a105877646
The idea behind this canonicalization is that it allows us to handle less patterns, because we know that some will be canonicalized away. This is indeed very useful to e.g. know that constants are always on the right. However, this is only useful if the canonicalization is actually reliable. This is the case for constants, but not for arguments: Moving these to the right makes it look like the "more complex" expression is guaranteed to be on the left, but this is not actually the case in practice. It fails as soon as you replace the argument with another instruction. The end result is that it looks like things correctly work in tests, while they actually don't. We use the "thwart complexity-based canonicalization" trick to handle this in tests, but it's often a challenge for new contributors to get this right, and based on the regressions this PR originally exposed, we clearly don't get this right in many cases. For this reason, I think that it's better to remove this complexity canonicalization. It will make it much easier to write tests for commuted cases and make sure that they are handled.
223 lines
12 KiB
LLVM
223 lines
12 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes='instcombine' -S %s | FileCheck %s
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define <4 x i8> @splat_binop_non_splat_x(<4 x i8> %x, <4 x i8> %y) {
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; CHECK-LABEL: @splat_binop_non_splat_x(
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; CHECK-NEXT: [[XSPLAT:%.*]] = shufflevector <4 x i8> [[X:%.*]], <4 x i8> poison, <4 x i32> <i32 0, i32 2, i32 poison, i32 poison>
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; CHECK-NEXT: call void @use(<4 x i8> [[XSPLAT]])
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; CHECK-NEXT: [[B:%.*]] = add <4 x i8> [[XSPLAT]], [[Y:%.*]]
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; CHECK-NEXT: [[BSPLAT:%.*]] = shufflevector <4 x i8> [[B]], <4 x i8> poison, <4 x i32> zeroinitializer
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; CHECK-NEXT: ret <4 x i8> [[BSPLAT]]
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;
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%xsplat = shufflevector <4 x i8> %x, <4 x i8> poison, <4 x i32> <i32 0, i32 2, i32 4, i32 6>
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call void @use(<4 x i8> %xsplat)
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%b = add <4 x i8> %xsplat, %y
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%bsplat = shufflevector <4 x i8> %b, <4 x i8> poison, <4 x i32> zeroinitializer
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ret <4 x i8> %bsplat
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}
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define <4 x i8> @non_splat_binop_splat_x(<4 x i8> %x, <4 x i8> %y) {
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; CHECK-LABEL: @non_splat_binop_splat_x(
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; CHECK-NEXT: [[XSPLAT:%.*]] = shufflevector <4 x i8> [[X:%.*]], <4 x i8> poison, <4 x i32> zeroinitializer
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; CHECK-NEXT: call void @use(<4 x i8> [[XSPLAT]])
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; CHECK-NEXT: [[B:%.*]] = sub <4 x i8> [[XSPLAT]], [[Y:%.*]]
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; CHECK-NEXT: [[BSPLAT:%.*]] = shufflevector <4 x i8> [[B]], <4 x i8> poison, <4 x i32> <i32 0, i32 2, i32 poison, i32 poison>
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; CHECK-NEXT: ret <4 x i8> [[BSPLAT]]
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;
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%xsplat = shufflevector <4 x i8> %x, <4 x i8> poison, <4 x i32> zeroinitializer
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call void @use(<4 x i8> %xsplat)
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%b = sub <4 x i8> %xsplat, %y
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%bsplat = shufflevector <4 x i8> %b, <4 x i8> poison, <4 x i32> <i32 0, i32 2, i32 4, i32 6>
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ret <4 x i8> %bsplat
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}
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define <4 x i32> @splat_binop_splat_changes_x_length(<8 x i32> %x, <4 x i32> %y) {
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; CHECK-LABEL: @splat_binop_splat_changes_x_length(
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; CHECK-NEXT: [[XSPLAT:%.*]] = shufflevector <8 x i32> [[X:%.*]], <8 x i32> poison, <4 x i32> zeroinitializer
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; CHECK-NEXT: call void @use(<4 x i32> [[XSPLAT]])
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; CHECK-NEXT: [[B:%.*]] = mul <4 x i32> [[XSPLAT]], [[Y:%.*]]
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; CHECK-NEXT: [[BSPLAT:%.*]] = shufflevector <4 x i32> [[B]], <4 x i32> poison, <4 x i32> zeroinitializer
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; CHECK-NEXT: ret <4 x i32> [[BSPLAT]]
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;
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%xsplat = shufflevector <8 x i32> %x, <8 x i32> poison, <4 x i32> zeroinitializer
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call void @use(<4 x i32> %xsplat)
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%b = mul <4 x i32> %xsplat, %y
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%bsplat = shufflevector <4 x i32> %b, <4 x i32> poison, <4 x i32> zeroinitializer
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ret <4 x i32> %bsplat
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}
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define <4 x i8> @splat_binop_splat_x(<4 x i8> %x, <4 x i8> %y) {
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; CHECK-LABEL: @splat_binop_splat_x(
