mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-25 16:29:20 +00:00
This patch implements transform for pattern "(A | B) & ((~A) ^ B) -> (A & B)".
Differential Revision: http://reviews.llvm.org/D4628 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214478 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
parent
d05b6c6f2c
commit
78061f4db4
@ -1295,6 +1295,16 @@ Instruction *InstCombiner::visitAnd(BinaryOperator &I) {
|
||||
if (match(Op1, m_Xor(m_Specific(B), m_Specific(A))))
|
||||
if (Op0->hasOneUse() || cast<BinaryOperator>(Op0)->hasOneUse())
|
||||
return BinaryOperator::CreateAnd(Op1, Builder->CreateNot(C));
|
||||
|
||||
// (A | B) & ((~A) ^ B) -> (A & B)
|
||||
if (match(Op0, m_Or(m_Value(A), m_Value(B))) &&
|
||||
match(Op1, m_Xor(m_Not(m_Specific(A)), m_Specific(B))))
|
||||
return BinaryOperator::CreateAnd(A, B);
|
||||
|
||||
// ((~A) ^ B) & (A | B) -> (A & B)
|
||||
if (match(Op0, m_Xor(m_Not(m_Value(A)), m_Value(B))) &&
|
||||
match(Op1, m_Or(m_Specific(A), m_Specific(B))))
|
||||
return BinaryOperator::CreateAnd(A, B);
|
||||
}
|
||||
|
||||
if (ICmpInst *RHS = dyn_cast<ICmpInst>(Op1))
|
||||
|
@ -112,3 +112,27 @@ define i32 @test11(i32 %A, i32 %B) {
|
||||
; CHECK-LABEL: @test11(
|
||||
; CHECK-NEXT: ret i32 -1
|
||||
}
|
||||
|
||||
; (x | y) & ((~x) ^ y) -> (x & y)
|
||||
define i32 @test12(i32 %x, i32 %y) {
|
||||
%or = or i32 %x, %y
|
||||
%neg = xor i32 %x, -1
|
||||
%xor = xor i32 %neg, %y
|
||||
%and = and i32 %or, %xor
|
||||
ret i32 %and
|
||||
; CHECK-LABEL: @test12(
|
||||
; CHECK-NEXT: %and = and i32 %x, %y
|
||||
; CHECK-NEXT: ret i32 %and
|
||||
}
|
||||
|
||||
; ((~x) ^ y) & (x | y) -> (x & y)
|
||||
define i32 @test13(i32 %x, i32 %y) {
|
||||
%neg = xor i32 %x, -1
|
||||
%xor = xor i32 %neg, %y
|
||||
%or = or i32 %x, %y
|
||||
%and = and i32 %xor, %or
|
||||
ret i32 %and
|
||||
; CHECK-LABEL: @test13(
|
||||
; CHECK-NEXT: %and = and i32 %x, %y
|
||||
; CHECK-NEXT: ret i32 %and
|
||||
}
|
||||
|
Loading…
Reference in New Issue
Block a user