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[SLSR] handles non-canonicalized Mul candidates

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such as (2 + B) * S.

Tested by @non_canonicalized in slsr-mul.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237216 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jingyue Wu
2015-05-13 00:03:17 +00:00
parent ead2d1fbe0
commit 3062272092
2 changed files with 23 additions and 2 deletions
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4
lib/Transforms/Scalar/StraightLineStrengthReduce.cpp
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@@ -408,8 +408,8 @@ void StraightLineStrengthReduce::allocateCandidatesAndFindBasisForMul(
Value *LHS, Value *RHS, Instruction *I) {
Value *B = nullptr;
ConstantInt *Idx = nullptr;
// Only handle the canonical operand ordering.
if (match(LHS, m_Add(m_Value(B), m_ConstantInt(Idx)))) {
if (match(LHS, m_Add(m_Value(B), m_ConstantInt(Idx))) ||
match(LHS, m_Add(m_ConstantInt(Idx), m_Value(B)))) {
// If LHS is in the form of "Base + Index", then I is in the form of
// "(Base + Index) * RHS".
allocateCandidatesAndFindBasis(Candidate::Mul, SE->getSCEV(B), Idx, RHS, I);

21
test/Transforms/StraightLineStrengthReduce/slsr-mul.ll
View File

@@ -23,6 +23,27 @@ define void @slsr1(i32 %b, i32 %s) {
ret void
}
define void @non_canonicalized(i32 %b, i32 %s) {
; CHECK-LABEL: @non_canonicalized(
; foo(b * s);
%mul0 = mul i32 %b, %s
; CHECK: mul i32
; CHECK-NOT: mul i32
call void @foo(i32 %mul0)
; foo((1 + b) * s);
%b1 = add i32 1, %b
%mul1 = mul i32 %b1, %s
call void @foo(i32 %mul1)
; foo((2 + b) * s);
%b2 = add i32 2, %b
%mul2 = mul i32 %b2, %s
call void @foo(i32 %mul2)
ret void
}
; foo(a * b)
; foo((a + 1) * b)
; foo(a * (b + 1))