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; CHECK-NEXT: [[XSPLAT:%.*]] = shufflevector <4 x i8> [[X:%.*]], <4 x i8> poison, <4 x i32> zeroinitializer
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; CHECK-NEXT: call void @use(<4 x i8> [[XSPLAT]])
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; CHECK-NEXT: [[TMP1:%.*]] = add nsw <4 x i8> [[X]], [[Y:%.*]]
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; CHECK-NEXT: [[BSPLAT:%.*]] = shufflevector <4 x i8> [[TMP1]], <4 x i8> poison, <4 x i32> zeroinitializer
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; CHECK-NEXT: ret <4 x i8> [[BSPLAT]]
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;
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%xsplat = shufflevector <4 x i8> %x, <4 x i8> poison, <4 x i32> zeroinitializer
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call void @use(<4 x i8> %xsplat)
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%b = add nsw <4 x i8> %xsplat, %y
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%bsplat = shufflevector <4 x i8> %b, <4 x i8> poison, <4 x i32> zeroinitializer
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ret <4 x i8> %bsplat
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}
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define <4 x i8> @splat_binop_splat_y(<4 x i8> %x, <4 x i8> %y) {
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; CHECK-LABEL: @splat_binop_splat_y(
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; CHECK-NEXT: [[YSPLAT:%.*]] = shufflevector <4 x i8> [[Y:%.*]], <4 x i8> poison, <4 x i32> zeroinitializer
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; CHECK-NEXT: call void @use(<4 x i8> [[YSPLAT]])
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; CHECK-NEXT: [[TMP1:%.*]] = sub <4 x i8> [[X:%.*]], [[Y]]
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; CHECK-NEXT: [[BSPLAT:%.*]] = shufflevector <4 x i8> [[TMP1]], <4 x i8> poison, <4 x i32> <i32 poison, i32 0, i32 0, i32 0>
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; CHECK-NEXT: ret <4 x i8> [[BSPLAT]]
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;
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%ysplat = shufflevector <4 x i8> %y, <4 x i8> poison, <4 x i32> zeroinitializer
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call void @use(<4 x i8> %ysplat)
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%b = sub <4 x i8> %x, %ysplat
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%bsplat = shufflevector <4 x i8> %b, <4 x i8> poison, <4 x i32><i32 poison, i32 0, i32 0, i32 0>
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ret <4 x i8> %bsplat
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}
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define <4 x i8> @splat_binop_splat_x_splat_y(<4 x i8> %x, <4 x i8> %y) {
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; CHECK-LABEL: @splat_binop_splat_x_splat_y(
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; CHECK-NEXT: [[XSPLAT:%.*]] = shufflevector <4 x i8> [[X:%.*]], <4 x i8> poison, <4 x i32> zeroinitializer
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; CHECK-NEXT: call void @use(<4 x i8> [[XSPLAT]])
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; CHECK-NEXT: [[YSPLAT:%.*]] = shufflevector <4 x i8> [[Y:%.*]], <4 x i8> poison, <4 x i32> zeroinitializer
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; CHECK-NEXT: call void @use(<4 x i8> [[YSPLAT]])
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; CHECK-NEXT: [[TMP1:%.*]] = mul nuw <4 x i8> [[X]], [[Y]]
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; CHECK-NEXT: [[BSPLAT:%.*]] = shufflevector <4 x i8> [[TMP1]], <4 x i8> poison, <4 x i32> zeroinitializer
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; CHECK-NEXT: ret <4 x i8> [[BSPLAT]]
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;
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%xsplat = shufflevector <4 x i8> %x, <4 x i8> poison, <4 x i32> zeroinitializer
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call void @use(<4 x i8> %xsplat)
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%ysplat = shufflevector <4 x i8> %y, <4 x i8> poison, <4 x i32> zeroinitializer
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call void @use(<4 x i8> %ysplat)
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%b = mul nuw <4 x i8> %xsplat, %ysplat
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%bsplat = shufflevector <4 x i8> %b, <4 x i8> poison, <4 x i32> zeroinitializer
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ret <4 x i8> %bsplat
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}
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define <4 x float> @splat_binop_splat_x_splat_y_fmath_flags(<4 x float> %x, <4 x float> %y) {
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; CHECK-LABEL: @splat_binop_splat_x_splat_y_fmath_flags(
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; CHECK-NEXT: [[XSPLAT:%.*]] = shufflevector <4 x float> [[X:%.*]], <4 x float> poison, <4 x i32> zeroinitializer
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; CHECK-NEXT: call void @use(<4 x float> [[XSPLAT]])
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; CHECK-NEXT: [[YSPLAT:%.*]] = shufflevector <4 x float> [[Y:%.*]], <4 x float> poison, <4 x i32> zeroinitializer
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; CHECK-NEXT: call void @use(<4 x float> [[YSPLAT]])
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; CHECK-NEXT: [[TMP1:%.*]] = fmul fast <4 x float> [[X]], [[Y]]
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; CHECK-NEXT: [[BSPLAT:%.*]] = shufflevector <4 x float> [[TMP1]], <4 x float> poison, <4 x i32> zeroinitializer
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; CHECK-NEXT: ret <4 x float> [[BSPLAT]]
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;
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%xsplat = shufflevector <4 x float> %x, <4 x float> poison, <4 x i32> zeroinitializer
