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clang-p2996/llvm/test/Transforms/LoopVectorize/ARM/sphinx.ll
Florian Hahn 23c2f2e6b2 [LV] Mark increment of main vector loop induction variable as NUW. 
This patch marks the induction increment of the main induction variable
of the vector loop as NUW when not folding the tail.

If the tail is not folded, we know that End - Start >= Step (either
statically or through the minimum iteration checks). We also know that both
Start % Step == 0 and End % Step == 0. We exit the vector loop if %IV +
%Step == %End. Hence we must exit the loop before %IV + %Step unsigned
overflows and we can mark the induction increment as NUW.

This should make SCEV return more precise bounds for the created vector
loops, used by later optimizations, like late unrolling.

At the moment quite a few tests still need to be updated, but before
doing so I'd like to get initial feedback to make sure I am not missing
anything.

Note that this could probably be further improved by using information
from the original IV.

Attempt of modeling of the assumption in Alive2:
https://alive2.llvm.org/ce/z/H_DL_g

Part of a set of fixes required for PR50412.

Reviewed By: mkazantsev

Differential Revision: https://reviews.llvm.org/D103255
2021-06-07 10:47:52 +01:00

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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -loop-vectorize -mtriple=thumbv8-unknown-unknown -mcpu=cortex-a53 -S | FileCheck %s
; This test is reduced from SPECFP 2006 482.sphinx.
; We expect vectorization with <2 x double> and <2 x float> ops.
; See https://bugs.llvm.org/show_bug.cgi?id=36280 for more details.
target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
@a = external global i32
@v = external global i32
@mm = external global float**
@vv = external global float**
@ll = external global float*
define i32 @test(float* nocapture readonly %x) {
; CHECK-LABEL: @test(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[T:%.*]] = load i32, i32* @v, align 8
; CHECK-NEXT: [[T1:%.*]] = load i32, i32* @a, align 4
; CHECK-NEXT: br label [[OUTERLOOP:%.*]]
; CHECK: outerloop:
; CHECK-NEXT: [[T2:%.*]] = phi i32 [ [[V17:%.*]], [[OUTEREND:%.*]] ], [ [[T1]], [[ENTRY:%.*]] ]
; CHECK-NEXT: [[J_0136:%.*]] = phi i32 [ [[INC144:%.*]], [[OUTEREND]] ], [ 0, [[ENTRY]] ]
; CHECK-NEXT: [[SCORE_1135:%.*]] = phi i32 [ [[CALL142:%.*]], [[OUTEREND]] ], [ -939524096, [[ENTRY]] ]
; CHECK-NEXT: [[T3:%.*]] = load float**, float*** @mm, align 4
; CHECK-NEXT: [[ARRAYIDX109:%.*]] = getelementptr inbounds float*, float** [[T3]], i32 [[T2]]
; CHECK-NEXT: [[T4:%.*]] = load float*, float** [[ARRAYIDX109]], align 4
; CHECK-NEXT: [[T5:%.*]] = load float**, float*** @vv, align 4
; CHECK-NEXT: [[ARRAYIDX111:%.*]] = getelementptr inbounds float*, float** [[T5]], i32 [[T2]]
; CHECK-NEXT: [[T6:%.*]] = load float*, float** [[ARRAYIDX111]], align 4
; CHECK-NEXT: [[T7:%.*]] = load float*, float** @ll, align 4
; CHECK-NEXT: [[ARRAYIDX113:%.*]] = getelementptr inbounds float, float* [[T7]], i32 [[T2]]
; CHECK-NEXT: [[T8:%.*]] = load float, float* [[ARRAYIDX113]], align 4
; CHECK-NEXT: [[CONV114:%.*]] = fpext float [[T8]] to double
; CHECK-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i32 [[T]], 2
; CHECK-NEXT: br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; CHECK: vector.ph:
; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i32 [[T]], 2
; CHECK-NEXT: [[N_VEC:%.*]] = sub i32 [[T]], [[N_MOD_VF]]
