[PATCH] Added InstCombine transform for pattern "(A & B) | ((~A) ^ B) -> (~A ^ B)"
suyog
suyog.sarda at samsung.com
Thu Jul 31 21:51:04 PDT 2014
Closed by commit rL214476 (authored by @suyog).
REPOSITORY
rL LLVM
http://reviews.llvm.org/D4655
Files:
llvm/trunk/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
llvm/trunk/test/Transforms/InstCombine/or.ll
Index: llvm/trunk/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
===================================================================
--- llvm/trunk/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
+++ llvm/trunk/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
@@ -2167,6 +2167,16 @@
return BinaryOperator::CreateOr(Not, Op0);
}
+ // (A & B) | ((~A) ^ B) -> (~A ^ B)
+ if (match(Op0, m_And(m_Value(A), m_Value(B))) &&
+ match(Op1, m_Xor(m_Not(m_Specific(A)), m_Specific(B))))
+ return BinaryOperator::CreateXor(Builder->CreateNot(A), B);
+
+ // ((~A) ^ B) | (A & B) -> (~A ^ B)
+ if (match(Op0, m_Xor(m_Not(m_Value(A)), m_Value(B))) &&
+ match(Op1, m_And(m_Specific(A), m_Specific(B))))
+ return BinaryOperator::CreateXor(Builder->CreateNot(A), B);
+
if (SwappedForXor)
std::swap(Op0, Op1);
Index: llvm/trunk/test/Transforms/InstCombine/or.ll
===================================================================
--- llvm/trunk/test/Transforms/InstCombine/or.ll
+++ llvm/trunk/test/Transforms/InstCombine/or.ll
@@ -427,3 +427,25 @@
%or = or i32 %and, %xor
ret i32 %or
}
+
+define i32 @test41(i32 %a, i32 %b) {
+; CHECK-LABEL: test41(
+; CHECK-NEXT: %1 = xor i32 %a, -1
+; CHECK-NEXT: %or = xor i32 %1, %b
+ %and = and i32 %a, %b
+ %nega = xor i32 %a, -1
+ %xor = xor i32 %nega, %b
+ %or = or i32 %and, %xor
+ ret i32 %or
+}
+
+define i32 @test42(i32 %a, i32 %b) {
+; CHECK-LABEL: test42(
+; CHECK-NEXT: %1 = xor i32 %a, -1
+; CHECK-NEXT: %or = xor i32 %1, %b
+ %nega = xor i32 %a, -1
+ %xor = xor i32 %nega, %b
+ %and = and i32 %a, %b
+ %or = or i32 %xor, %and
+ ret i32 %or
+}
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