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call void @use(<4 x float> %xsplat)
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%ysplat = shufflevector <4 x float> %y, <4 x float> poison, <4 x i32> zeroinitializer
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call void @use(<4 x float> %ysplat)
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%b = fmul fast <4 x float> %xsplat, %ysplat
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%bsplat = shufflevector <4 x float> %b, <4 x float> poison, <4 x i32> zeroinitializer
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ret <4 x float> %bsplat
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}
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define <vscale x 4 x i32> @vscale_splat_udiv_splat_x(<vscale x 4 x i32> %x, <vscale x 4 x i32> %y) {
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; CHECK-LABEL: @vscale_splat_udiv_splat_x(
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; CHECK-NEXT: [[XSPLAT:%.*]] = shufflevector <vscale x 4 x i32> [[X:%.*]], <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer
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; CHECK-NEXT: [[B:%.*]] = udiv <vscale x 4 x i32> [[XSPLAT]], [[Y:%.*]]
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; CHECK-NEXT: [[BSPLAT:%.*]] = shufflevector <vscale x 4 x i32> [[B]], <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer
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; CHECK-NEXT: ret <vscale x 4 x i32> [[BSPLAT]]
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;
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%xsplat = shufflevector <vscale x 4 x i32> %x, <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer
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%b = udiv <vscale x 4 x i32> %xsplat, %y
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%bsplat = shufflevector <vscale x 4 x i32> %b, <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer
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ret <vscale x 4 x i32> %bsplat
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}
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define <vscale x 4 x i32> @vscale_splat_urem_splat_x(<vscale x 4 x i32> %x, <vscale x 4 x i32> %y) {
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; CHECK-LABEL: @vscale_splat_urem_splat_x(
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; CHECK-NEXT: [[XSPLAT:%.*]] = shufflevector <vscale x 4 x i32> [[X:%.*]], <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer
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; CHECK-NEXT: [[B:%.*]] = urem <vscale x 4 x i32> [[XSPLAT]], [[Y:%.*]]
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; CHECK-NEXT: [[BSPLAT:%.*]] = shufflevector <vscale x 4 x i32> [[B]], <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer
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; CHECK-NEXT: ret <vscale x 4 x i32> [[BSPLAT]]
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;
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%xsplat = shufflevector <vscale x 4 x i32> %x, <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer
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%b = urem <vscale x 4 x i32> %xsplat, %y
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%bsplat = shufflevector <vscale x 4 x i32> %b, <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer
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ret <vscale x 4 x i32> %bsplat
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}
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define <vscale x 4 x i32> @vscale_splat_binop_splat_y(<vscale x 4 x i32> %x, <vscale x 4 x i32> %y) {
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; CHECK-LABEL: @vscale_splat_binop_splat_y(
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; CHECK-NEXT: [[YSPLAT:%.*]] = shufflevector <vscale x 4 x i32> [[Y:%.*]], <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer
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; CHECK-NEXT: [[B:%.*]] = sdiv <vscale x 4 x i32> [[X:%.*]], [[YSPLAT]]
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; CHECK-NEXT: [[BSPLAT:%.*]] = shufflevector <vscale x 4 x i32> [[B]], <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer
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; CHECK-NEXT: ret <vscale x 4 x i32> [[BSPLAT]]
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;
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%ysplat = shufflevector <vscale x 4 x i32> %y, <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer
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%b = sdiv <vscale x 4 x i32> %x, %ysplat
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%bsplat = shufflevector <vscale x 4 x i32> %b, <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer
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ret <vscale x 4 x i32> %bsplat
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}
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define <vscale x 4 x i32> @vscale_splat_binop_splat_x_splat_y(<vscale x 4 x i32> %x, <vscale x 4 x i32> %y) {
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; CHECK-LABEL: @vscale_splat_binop_splat_x_splat_y(
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; CHECK-NEXT: [[TMP1:%.*]] = ashr <vscale x 4 x i32> [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: [[B:%.*]] = shufflevector <vscale x 4 x i32> [[TMP1]], <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer
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; CHECK-NEXT: ret <vscale x 4 x i32> [[B]]
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;
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%xsplat = shufflevector <vscale x 4 x i32> %x, <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer
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%ysplat = shufflevector <vscale x 4 x i32> %y, <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer
