4a8e6ed2f7
This patch makes SLP and LV emit operations with initial vectors set to poison constant instead of undef. This is a part of efforts for using poison vector instead of undef to represent "doesn't care" vector. The goal is to make nice shufflevector optimizations valid that is currently incorrect due to the tricky interaction between undef and poison (see https://bugs.llvm.org/show_bug.cgi?id=44185 ). Reviewed By: fhahn Differential Revision: https://reviews.llvm.org/D94061
109 lines
4.3 KiB
LLVM
109 lines
4.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -slp-vectorizer < %s -S -mtriple="x86_64-grtev3-linux-gnu" -mcpu=corei7-avx | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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; We used to crash on this example because we were building a constant
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; expression during vectorization and the vectorizer expects instructions
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; as elements of the vectorized tree.
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; PR19621
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define void @test() {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: bb279:
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; CHECK-NEXT: [[TMP0:%.*]] = insertelement <2 x float> poison, float undef, i32 0
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; CHECK-NEXT: [[TMP1:%.*]] = insertelement <2 x float> [[TMP0]], float undef, i32 1
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; CHECK-NEXT: br label [[BB283:%.*]]
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; CHECK: bb283:
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; CHECK-NEXT: [[TMP2:%.*]] = phi <2 x float> [ undef, [[BB279:%.*]] ], [ [[TMP13:%.*]], [[EXIT:%.*]] ]
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; CHECK-NEXT: [[TMP3:%.*]] = phi <2 x float> [ undef, [[BB279]] ], [ [[TMP1]], [[EXIT]] ]
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; CHECK-NEXT: br label [[BB284:%.*]]
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; CHECK: bb284:
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; CHECK-NEXT: [[TMP4:%.*]] = fpext <2 x float> [[TMP2]] to <2 x double>
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; CHECK-NEXT: [[TMP5:%.*]] = fsub <2 x double> [[TMP4]], undef
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; CHECK-NEXT: [[TMP6:%.*]] = fsub <2 x double> [[TMP5]], undef
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; CHECK-NEXT: br label [[BB21_I:%.*]]
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; CHECK: bb21.i:
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; CHECK-NEXT: br i1 undef, label [[BB22_I:%.*]], label [[EXIT]]
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; CHECK: bb22.i:
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; CHECK-NEXT: [[TMP7:%.*]] = fadd <2 x double> undef, [[TMP6]]
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; CHECK-NEXT: br label [[BB32_I:%.*]]
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; CHECK: bb32.i:
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; CHECK-NEXT: [[TMP8:%.*]] = phi <2 x double> [ [[TMP7]], [[BB22_I]] ], [ zeroinitializer, [[BB32_I]] ]
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; CHECK-NEXT: br i1 undef, label [[BB32_I]], label [[BB21_I]]
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; CHECK: exit:
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; CHECK-NEXT: [[TMP9:%.*]] = fpext <2 x float> [[TMP3]] to <2 x double>
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; CHECK-NEXT: [[TMP10:%.*]] = fmul <2 x double> [[TMP9]], <double undef, double 0.000000e+00>
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; CHECK-NEXT: [[TMP11:%.*]] = fadd <2 x double> undef, [[TMP10]]
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; CHECK-NEXT: [[TMP12:%.*]] = fadd <2 x double> [[TMP11]], undef
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; CHECK-NEXT: [[TMP13]] = fptrunc <2 x double> [[TMP12]] to <2 x float>
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; CHECK-NEXT: br label [[BB283]]
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;
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bb279:
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br label %bb283
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bb283:
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%Av.sroa.8.0 = phi float [ undef, %bb279 ], [ %tmp315, %exit ]
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%Av.sroa.5.0 = phi float [ undef, %bb279 ], [ %tmp319, %exit ]
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%Av.sroa.3.0 = phi float [ undef, %bb279 ], [ %tmp307, %exit ]
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%Av.sroa.0.0 = phi float [ undef, %bb279 ], [ %tmp317, %exit ]
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br label %bb284
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bb284:
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%tmp7.i = fpext float %Av.sroa.3.0 to double
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%tmp8.i = fsub double %tmp7.i, undef
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%tmp9.i = fsub double %tmp8.i, undef
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%tmp17.i = fpext float %Av.sroa.8.0 to double
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%tmp19.i = fsub double %tmp17.i, undef
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%tmp20.i = fsub double %tmp19.i, undef
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br label %bb21.i
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bb21.i:
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br i1 undef, label %bb22.i, label %exit
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bb22.i:
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%tmp24.i = fadd double undef, %tmp9.i
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%tmp26.i = fadd double undef, %tmp20.i
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br label %bb32.i
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bb32.i:
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%xs.0.i = phi double [ %tmp24.i, %bb22.i ], [ 0.000000e+00, %bb32.i ]
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%ys.0.i = phi double [ %tmp26.i, %bb22.i ], [ 0.000000e+00, %bb32.i ]
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br i1 undef, label %bb32.i, label %bb21.i
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exit:
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%tmp303 = fpext float %Av.sroa.0.0 to double
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%tmp304 = fmul double %tmp303, undef
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%tmp305 = fadd double undef, %tmp304
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%tmp306 = fadd double %tmp305, undef
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%tmp307 = fptrunc double %tmp306 to float
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%tmp311 = fpext float %Av.sroa.5.0 to double
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%tmp312 = fmul double %tmp311, 0.000000e+00
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%tmp313 = fadd double undef, %tmp312
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%tmp314 = fadd double %tmp313, undef
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%tmp315 = fptrunc double %tmp314 to float
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%tmp317 = fptrunc double undef to float
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%tmp319 = fptrunc double undef to float
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br label %bb283
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}
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; Make sure that we probably handle constant folded vectorized trees. The
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; vectorizer starts at the type (%t2, %t3) and wil constant fold the tree.
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; The code that handles insertelement instructions must handle this.
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define <4 x double> @constant_folding() {
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; CHECK-LABEL: @constant_folding(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[I1:%.*]] = insertelement <4 x double> undef, double 1.000000e+00, i32 1
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; CHECK-NEXT: [[I2:%.*]] = insertelement <4 x double> [[I1]], double 2.000000e+00, i32 0
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; CHECK-NEXT: ret <4 x double> [[I2]]
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;
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entry:
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%t0 = fadd double 1.000000e+00 , 0.000000e+00
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%t1 = fadd double 1.000000e+00 , 1.000000e+00
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%t2 = fmul double %t0, 1.000000e+00
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%i1 = insertelement <4 x double> undef, double %t2, i32 1
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%t3 = fmul double %t1, 1.000000e+00
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%i2 = insertelement <4 x double> %i1, double %t3, i32 0
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ret <4 x double> %i2
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}
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