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[SelectionDAG] soften assertion when legalizing narrow vector FP ops

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The test based on PR42010:
https://bugs.llvm.org/show_bug.cgi?id=42010
...may show an inaccuracy for PPC's target defs, but we should not
be so aggressive with an assert here. There's no telling what out-of-tree
targets look like.

llvm-svn: 361696
This commit is contained in:
Sanjay Patel 2019-05-25 13:48:07 +00:00
parent 33891f02e2
commit 67b43d983f
2 changed files with 28 additions and 6 deletions
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8
lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
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@ -2743,13 +2743,11 @@ void DAGTypeLegalizer::WidenVectorResult(SDNode *N, unsigned ResNo) {
// We're going to widen this vector op to a legal type by padding with undef
// elements. If the wide vector op is eventually going to be expanded to
// scalar libcalls, then unroll into scalar ops now to avoid unnecessary
// libcalls on the undef elements. We are assuming that if the scalar op
// requires expanding, then the vector op needs expanding too.
// libcalls on the undef elements.
EVT VT = N->getValueType(0);
if (TLI.isOperationExpand(N->getOpcode(), VT.getScalarType())) {
EVT WideVecVT = TLI.getTypeToTransformTo(*DAG.getContext(), VT);
assert(!TLI.isOperationLegalOrCustom(N->getOpcode(), WideVecVT) &&
"Target supports vector op, but scalar requires expansion?");
if (!TLI.isOperationLegalOrCustom(N->getOpcode(), WideVecVT) &&
TLI.isOperationExpand(N->getOpcode(), VT.getScalarType())) {
Res = DAG.UnrollVectorOp(N, WideVecVT.getVectorNumElements());
break;
}

24
test/CodeGen/PowerPC/ftrunc-legalize.ll Normal file
View File

@ -0,0 +1,24 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=powerpc64-- -mattr=altivec -verify-machineinstrs < %s | FileCheck %s
; This would assert because the widened vector op is
; legal/custom, but the scalar op is expanded.
define i32 @PR42010(<2 x float> %x) {
; CHECK-LABEL: PR42010:
; CHECK: # %bb.0:
; CHECK-NEXT: addi 3, 1, -32
; CHECK-NEXT: vrfiz 2, 2
; CHECK-NEXT: stvx 2, 0, 3
; CHECK-NEXT: lfs 0, -28(1)
; CHECK-NEXT: fctiwz 0, 0
; CHECK-NEXT: stfd 0, -8(1)
; CHECK-NEXT: lwz 3, -4(1)
; CHECK-NEXT: blr
%t0 = call <2 x float> @llvm.trunc.v2f32(<2 x float> %x)
%t1 = extractelement <2 x float> %t0, i32 1
%t2 = fptosi float %t1 to i32
ret i32 %t2
}
declare <2 x float> @llvm.trunc.v2f32(<2 x float>)