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https://github.com/c64scene-ar/llvm-6502.git
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a52ddfa930
This solves PR22276. Splats of constants would sometimes produce redundant shuffles, sometimes ridiculously so (see the PR for details). Fold these shuffles into BUILD_VECTORs early on instead. Differential Revision: http://reviews.llvm.org/D7093 Fixed recommit of r226811. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226816 91177308-0d34-0410-b5e6-96231b3b80d8
41 lines
1.5 KiB
LLVM
41 lines
1.5 KiB
LLVM
; RUN: llc < %s -mcpu=penryn | FileCheck %s --check-prefix=SSE
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; RUN: llc < %s -mcpu=sandybridge | FileCheck %s --check-prefix=AVX
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; RUN: llc < %s -mcpu=haswell | FileCheck %s --check-prefix=AVX2
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; This checks that lowering for creation of constant vectors is sane and
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; doesn't use redundant shuffles. (fixes PR22276)
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target triple = "x86_64-unknown-unknown"
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define <4 x i32> @zero_vector() {
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; SSE-LABEL: zero_vector:
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; SSE: xorps %xmm0, %xmm0
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; SSE-NEXT: retq
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; AVX-LABEL: zero_vector:
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; AVX: vxorps %xmm0, %xmm0, %xmm0
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; AVX-NEXT: retq
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; AVX2-LABEL: zero_vector:
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; AVX2: vxorps %xmm0, %xmm0, %xmm0
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; AVX2-NEXT: retq
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%zero = insertelement <4 x i32> undef, i32 0, i32 0
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%splat = shufflevector <4 x i32> %zero, <4 x i32> undef, <4 x i32> zeroinitializer
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ret <4 x i32> %splat
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}
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; Note that for the "const_vector" versions, lowering that uses a shuffle
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; instead of a load would be legitimate, if it's a single broadcast shuffle.
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; (as opposed to the previous mess)
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; However, this is not the current preferred lowering.
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define <4 x i32> @const_vector() {
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; SSE-LABEL: const_vector:
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; SSE: movaps {{.*}}, %xmm0 # xmm0 = [42,42,42,42]
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; SSE-NEXT: retq
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; AVX-LABEL: const_vector:
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; AVX: vmovaps {{.*}}, %xmm0 # xmm0 = [42,42,42,42]
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; AVX-NEXT: retq
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; AVX2-LABEL: const_vector:
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; AVX2: vbroadcastss {{[^%].*}}, %xmm0
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; AVX2-NEXT: retq
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%const = insertelement <4 x i32> undef, i32 42, i32 0
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%splat = shufflevector <4 x i32> %const, <4 x i32> undef, <4 x i32> zeroinitializer
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ret <4 x i32> %splat
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}
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