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66649e00c9
We already do: concat_vectors(scalar, undef) -> scalar_to_vector(scalar) When the scalar is legal. When it's not, but is a truncated legal scalar, we can also do: concat_vectors(trunc(scalar), undef) -> scalar_to_vector(scalar) Which is equivalent, since the upper lanes are undef anyway. While there, teach the combine to look at more than 2 operands. Differential Revision: http://reviews.llvm.org/D8883 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234530 91177308-0d34-0410-b5e6-96231b3b80d8
19 lines
608 B
LLVM
19 lines
608 B
LLVM
; RUN: llc < %s -mtriple aarch64-unknown-unknown -asm-verbose=false | FileCheck %s
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target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
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; Test the (concat_vectors (bitcast (trunc (scalar))), undef..) pattern.
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define <8 x i8> @test_concat_from_truncated_scalar(i32 %x) #0 {
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entry:
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; CHECK-LABEL: test_concat_from_truncated_scalar:
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; CHECK-NEXT: fmov s0, w0
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; CHECK-NEXT: ret
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%t = trunc i32 %x to i16
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%0 = bitcast i16 %t to <2 x i8>
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%1 = shufflevector <2 x i8> %0, <2 x i8> undef, <8 x i32> <i32 0, i32 1, i32 2, i32 2, i32 2, i32 2, i32 2, i32 2>
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ret <8 x i8> %1
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}
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attributes #0 = { nounwind }
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