[PATCH] Added InstCombine Transform for pattern "((~A & B) | A) -> (A | B)"

[Duncan P. N. Exon Smith]

LGTM.

> On 2014-Jul-22, at 10:44, suyog <suyog.sarda at samsung.com> wrote:
> 
> Hi Duncan,
> 
> Added Code for Pattern "((A & B) | ~A) -> (~A | B)" as well as per your review.
> 
> Please help in reviewing the updated patch.
> 
> Thanks,
> Suyog Sarda
> 
> http://reviews.llvm.org/D4591
> 
> Files:
>  lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
>  test/Transforms/InstCombine/or.ll
> 
> Index: test/Transforms/InstCombine/or.ll
> ===================================================================
> --- test/Transforms/InstCombine/or.ll
> +++ test/Transforms/InstCombine/or.ll
> @@ -408,3 +408,22 @@
>   %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
> +}
> Index: lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
> ===================================================================
> --- lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
> +++ lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
> @@ -1988,6 +1988,16 @@
>     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))) &&
> <D4591.11765.patch>