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%b = ashr <vscale x 4 x i32> %xsplat, %ysplat
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%bsplat = shufflevector <vscale x 4 x i32> %b, <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer
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ret <vscale x 4 x i32> %bsplat
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}
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define <vscale x 4 x i32> @vscale_splat_binop_splat_x_splat_y_calls(<vscale x 4 x i32> %x, <vscale x 4 x i32> %y) {
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; CHECK-LABEL: @vscale_splat_binop_splat_x_splat_y_calls(
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; CHECK-NEXT: [[XSPLAT:%.*]] = shufflevector <vscale x 4 x i32> [[X:%.*]], <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer
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; CHECK-NEXT: call void @use_v(<vscale x 4 x i32> [[XSPLAT]])
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; CHECK-NEXT: [[YSPLAT:%.*]] = shufflevector <vscale x 4 x i32> [[Y:%.*]], <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer
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; CHECK-NEXT: call void @use_v(<vscale x 4 x i32> [[YSPLAT]])
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; CHECK-NEXT: [[TMP1:%.*]] = lshr <vscale x 4 x i32> [[X]], [[Y]]
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; CHECK-NEXT: [[BSPLAT:%.*]] = shufflevector <vscale x 4 x i32> [[TMP1]], <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer
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; CHECK-NEXT: ret <vscale x 4 x i32> [[BSPLAT]]
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;
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%xsplat = shufflevector <vscale x 4 x i32> %x, <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer
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call void @use_v(<vscale x 4 x i32> %xsplat)
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%ysplat = shufflevector <vscale x 4 x i32> %y, <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer
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call void @use_v(<vscale x 4 x i32> %ysplat)
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%b = lshr <vscale x 4 x i32> %xsplat, %ysplat
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%bsplat = shufflevector <vscale x 4 x i32> %b, <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer
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ret <vscale x 4 x i32> %bsplat
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}
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define <2 x double> @shuffle_op2_0th_element_mask(ptr %a, ptr %b) {
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; CHECK-LABEL: @shuffle_op2_0th_element_mask(
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; CHECK-NEXT: [[TMP1:%.*]] = load <2 x double>, ptr [[A:%.*]], align 16
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; CHECK-NEXT: [[TMP2:%.*]] = load <2 x double>, ptr [[B:%.*]], align 16
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; CHECK-NEXT: [[TMP3:%.*]] = fsub <2 x double> [[TMP2]], [[TMP1]]
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; CHECK-NEXT: [[SHUFFLE:%.*]] = shufflevector <2 x double> [[TMP3]], <2 x double> poison, <2 x i32> zeroinitializer
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; CHECK-NEXT: ret <2 x double> [[SHUFFLE]]
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;
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%1 = load <2 x double>, ptr %a, align 16
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%2 = shufflevector <2 x double> %1, <2 x double> poison, <2 x i32> zeroinitializer
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%3 = load <2 x double>, ptr %b, align 16
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%sub = fsub <2 x double> %3, %2
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%shuffle = shufflevector <2 x double> %sub, <2 x double> %sub, <2 x i32> <i32 2, i32 2>
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ret <2 x double> %shuffle
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}
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; This should not create an extra binop.
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define <2 x i4> @splat_binop_splat_uses(<2 x i4> %x, <2 x i4> %y) {
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; CHECK-LABEL: @splat_binop_splat_uses(
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; CHECK-NEXT: [[XSPLAT:%.*]] = shufflevector <2 x i4> [[X:%.*]], <2 x i4> poison, <2 x i32> zeroinitializer
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; CHECK-NEXT: [[XY:%.*]] = mul <2 x i4> [[XSPLAT]], [[Y:%.*]]
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; CHECK-NEXT: [[MSPLAT:%.*]] = shufflevector <2 x i4> [[XY]], <2 x i4> poison, <2 x i32> zeroinitializer
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; CHECK-NEXT: [[RES:%.*]] = add <2 x i4> [[XY]], [[MSPLAT]]
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; CHECK-NEXT: ret <2 x i4> [[RES]]
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;
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%xsplat = shufflevector <2 x i4> %x, <2 x i4> poison, <2 x i32> zeroinitializer
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%xy = mul <2 x i4> %xsplat, %y
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%msplat = shufflevector <2 x i4> %xy, <2 x i4> poison, <2 x i32> zeroinitializer
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%res = add <2 x i4> %xy, %msplat
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ret <2 x i4> %res
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}
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declare void @use(<4 x i8>)
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declare void @use_v(<vscale x 4 x i32>)
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