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Added InstCombine Transform for patterns:

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"((~A & B) | A) -> (A | B)" and "((A & B) | ~A) -> (~A | B)"

Original Patch credit to Ankit Jain !!

Differential Revision: http://reviews.llvm.org/D4591



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213676 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Suyog Sarda 2014-07-22 18:09:41 +00:00
parent 66ce49d22a
commit 1a1b1f708d
2 changed files with 29 additions and 0 deletions
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10
lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
View File

@ -1988,6 +1988,16 @@ Instruction *InstCombiner::visitOr(BinaryOperator &I) {
return BinaryOperator::CreateXor(NOr, C1);
}
// ((~A & B) | A) -> (A | B)
if (match(Op0, m_And(m_Not(m_Value(A)), m_Value(B))) &&
match(Op1, m_Specific(A)))
return BinaryOperator::CreateOr(A, B);
// ((A & B) | ~A) -> (~A | B)
if (match(Op0, m_And(m_Value(A), m_Value(B))) &&
match(Op1, m_Not(m_Specific(A))))
return BinaryOperator::CreateOr(Builder->CreateNot(A), B);
// (A & C)|(B & D)
Value *C = nullptr, *D = nullptr;
if (match(Op0, m_And(m_Value(A), m_Value(C))) &&

19
test/Transforms/InstCombine/or.ll
View File

@ -408,3 +408,22 @@ define i32 @test38(i32* %xp, i32 %y) {
%or = or i32 %x, %sext
ret i32 %or
}
define i32 @test39(i32 %a, i32 %b) {
; CHECK-LABEL: test39(
; CHECK-NEXT: %or = or i32 %a, %b
%xor = xor i32 %a, -1
%and = and i32 %xor, %b
%or = or i32 %and, %a
ret i32 %or
}
define i32 @test40(i32 %a, i32 %b) {
; CHECK-LABEL: test40(
; CHECK-NEXT: %1 = xor i32 %a, -1
; CHECK-NEXT: %or = or i32 %1, %b
%and = and i32 %a, %b
%xor = xor i32 %a, -1
%or = or i32 %and, %xor
ret i32 %or
}