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[Reassociate] Canonicalize the operands of all binary operators.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222008 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chad Rosier 2014-11-14 17:09:19 +00:00
parent e968287996
commit 5c76b3d03e
3 changed files with 31 additions and 12 deletions
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22
lib/Transforms/Scalar/Reassociate.cpp
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@ -2078,19 +2078,19 @@ void Reassociate::OptimizeInst(Instruction *I) {
if (Instruction *Res = canonicalizeNegConstExpr(I))
I = Res;
// Commute floating point binary operators, to canonicalize the order of their
// operands. This can potentially expose more CSE opportunities, and makes
// writing other transformations simpler.
if (I->getType()->isFloatingPointTy() || I->getType()->isVectorTy()) {
// Commute binary operators, to canonicalize the order of their operands.
// This can potentially expose more CSE opportunities, and makes writing other
// transformations simpler.
if (I->isCommutative())
canonicalizeOperands(I);
if (I->isCommutative())
canonicalizeOperands(I);
// Don't optimize vector instructions.
if (I->getType()->isVectorTy())
return;
// Don't try to optimize vector instructions or anything that doesn't have
// unsafe algebra.
if (I->getType()->isVectorTy() || !I->hasUnsafeAlgebra())
return;
}
// Don't optimize floating point instructions that don't have unsafe algebra.
if (I->getType()->isFloatingPointTy() && !I->hasUnsafeAlgebra())
return;
// Do not reassociate boolean (i1) expressions. We want to preserve the
// original order of evaluation for short-circuited comparisons that

19
test/Transforms/Reassociate/commute.ll Normal file
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@ -0,0 +1,19 @@
; RUN: opt -reassociate -S < %s | FileCheck %s
declare void @use(i32)
define void @test1(i32 %x, i32 %y) {
; CHECK-LABEL: test1
; CHECK: mul i32 %y, %x
; CHECK: mul i32 %y, %x
; CHECK: sub i32 %1, %2
; CHECK: call void @use(i32 %{{.*}})
; CHECK: call void @use(i32 %{{.*}})
%1 = mul i32 %x, %y
%2 = mul i32 %y, %x
%3 = sub i32 %1, %2
call void @use(i32 %1)
call void @use(i32 %3)
ret void
}

2
test/Transforms/Reassociate/multistep.ll
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@ -9,7 +9,7 @@ define i64 @multistep1(i64 %a, i64 %b, i64 %c) {
%t3 = mul i64 %a, %t2 ; a*(a*c)
%t4 = add i64 %t1, %t3
; CHECK-NEXT: add i64 %c, %b
; CHECK-NEXT: mul i64 %tmp{{.*}}, %a
; CHECK-NEXT: mul i64 %a, %tmp{{.*}}
; CHECK-NEXT: mul i64 %tmp{{.*}}, %a
; CHECK-NEXT: ret
ret i64 %t4