[PATCH] Added InstCombine transform for pattern "( A & (~B)) | (A ^ B) -> (A ^ B)"
suyog
suyog.sarda at samsung.com
Thu Jul 24 03:49:06 PDT 2014
Hi dexonsmith, nicholas, silvas, rafael,
This patch implements transform for pattern "( A & (~B)) | (A ^ B) -> (A ^ B)"
Please help in reviewing the same.
Z3 link : http://www.rise4fun.com/Z3/hx7d
Thanks,
Suyog
http://reviews.llvm.org/D4652
Files:
lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
test/Transforms/InstCombine/or.ll
Index: lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
===================================================================
--- lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
+++ lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
@@ -1998,6 +1998,16 @@
match(Op1, m_Not(m_Specific(A))))
return BinaryOperator::CreateOr(Builder->CreateNot(A), B);
+ // ( A & (~B)) | (A ^ B) -> (A ^ B)
+ if (match(Op0, m_And(m_Value(A), m_Not(m_Value(B)))) &&
+ match(Op1, m_Xor(m_Specific(A), m_Specific(B))))
+ return BinaryOperator::CreateXor(A, B);
+
+ // (A ^ B) | ( A & (~B)) -> (A ^ B)
+ if (match(Op0, m_Xor(m_Value(A), m_Value(B))) &&
+ match(Op1, m_And(m_Specific(A), m_Not(m_Specific(B)))))
+ return BinaryOperator::CreateXor(A, B);
+
// (A & C)|(B & D)
Value *C = nullptr, *D = nullptr;
if (match(Op0, m_And(m_Value(A), m_Value(C))) &&
Index: test/Transforms/InstCombine/or.ll
===================================================================
--- test/Transforms/InstCombine/or.ll
+++ test/Transforms/InstCombine/or.ll
@@ -427,3 +427,23 @@
%or = or i32 %and, %xor
ret i32 %or
}
+
+define i32 @test41(i32 %a, i32 %b) {
+; CHECK-LABEL: test41(
+; CHECK-NEXT: %or = xor i32 %a, %b
+ %neg = xor i32 %b, -1
+ %and = and i32 %a, %neg
+ %xor = xor i32 %a, %b
+ %or = or i32 %and, %xor
+ ret i32 %or
+}
+
+define i32 @test42(i32 %a, i32 %b) {
+; CHECK-LABEL: test42(
+; CHECK-NEXT: %or = xor i32 %a, %b
+ %xor = xor i32 %a, %b
+ %neg = xor i32 %b, -1
+ %and = and i32 %a, %neg
+ %or = or i32 %xor, %and
+ ret i32 %or
+}
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