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Added InstCombine Transform for ((B | C) & A) | B -> B | (A & C)

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Transform ((B | C) & A) | B --> B | (A & C)

Z3 Link: http://rise4fun.com/Z3/hP6p

Patch by Sonam Kumari!

Differential Revision: http://reviews.llvm.org/D4865

llvm-svn: 215619
This commit is contained in:
David Majnemer 2014-08-14 06:41:38 +00:00
parent 9b9af49013
commit a878644a06
2 changed files with 15 additions and 0 deletions
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4
lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
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@ -2124,6 +2124,10 @@ Instruction *InstCombiner::visitOr(BinaryOperator &I) {
if (Op0->hasOneUse() || cast<BinaryOperator>(Op0)->hasOneUse())
return BinaryOperator::CreateOr(Op1, C);
// ((B | C) & A) | B -> B | (A & C)
if (match(Op0, m_And(m_Or(m_Specific(Op1), m_Value(C)), m_Value(A))))
return BinaryOperator::CreateOr(Op1, Builder->CreateAnd(A, C));
// (X >> Z) | (Y >> Z) -> (X|Y) >> Z for all shifts.
if (BinaryOperator *SI1 = dyn_cast<BinaryOperator>(Op1)) {
if (BinaryOperator *SI0 = dyn_cast<BinaryOperator>(Op0))

11
test/Transforms/InstCombine/or.ll
View File

@ -469,3 +469,14 @@ define i32 @test44(i32 %a, i32 %b) {
%or = or i32 %xor, %and
ret i32 %or
}
define i32 @test45(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: test45(
; CHECK-NEXT: %1 = and i32 %x, %z
; CHECK-NEXT: %or1 = or i32 %1, %y
; CHECK-NEXT: ret i32 %or1
%or = or i32 %y, %z
%and = and i32 %x, %or
%or1 = or i32 %and, %y
ret i32 %or1
}