[llvm] r215619 - Added InstCombine Transform for ((B | C) & A) | B -> B | (A & C)
David Majnemer
david.majnemer at gmail.com
Wed Aug 13 23:41:38 PDT 2014
Author: majnemer
Date: Thu Aug 14 01:41:38 2014
New Revision: 215619
URL: http://llvm.org/viewvc/llvm-project?rev=215619&view=rev
Log:
Added InstCombine Transform for ((B | C) & A) | B -> B | (A & C)
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
Modified:
llvm/trunk/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
llvm/trunk/test/Transforms/InstCombine/or.ll
Modified: llvm/trunk/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp?rev=215619&r1=215618&r2=215619&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp (original)
+++ llvm/trunk/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp Thu Aug 14 01:41:38 2014
@@ -2124,6 +2124,10 @@ Instruction *InstCombiner::visitOr(Binar
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))
Modified: llvm/trunk/test/Transforms/InstCombine/or.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstCombine/or.ll?rev=215619&r1=215618&r2=215619&view=diff
==============================================================================
--- llvm/trunk/test/Transforms/InstCombine/or.ll (original)
+++ llvm/trunk/test/Transforms/InstCombine/or.ll Thu Aug 14 01:41:38 2014
@@ -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
+}
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