40 lines
1.8 KiB
LLVM
40 lines
1.8 KiB
LLVM
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; RUN: opt -early-cse -earlycse-debug-hash -S < %s | FileCheck %s
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target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
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target triple = "aarch64"
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; This test checks that SimplifyInstruction does not blow up in the face of
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; a scalable shufflevector. vscale is a constant value known only at runtime.
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; Therefore, it is not possible to know the concrete value of, or the length
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; of the mask at compile time. Simplifications that depend on the value
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; of the mask cannot be performed.
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; Given the fact that the value of the mask is unknown at compile time for
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; scalable vectors, very few simplifications will be done. Here, we want to
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; see that the instruction can be passed to SimplifyInstruction and not crash
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; the compiler. It happens to be the case that this will be the result.
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; CHECK-LABEL: define <vscale x 8 x i1> @vscale_version()
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; CHECK-NEXT: ret <vscale x 8 x i1> shufflevector (<vscale x 8 x i1> insertelement (<vscale x 8 x i1> poison, i1 true, i32 0), <vscale x 8 x i1> undef, <vscale x 8 x i32> zeroinitializer)
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define <vscale x 8 x i1> @vscale_version() {
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%splatter = insertelement <vscale x 8 x i1> poison, i1 true, i32 0
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%foo = shufflevector <vscale x 8 x i1> %splatter,
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<vscale x 8 x i1> undef,
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<vscale x 8 x i32> zeroinitializer
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ret <vscale x 8 x i1> %foo
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}
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; The non-scalable version should be optimized as normal.
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; CHECK-LABEL: define <8 x i1> @fixed_length_version() {
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; CHECK-NEXT: ret <8 x i1> <i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true>
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define <8 x i1> @fixed_length_version() {
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%splatter = insertelement <8 x i1> poison, i1 true, i32 0
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%foo = shufflevector <8 x i1> %splatter,
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<8 x i1> undef,
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<8 x i32> zeroinitializer
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ret <8 x i1> %foo
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}
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