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b9dfeea817
If inserting more than one constant into a vector:
define <4 x float> @foo(<4 x float> %x) {
%ins1 = insertelement <4 x float> %x, float 1.0, i32 1
%ins2 = insertelement <4 x float> %ins1, float 2.0, i32 2
ret <4 x float> %ins2
}
InstCombine could reduce that to a shufflevector:
define <4 x float> @goo(<4 x float> %x) {
%shuf = shufflevector <4 x float> %x, <4 x float> <float undef, float 1.0, float 2.0, float undef>, <4 x i32><i32 0, i32 5, i32 6, i32 3>
ret <4 x float> %shuf
}
Also, InstCombine tries to convert shuffle instruction to single insertelement, if one of the vectors is a constant vector and only a single element from this constant should be used in shuffle, i.e.
shufflevector <4 x float> %v, <4 x float> <float undef, float 1.0, float
undef, float undef>, <4 x i32> <i32 0, i32 5, i32 undef, i32 undef> ->
insertelement <4 x float> %v, float 1.0, 1
Differential Revision: https://reviews.llvm.org/D24182
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@282237 91177308-0d34-0410-b5e6-96231b3b80d8
95 lines
3.8 KiB
LLVM
95 lines
3.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -instcombine -S | FileCheck %s
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define<4 x float> @foo(<4 x float> %x) {
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%ins1 = insertelement<4 x float> %x, float 1.0, i32 1
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%ins2 = insertelement<4 x float> %ins1, float 2.0, i32 2
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ret<4 x float> %ins2
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}
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; insertelements should fold to shuffle
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; CHECK-LABEL: @foo
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; CHECK-NEXT: shufflevector <4 x float> %{{.+}}, <4 x float> <float undef, float 1.000000e+00, float 2.000000e+00, float undef>, <4 x i32> <i32 0, i32 5, i32 6, i32 3>
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; CHECK-NEXT: ret <4 x float> %
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define<4 x float> @bar(<4 x float> %x, float %a) {
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%ins1 = insertelement<4 x float> %x, float %a, i32 1
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%ins2 = insertelement<4 x float> %ins1, float 2.0, i32 2
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ret<4 x float> %ins2
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}
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; CHECK-LABEL: @bar
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; CHECK-NEXT: insertelement <4 x float> %{{.+}}, float %{{.+}}, i32 1
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; CHECK-NEXT: insertelement <4 x float> %{{.+}}, float 2.000000e+00, i32 2
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; CHECK-NEXT: ret <4 x float> %
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define<4 x float> @baz(<4 x float> %x, i32 %a) {
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%ins1 = insertelement<4 x float> %x, float 1.0, i32 1
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%ins2 = insertelement<4 x float> %ins1, float 2.0, i32 %a
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ret<4 x float> %ins2
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}
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; CHECK-LABEL: @baz
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; CHECK-NEXT: insertelement <4 x float> %{{.+}}, float 1.000000e+00, i32 1
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; CHECK-NEXT: insertelement <4 x float> %ins1, float 2.000000e+00, i32 %
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; CHECK-NEXT: ret <4 x float> %
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define<4 x float> @bazz(<4 x float> %x, i32 %a) {
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%ins1 = insertelement<4 x float> %x, float 1.0, i32 3
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%ins2 = insertelement<4 x float> %ins1, float 5.0, i32 %a
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%ins3 = insertelement<4 x float> %ins2, float 3.0, i32 2
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%ins4 = insertelement<4 x float> %ins3, float 1.0, i32 1
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%ins5 = insertelement<4 x float> %ins4, float 2.0, i32 2
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%ins6 = insertelement<4 x float> %ins5, float 7.0, i32 %a
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ret<4 x float> %ins6
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}
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; insertelements should fold to shuffle
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; CHECK-LABEL: @bazz
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; CHECK-NEXT: insertelement <4 x float> %{{.+}}, float 1.000000e+00, i32 3
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; CHECK-NEXT: insertelement <4 x float> %{{.+}}, float 5.000000e+00, i32 %
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; CHECK-NEXT: shufflevector <4 x float> %{{.+}}, <4 x float> <float undef, float 1.000000e+00, float 2.000000e+00, float undef>, <4 x i32> <i32 0, i32 5, i32 6, i32 3>
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; CHECK-NEXT: insertelement <4 x float> %{{.+}}, float 7.000000e+00, i32 %
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; CHECK-NEXT: ret <4 x float> %
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define<4 x float> @bazzz(<4 x float> %x) {
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%ins1 = insertelement<4 x float> %x, float 1.0, i32 5
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%ins2 = insertelement<4 x float> %ins1, float 2.0, i32 2
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ret<4 x float> %ins2
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}
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; CHECK-LABEL: @bazzz
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; CHECK-NEXT: insertelement <4 x float> %{{.+}}, float 2.000000e+00, i32 2
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; CHECK-NEXT: ret <4 x float> %
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define<4 x float> @bazzzz(<4 x float> %x) {
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%ins1 = insertelement<4 x float> %x, float 1.0, i32 undef
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%ins2 = insertelement<4 x float> %ins1, float 2.0, i32 2
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ret<4 x float> %ins2
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}
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; CHECK-LABEL: @bazzzz
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; CHECK-NEXT: insertelement <4 x float> %{{.+}}, float 1.000000e+00, i32 undef
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; CHECK-NEXT: insertelement <4 x float> %{{.+}}, float 2.000000e+00, i32 2
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; CHECK-NEXT: ret <4 x float> %
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define<4 x float> @bazzzzz() {
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%ins1 = insertelement <4 x float> insertelement (<4 x float> <float 1.0, float 2.0, float 3.0, float undef>, float 4.0, i32 3), float 5.0, i32 1
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%ins2 = insertelement<4 x float> %ins1, float 10.0, i32 2
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ret<4 x float> %ins2
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}
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; insertelements should fold to shuffle
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; CHECK-LABEL: @bazzzzz
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; CHECK-NEXT: ret <4 x float> <float 1.000000e+00, float 5.000000e+00, float 1.000000e+01, float 4.000000e+00>
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define<4 x float> @bazzzzzz(<4 x float> %x, i32 %a) {
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%ins1 = insertelement <4 x float> insertelement (<4 x float> shufflevector (<4 x float> undef, <4 x float> <float 1.0, float 2.0, float 3.0, float 4.0> , <4 x i32> <i32 0, i32 5, i32 undef, i32 6> ), float 4.0, i32 3), float 5.0, i32 1
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ret<4 x float> %ins1
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}
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; insertelements should fold to shuffle
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; CHECK-LABEL: @bazzzzz
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; CHECK-NEXT: ret <4 x float> <float undef, float 5.000000e+00, float undef, float 4.000000e+00>
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