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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
44 lines
1.5 KiB
LLVM
44 lines
1.5 KiB
LLVM
; RUN: llc < %s -mtriple arm64-apple-darwin -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 (trunc), (trunc)) pattern.
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define <4 x i16> @test_concat_truncate_v2i64_to_v4i16(<2 x i64> %a, <2 x i64> %b) #0 {
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entry:
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; CHECK-LABEL: test_concat_truncate_v2i64_to_v4i16:
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; CHECK-NEXT: uzp1.4s v0, v0, v1
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; CHECK-NEXT: xtn.4h v0, v0
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; CHECK-NEXT: ret
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%at = trunc <2 x i64> %a to <2 x i16>
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%bt = trunc <2 x i64> %b to <2 x i16>
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%shuffle = shufflevector <2 x i16> %at, <2 x i16> %bt, <4 x i32> <i32 0, i32 1, i32 2, i32 3>
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ret <4 x i16> %shuffle
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}
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define <8 x i8> @test_concat_truncate_v4i32_to_v8i8(<4 x i32> %a, <4 x i32> %b) #0 {
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entry:
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; CHECK-LABEL: test_concat_truncate_v4i32_to_v8i8:
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; CHECK-NEXT: uzp1.8h v0, v0, v1
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; CHECK-NEXT: xtn.8b v0, v0
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; CHECK-NEXT: ret
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%at = trunc <4 x i32> %a to <4 x i8>
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%bt = trunc <4 x i32> %b to <4 x i8>
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%shuffle = shufflevector <4 x i8> %at, <4 x i8> %bt, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
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ret <8 x i8> %shuffle
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}
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define <8 x i16> @test_concat_truncate_v4i32_to_v8i16(<4 x i32> %a, <4 x i32> %b) #0 {
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entry:
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; CHECK-LABEL: test_concat_truncate_v4i32_to_v8i16:
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; CHECK-NEXT: xtn.4h v0, v0
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; CHECK-NEXT: xtn2.8h v0, v1
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; CHECK-NEXT: ret
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%at = trunc <4 x i32> %a to <4 x i16>
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%bt = trunc <4 x i32> %b to <4 x i16>
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%shuffle = shufflevector <4 x i16> %at, <4 x i16> %bt, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
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ret <8 x i16> %shuffle
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}
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attributes #0 = { nounwind }
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