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[ConstantFold][SVE] Fix constand fold for vector call.

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Summary:
Do not iterate on scalable vectors.

Reviewers: sdesmalen, efriedma, apazos, huntergr, willlovett

Reviewed By: sdesmalen

Subscribers: tschuett, hiraditya, rkruppe, psnobl, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D74419
This commit is contained in:
Huihui Zhang 2020-02-11 14:04:45 -08:00
parent 886e13050e
commit 10305a8da8
2 changed files with 16 additions and 0 deletions
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5
lib/Analysis/ConstantFolding.cpp
View File

@ -2400,6 +2400,11 @@ static Constant *ConstantFoldVectorCall(StringRef Name,
SmallVector<Constant *, 4> Lane(Operands.size());
Type *Ty = VTy->getElementType();
// Do not iterate on scalable vector. The number of elements is unknown at
// compile-time.
if (VTy->getVectorIsScalable())
return nullptr;
if (IntrinsicID == Intrinsic::masked_load) {
auto *SrcPtr = Operands[0];
auto *Mask = Operands[2];

11
test/Analysis/ConstantFolding/vscale.ll
View File

@ -210,3 +210,14 @@ define <vscale x 4 x i32> @select() {
%r = select <vscale x 4 x i1> undef, <vscale x 4 x i32> zeroinitializer, <vscale x 4 x i32> undef
ret <vscale x 4 x i32> %r
}
declare <vscale x 16 x i8> @llvm.sadd.sat.nxv16i8(<vscale x 16 x i8>, <vscale x 16 x i8>)
define <vscale x 16 x i8> @call() {
; CHECK-LABEL: @call(
; CHECK-NEXT: [[R:%.*]] = call <vscale x 16 x i8> @llvm.sadd.sat.nxv16i8(<vscale x 16 x i8> undef, <vscale x 16 x i8> undef)
; CHECK-NEXT: ret <vscale x 16 x i8> [[R]]
;
%r = call <vscale x 16 x i8> @llvm.sadd.sat.nxv16i8(<vscale x 16 x i8> undef, <vscale x 16 x i8> undef)
ret <vscale x 16 x i8> %r
}