CHECK-NEXT:    [[MUL:%.*]] = sdiv i7 [[ZEXT]], [[ADD]]
+; CHECK-NEXT:    [[TRUNC:%.*]] = trunc i7 [[MUL]] to i4
+; CHECK-NEXT:    [[DIV:%.*]] = sdiv i4 [[TRUNC]], [[XOR]]
+; CHECK-NEXT:    ret i4 [[DIV]]
+;
+  %xor = xor i4 %x, -8
+  %zext = zext i4 %xor to i7
+  %add = add nsw i7 %zext, -8
+  %mul = sdiv i7 %zext, %add
+  %trunc = trunc i7 %mul to i4
+  %div = sdiv i4 %trunc, %xor
+  ret i4 %div
+}
+
 ; Tests for Integer BitWidth > 64 && BitWidth <= 1024.
 
 ;; Flip sign bit then add INT_MIN -> nop.
Index: llvm/trunk/lib/Transforms/InstCombine/InstCombineAddSub.cpp
===================================================================
--- llvm/trunk/lib/Transforms/InstCombine/InstCombineAddSub.cpp
+++ llvm/trunk/lib/Transforms/InstCombine/InstCombineAddSub.cpp
@@ -1047,6 +1047,16 @@
     // X + (signbit) --> X ^ signbit
     if (Val->isSignBit())
       return BinaryOperator::CreateXor(LHS, RHS);
+
+    // Is this add the last step in a convoluted sext?
+    Value *X;
+    const APInt *C;
+    if (match(LHS, m_ZExt(m_Xor(m_Value(X), m_APInt(C)))) &&
+        C->isMinSignedValue() &&
+        C->sext(LHS->getType()->getScalarSizeInBits()) == *Val) {
+      // add(zext(xor i16 X, -32768), -32768) --> sext X
+      return CastInst::Create(Instruction::SExt, X, LHS->getType());
+    }
   }
 
   // FIXME: Use the match above instead of dyn_cast to allow these transforms


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