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This patch implements transform for pattern "( A & (~B)) | (A ^ B) -> (A ^ B)"

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Differential Revision: http://reviews.llvm.org/D4652



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214477 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Suyog Sarda 2014-08-01 04:50:31 +00:00
parent 87569413b0
commit d05b6c6f2c
2 changed files with 30 additions and 0 deletions
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10
lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
View File

@ -2010,6 +2010,16 @@ Instruction *InstCombiner::visitOr(BinaryOperator &I) {
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))) &&

20
test/Transforms/InstCombine/or.ll
View File

@ -449,3 +449,23 @@ define i32 @test42(i32 %a, i32 %b) {
%or = or i32 %xor, %and
ret i32 %or
}
define i32 @test43(i32 %a, i32 %b) {
; CHECK-LABEL: test43(
; 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 @test44(i32 %a, i32 %b) {
; CHECK-LABEL: test44(
; 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
}