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InstCombine: Disable umul.with.overflow recognition for vectors.

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It doesn't make a lot on most targets and the code isn't ready for it. PR20113.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211583 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2014-06-24 10:47:52 +00:00
parent 9c88403625
commit 0e6156a1a2
2 changed files with 16 additions and 1 deletions
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6
lib/Transforms/InstCombine/InstCombineCompares.cpp
View File

@ -2042,9 +2042,13 @@ static Instruction *ProcessUAddIdiom(Instruction &I, Value *OrigAddV,
/// replacement required.
static Instruction *ProcessUMulZExtIdiom(ICmpInst &I, Value *MulVal,
Value *OtherVal, InstCombiner &IC) {
// Don't bother doing this transformation for pointers, don't do it for
// vectors.
if (!isa<IntegerType>(MulVal->getType()))
return nullptr;
assert(I.getOperand(0) == MulVal || I.getOperand(1) == MulVal);
assert(I.getOperand(0) == OtherVal || I.getOperand(1) == OtherVal);
assert(isa<IntegerType>(MulVal->getType()));
Instruction *MulInstr = cast<Instruction>(MulVal);
assert(MulInstr->getOpcode() == Instruction::Mul);

11
test/Transforms/InstCombine/overflow-mul.ll
View File

@ -162,3 +162,14 @@ entry:
ret i32 %retval
}
define <4 x i32> @pr20113(<4 x i16> %a, <4 x i16> %b) {
; CHECK-LABEL: @pr20113
; CHECK-NOT: mul.with.overflow
; CHECK: ret
%vmovl.i.i726 = zext <4 x i16> %a to <4 x i32>
%vmovl.i.i712 = zext <4 x i16> %b to <4 x i32>
%mul.i703 = mul <4 x i32> %vmovl.i.i712, %vmovl.i.i726
%tmp = icmp sge <4 x i32> %mul.i703, zeroinitializer
%vcgez.i = sext <4 x i1> %tmp to <4 x i32>
ret <4 x i32> %vcgez.i
}