3212a08a8c
A ConstantAggregateZero may be created from a scalable vector type. However, it still assumed fixed number of elements when queried for them. This patch changes ConstantAggregateZero to correctly report its element count. This change fixes a couple of issues. Firstly, it fixes a crash in Constant::getUniqueValue when called on a scalable-vector zeroinitializer constant. Secondly, it fixes a latent bug in GlobalISel's IRTranslator in which translating a scalable-vector zeroinitializer would hit the assertion in ConstantAggregateZero::getNumElements when casting to a FixedVectorType, rather than reporting an error more gracefully. This is currently hypothetical as the IRTranslator has deeper issues preventing the use of scalable vector types. Reviewed By: RKSimon Differential Revision: https://reviews.llvm.org/D102082
18 lines
1.1 KiB
LLVM
18 lines
1.1 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -instcombine -S < %s | FileCheck %s
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; This test checks a regression in the select operand folding combine, in which
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; Constant::getUniqueInteger would crash for a scalable-vector zeroinitializer.
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define <vscale x 1 x i32> @select_opt(<vscale x 1 x i32> %b, <vscale x 1 x i1> %m) {
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; CHECK-LABEL: @select_opt(
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; CHECK-NEXT: [[C:%.*]] = add nsw <vscale x 1 x i32> [[B:%.*]], shufflevector (<vscale x 1 x i32> insertelement (<vscale x 1 x i32> undef, i32 2, i32 0), <vscale x 1 x i32> undef, <vscale x 1 x i32> zeroinitializer)
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; CHECK-NEXT: [[D:%.*]] = select <vscale x 1 x i1> [[M:%.*]], <vscale x 1 x i32> [[C]], <vscale x 1 x i32> [[B]]
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; CHECK-NEXT: ret <vscale x 1 x i32> [[D]]
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;
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%head = insertelement <vscale x 1 x i32> undef, i32 2, i32 0
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%splat = shufflevector <vscale x 1 x i32> %head, <vscale x 1 x i32> undef, <vscale x 1 x i32> zeroinitializer
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%c = add nsw <vscale x 1 x i32> %b, %splat
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%d = select <vscale x 1 x i1> %m, <vscale x 1 x i32> %c, <vscale x 1 x i32> %b
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ret <vscale x 1 x i32> %d
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}
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