b4f04d7135
First, shuffle cost for scalable type is not known for scalable type; Second, we cannot reason if the narrowed shuffle mask for scalable type is a splat or not. E.g., Bitcast splat vector from type <vscale x 4 x i32> to <vscale x 8 x i16> will involve narrowing shuffle mask <vscale x 4 x i32> zeroinitializer to <vscale x 8 x i32> with element sequence of <0, 1, 0, 1, ...>, which cannot be reasoned if it's a valid splat or not. Reviewed By: spatel Differential Revision: https://reviews.llvm.org/D86995
22 lines
1.1 KiB
LLVM
22 lines
1.1 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -vector-combine -S -mtriple=aarch64-- | FileCheck %s --check-prefixes=CHECK
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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-unknown-linux-gnu"
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; This test checks we are not crashing with TTI when trying to get shuffle cost.
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; This test also check that shuffle mask <vscale x 4 x i32> zeroinitializer is
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; not narrowed into <0, 1, 0, 1, ...>, which we cannot reason if it's a valid
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; splat or not.
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define <vscale x 8 x i16> @bitcast_shuffle(<vscale x 4 x i32> %a) {
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; CHECK-LABEL: @bitcast_shuffle(
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; CHECK-NEXT: [[I:%.*]] = shufflevector <vscale x 4 x i32> [[A:%.*]], <vscale x 4 x i32> undef, <vscale x 4 x i32> zeroinitializer
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; CHECK-NEXT: [[R:%.*]] = bitcast <vscale x 4 x i32> [[I]] to <vscale x 8 x i16>
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; CHECK-NEXT: ret <vscale x 8 x i16> [[R]]
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;
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%i = shufflevector <vscale x 4 x i32> %a, <vscale x 4 x i32> undef, <vscale x 4 x i32> zeroinitializer
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%r = bitcast <vscale x 4 x i32> %i to <vscale x 8 x i16>
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ret <vscale x 8 x i16> %r
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}
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