; CHECK-NEXT: [[TMP0:%.*]] = insertelement <2 x double> zeroinitializer, double [[CONV114]], i32 0
; CHECK-NEXT: br label [[VECTOR_BODY:%.*]]
; CHECK: vector.body:
; CHECK-NEXT: [[INDEX:%.*]] = phi i32 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; CHECK-NEXT: [[VEC_PHI:%.*]] = phi <2 x double> [ [[TMP0]], [[VECTOR_PH]] ], [ [[TMP16:%.*]], [[VECTOR_BODY]] ]
; CHECK-NEXT: [[TMP1:%.*]] = add i32 [[INDEX]], 0
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds float, float* [[X:%.*]], i32 [[TMP1]]
; CHECK-NEXT: [[TMP3:%.*]] = getelementptr inbounds float, float* [[TMP2]], i32 0
; CHECK-NEXT: [[TMP4:%.*]] = bitcast float* [[TMP3]] to <2 x float>*
; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <2 x float>, <2 x float>* [[TMP4]], align 4
; CHECK-NEXT: [[TMP5:%.*]] = getelementptr inbounds float, float* [[T4]], i32 [[TMP1]]
; CHECK-NEXT: [[TMP6:%.*]] = getelementptr inbounds float, float* [[TMP5]], i32 0
; CHECK-NEXT: [[TMP7:%.*]] = bitcast float* [[TMP6]] to <2 x float>*
; CHECK-NEXT: [[WIDE_LOAD1:%.*]] = load <2 x float>, <2 x float>* [[TMP7]], align 4
; CHECK-NEXT: [[TMP8:%.*]] = fsub fast <2 x float> [[WIDE_LOAD]], [[WIDE_LOAD1]]
; CHECK-NEXT: [[TMP9:%.*]] = fpext <2 x float> [[TMP8]] to <2 x double>
; CHECK-NEXT: [[TMP10:%.*]] = fmul fast <2 x double> [[TMP9]], [[TMP9]]
; CHECK-NEXT: [[TMP11:%.*]] = getelementptr inbounds float, float* [[T6]], i32 [[TMP1]]
; CHECK-NEXT: [[TMP12:%.*]] = getelementptr inbounds float, float* [[TMP11]], i32 0
; CHECK-NEXT: [[TMP13:%.*]] = bitcast float* [[TMP12]] to <2 x float>*
; CHECK-NEXT: [[WIDE_LOAD2:%.*]] = load <2 x float>, <2 x float>* [[TMP13]], align 4
; CHECK-NEXT: [[TMP14:%.*]] = fpext <2 x float> [[WIDE_LOAD2]] to <2 x double>
; CHECK-NEXT: [[TMP15:%.*]] = fmul fast <2 x double> [[TMP10]], [[TMP14]]
; CHECK-NEXT: [[TMP16]] = fsub fast <2 x double> [[VEC_PHI]], [[TMP15]]
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i32 [[INDEX]], 2
; CHECK-NEXT: [[TMP17:%.*]] = icmp eq i32 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-NEXT: br i1 [[TMP17]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], [[LOOP0:!llvm.loop !.*]]
; CHECK: middle.block:
; CHECK-NEXT: [[TMP18:%.*]] = call fast double @llvm.vector.reduce.fadd.v2f64(double -0.000000e+00, <2 x double> [[TMP16]])
; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i32 [[T]], [[N_VEC]]
; CHECK-NEXT: br i1 [[CMP_N]], label [[OUTEREND]], label [[SCALAR_PH]]
; CHECK: scalar.ph:
; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i32 [ [[N_VEC]], [[MIDDLE_BLOCK]] ], [ 0, [[OUTERLOOP]] ]
; CHECK-NEXT: [[BC_MERGE_RDX:%.*]] = phi double [ [[CONV114]], [[OUTERLOOP]] ], [ [[TMP18]], [[MIDDLE_BLOCK]] ]
; CHECK-NEXT: br label [[INNERLOOP:%.*]]
; CHECK: innerloop:
; CHECK-NEXT: [[I_2132:%.*]] = phi i32 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[INC129:%.*]], [[INNERLOOP]] ]
; CHECK-NEXT: [[DVAL1_4131:%.*]] = phi double [ [[BC_MERGE_RDX]], [[SCALAR_PH]] ], [ [[SUB127:%.*]], [[INNERLOOP]] ]
; CHECK-NEXT: [[ARRAYIDX119:%.*]] = getelementptr inbounds float, float* [[X]], i32 [[I_2132]]
; CHECK-NEXT: [[T9:%.*]] = load float, float* [[ARRAYIDX119]], align 4
; CHECK-NEXT: [[ARRAYIDX120:%.*]] = getelementptr inbounds float, float* [[T4]], i32 [[I_2132]]
; CHECK-NEXT: [[T10:%.*]] = load float, float* [[ARRAYIDX120]], align 4
; CHECK-NEXT: [[SUB121:%.*]] = fsub fast float [[T9]], [[T10]]
; CHECK-NEXT: [[CONV122:%.*]] = fpext float [[SUB121]] to double
