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

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Patch Credit to Ankit Jain !!

Differential Revision: http://reviews.llvm.org/D4588



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213662 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Suyog Sarda 2014-07-22 15:37:39 +00:00
parent 43b471c45e
commit 578c74e35d
2 changed files with 29 additions and 0 deletions
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6
lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
View File

@ -2446,6 +2446,12 @@ Instruction *InstCombiner::visitXor(BinaryOperator &I) {
}
}
// (A | B)^(~A) -> (A | ~B)
Value *A = nullptr, *B = nullptr;
if (match(Op0, m_Or(m_Value(A), m_Value(B))) &&
match(Op1, m_Not(m_Specific(A))))
return BinaryOperator::CreateOr(A, Builder->CreateNot(B));
// (icmp1 A, B) ^ (icmp2 A, B) --> (icmp3 A, B)
if (ICmpInst *RHS = dyn_cast<ICmpInst>(I.getOperand(1)))
if (ICmpInst *LHS = dyn_cast<ICmpInst>(I.getOperand(0)))

23
test/Transforms/InstCombine/xor2.ll
View File

@ -82,3 +82,26 @@ define i32 @test6(i32 %x) {
; CHECK: lshr i32 %x, 16
; CHECK: ret
}
; (A | B) ^ (~A) -> (A | ~B)
define i32 @test7(i32 %a, i32 %b) #0 {
%or = or i32 %a, %b
%neg = xor i32 %a, -1
%xor = xor i32 %or, %neg
ret i32 %xor
; CHECK-LABEL: @test7(
; CHECK-NEXT: %1 = xor i32 %b, -1
; CHECK-NEXT: %xor = or i32 %a, %1
}
; (~A) ^ (A | B) -> (A | ~B)
define i32 @test8(i32 %a, i32 %b) #0 {
%neg = xor i32 %a, -1
%or = or i32 %a, %b
%xor = xor i32 %neg, %or
ret i32 %xor
; CHECK-LABEL: @test8(
; CHECK-NEXT: %1 = xor i32 %b, -1
; CHECK-NEXT: %xor = or i32 %a, %1
}