[llvm-commits] [llvm] r108320 - in /llvm/trunk: lib/Transforms/InstCombine/InstCombineAndOrXor.cpp test/Transforms/InstCombine/or.ll
Chris Lattner
sabre at nondot.org
Tue Jul 13 22:59:14 PDT 2010
Author: lattner
Date: Wed Jul 14 00:59:13 2010
New Revision: 108320
URL: http://llvm.org/viewvc/llvm-project?rev=108320&view=rev
Log:
reapply benjamin's instcombine patch, I don't see anything wrong with it and can't repro any problems with a manual self-host.
Modified:
llvm/trunk/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
llvm/trunk/test/Transforms/InstCombine/or.ll
Modified: llvm/trunk/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp?rev=108320&r1=108319&r2=108320&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp (original)
+++ llvm/trunk/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp Wed Jul 14 00:59:13 2010
@@ -1597,6 +1597,14 @@
Instruction *Ret = FoldOrWithConstants(I, Op0, A, V1, D);
if (Ret) return Ret;
}
+
+ // (A & ~D) | (B & D) -> ((B ^ A) & D) ^ A
+ if (Op0->hasOneUse() && Op1->hasOneUse() &&
+ match(C, m_Not(m_Specific(D)))) {
+ Value *Xor = Builder->CreateXor(B, A, "xor");
+ Value *And = Builder->CreateAnd(Xor, D, "and");
+ return BinaryOperator::CreateXor(And, A);
+ }
}
// (X >> Z) | (Y >> Z) -> (X|Y) >> Z for all shifts.
Modified: llvm/trunk/test/Transforms/InstCombine/or.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstCombine/or.ll?rev=108320&r1=108319&r2=108320&view=diff
==============================================================================
--- llvm/trunk/test/Transforms/InstCombine/or.ll (original)
+++ llvm/trunk/test/Transforms/InstCombine/or.ll Wed Jul 14 00:59:13 2010
@@ -350,3 +350,16 @@
; CHECK: or <4 x i32> %and.i, %and.i129
}
+; PR6773
+define i32 @test33(i32 %x, i32 %y, i32 %z) nounwind readnone {
+ %and = and i32 %y, %x
+ %not = xor i32 %x, -1
+ %and2 = and i32 %z, %not
+ %or = or i32 %and2, %and
+ ret i32 %or
+; CHECK: @test33
+; CHECK-NEXT: xor i32
+; CHECK-NEXT: and i32
+; CHECK-NEXT: xor i32
+; CHECK-NEXT: ret i32
+}
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