; CHECK-NEXT: [[MUL123:%.*]] = fmul fast double [[CONV122]], [[CONV122]]
; CHECK-NEXT: [[ARRAYIDX124:%.*]] = getelementptr inbounds float, float* [[T6]], i32 [[I_2132]]
; CHECK-NEXT: [[T11:%.*]] = load float, float* [[ARRAYIDX124]], align 4
; CHECK-NEXT: [[CONV125:%.*]] = fpext float [[T11]] to double
; CHECK-NEXT: [[MUL126:%.*]] = fmul fast double [[MUL123]], [[CONV125]]
; CHECK-NEXT: [[SUB127]] = fsub fast double [[DVAL1_4131]], [[MUL126]]
; CHECK-NEXT: [[INC129]] = add nuw nsw i32 [[I_2132]], 1
; CHECK-NEXT: [[EXITCOND143:%.*]] = icmp eq i32 [[INC129]], [[T]]
; CHECK-NEXT: br i1 [[EXITCOND143]], label [[OUTEREND]], label [[INNERLOOP]], [[LOOP2:!llvm.loop !.*]]
; CHECK: outerend:
; CHECK-NEXT: [[SUB127_LCSSA:%.*]] = phi double [ [[SUB127]], [[INNERLOOP]] ], [ [[TMP18]], [[MIDDLE_BLOCK]] ]
; CHECK-NEXT: [[CONV138:%.*]] = fptosi double [[SUB127_LCSSA]] to i32
; CHECK-NEXT: [[CALL142]] = add nuw nsw i32 [[SCORE_1135]], [[CONV138]]
; CHECK-NEXT: [[INC144]] = add nuw nsw i32 [[J_0136]], 1
; CHECK-NEXT: [[ARRAYIDX102:%.*]] = getelementptr inbounds i32, i32* @a, i32 [[INC144]]
; CHECK-NEXT: [[V17]] = load i32, i32* [[ARRAYIDX102]], align 4
; CHECK-NEXT: [[CMP103:%.*]] = icmp sgt i32 [[V17]], -1
; CHECK-NEXT: br i1 [[CMP103]], label [[OUTERLOOP]], label [[EXIT:%.*]]
; CHECK: exit:
; CHECK-NEXT: ret i32 [[CALL142]]
;
entry:
%t = load i32, i32* @v, align 8
%t1 = load i32, i32* @a, align 4
br label %outerloop
outerloop:
%t2 = phi i32 [ %v17, %outerend ], [ %t1, %entry ]
%j.0136 = phi i32 [ %inc144, %outerend ], [ 0, %entry ]
%score.1135 = phi i32 [ %call142, %outerend ], [ -939524096, %entry ]
%t3 = load float**, float*** @mm, align 4
%arrayidx109 = getelementptr inbounds float*, float** %t3, i32 %t2
%t4 = load float*, float** %arrayidx109, align 4
%t5 = load float**, float*** @vv, align 4
%arrayidx111 = getelementptr inbounds float*, float** %t5, i32 %t2
%t6 = load float*, float** %arrayidx111, align 4
%t7 = load float*, float** @ll, align 4
%arrayidx113 = getelementptr inbounds float, float* %t7, i32 %t2
%t8 = load float, float* %arrayidx113, align 4
%conv114 = fpext float %t8 to double
br label %innerloop
innerloop:
%i.2132 = phi i32 [ 0, %outerloop ], [ %inc129, %innerloop ]
%dval1.4131 = phi double [ %conv114, %outerloop ], [ %sub127, %innerloop ]
%arrayidx119 = getelementptr inbounds float, float* %x, i32 %i.2132
%t9 = load float, float* %arrayidx119, align 4
%arrayidx120 = getelementptr inbounds float, float* %t4, i32 %i.2132
%t10 = load float, float* %arrayidx120, align 4
%sub121 = fsub fast float %t9, %t10
%conv122 = fpext float %sub121 to double
%mul123 = fmul fast double %conv122, %conv122
%arrayidx124 = getelementptr inbounds float, float* %t6, i32 %i.2132
%t11 = load float, float* %arrayidx124, align 4
%conv125 = fpext float %t11 to double
%mul126 = fmul fast double %mul123, %conv125
%sub127 = fsub fast double %dval1.4131, %mul126
%inc129 = add nuw nsw i32 %i.2132, 1
%exitcond143 = icmp eq i32 %inc129, %t
br i1 %exitcond143, label %outerend, label %innerloop
outerend:
%sub127.lcssa = phi double [ %sub127, %innerloop ]
%conv138 = fptosi double %sub127.lcssa to i32
%call142 = add nuw nsw i32 %score.1135, %conv138
%inc144 = add nuw nsw i32 %j.0136, 1
%arrayidx102 = getelementptr inbounds i32, i32* @a, i32 %inc144
%v17 = load i32, i32* %arrayidx102, align 4
%cmp103 = icmp sgt i32 %v17, -1
br i1 %cmp103, label %outerloop, label %exit
exit:
ret i32 %call142
}
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