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llvm/test/Transforms/LoopVectorize/first-order-recurrence.ll
Ayal Zaks e1f7499ee7 [LV] Test once if vector trip count is zero, instead of twice 
Generate a single test to decide if there are enough iterations to jump to the
vectorized loop, or else go to the scalar remainder loop. This test compares the
Scalar Trip Count: if STC < VF * UF go to the scalar loop. If
requiresScalarEpilogue() holds, at-least one iteration must remain scalar; the
rest can be used to form vector iterations. So in this case the test checks
instead if (STC - 1) < VF * UF by comparing STC <= VF * UF, and going to the
scalar loop if so. Otherwise the vector loop is entered for at-least one vector
iteration.

This test covers the case where incrementing the backedge-taken count will
overflow leading to an incorrect trip count of zero. In this (rare) case we will
also avoid the vector loop and jump to the scalar loop.

This patch simplifies the existing tests and effectively removes the basic-block
originally named "min.iters.checked", leaving the single test in block
"vector.ph".

Original observation and initial patch by Evgeny Stupachenko.

Differential Revision: https://reviews.llvm.org/D34150


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@308421 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-19 05:16:39 +00:00

530 lines
22 KiB
LLVM
Raw Blame History

; RUN: opt < %s -loop-vectorize -force-vector-width=4 -force-vector-interleave=1 -dce -instcombine -S | FileCheck %s
; RUN: opt < %s -loop-vectorize -force-vector-width=4 -force-vector-interleave=2 -dce -instcombine -S | FileCheck %s --check-prefix=UNROLL
; RUN: opt < %s -loop-vectorize -force-vector-width=4 -force-vector-interleave=2 -S | FileCheck %s --check-prefix=UNROLL-NO-IC
; RUN: opt < %s -loop-vectorize -force-vector-width=1 -force-vector-interleave=2 -S | FileCheck %s --check-prefix=UNROLL-NO-VF
; RUN: opt < %s -loop-vectorize -force-vector-width=4 -force-vector-interleave=1 -S | FileCheck %s --check-prefix=SINK-AFTER
; RUN: opt < %s -loop-vectorize -force-vector-width=4 -force-vector-interleave=1 -S | FileCheck %s --check-prefix=NO-SINK-AFTER
target datalayout = "e-m:e-i64:64-i128:128-n32:64-S128"
; void recurrence_1(int *a, int *b, int n) {
; for(int i = 0; i < n; i++)
; b[i] = a[i] + a[i - 1]
; }
;
; CHECK-LABEL: @recurrence_1(
; CHECK: vector.ph:
; CHECK: %vector.recur.init = insertelement <4 x i32> undef, i32 %pre_load, i32 3
; CHECK: vector.body:
; CHECK: %vector.recur = phi <4 x i32> [ %vector.recur.init, %vector.ph ], [ [[L1:%[a-zA-Z0-9.]+]], %vector.body ]
; CHECK: [[L1]] = load <4 x i32>
; CHECK: {{.*}} = shufflevector <4 x i32> %vector.recur, <4 x i32> [[L1]], <4 x i32> <i32 3, i32 4, i32 5, i32 6>
; CHECK: middle.block:
; CHECK: %vector.recur.extract = extractelement <4 x i32> [[L1]], i32 3
; CHECK: scalar.ph:
; CHECK: %scalar.recur.init = phi i32 [ %vector.recur.extract, %middle.block ], [ %pre_load, %vector.memcheck ], [ %pre_load, %for.preheader ]
; CHECK: scalar.body:
; CHECK: %scalar.recur = phi i32 [ %scalar.recur.init, %scalar.ph ], [ {{.*}}, %scalar.body ]
;
; UNROLL-LABEL: @recurrence_1(
; UNROLL: vector.body:
; UNROLL: %vector.recur = phi <4 x i32> [ %vector.recur.init, %vector.ph ], [ [[L2:%[a-zA-Z0-9.]+]], %vector.body ]
; UNROLL: [[L1:%[a-zA-Z0-9.]+]] = load <4 x i32>
; UNROLL: [[L2]] = load <4 x i32>
; UNROLL: {{.*}} = shufflevector <4 x i32> %vector.recur, <4 x i32> [[L1]], <4 x i32> <i32 3, i32 4, i32 5, i32 6>
; UNROLL: {{.*}} = shufflevector <4 x i32> [[L1]], <4 x i32> [[L2]], <4 x i32> <i32 3, i32 4, i32 5, i32 6>
; UNROLL: middle.block:
; UNROLL: %vector.recur.extract = extractelement <4 x i32> [[L2]], i32 3
;
define void @recurrence_1(i32* nocapture readonly %a, i32* nocapture %b, i32 %n) {
entry:
br label %for.preheader
for.preheader:
%arrayidx.phi.trans.insert = getelementptr inbounds i32, i32* %a, i64 0
%pre_load = load i32, i32* %arrayidx.phi.trans.insert
br label %scalar.body
scalar.body:
%0 = phi i32 [ %pre_load, %for.preheader ], [ %1, %scalar.body ]
%indvars.iv = phi i64 [ 0, %for.preheader ], [ %indvars.iv.next, %scalar.body ]
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%arrayidx32 = getelementptr inbounds i32, i32* %a, i64 %indvars.iv.next
%1 = load i32, i32* %arrayidx32
%arrayidx34 = getelementptr inbounds i32, i32* %b, i64 %indvars.iv
%add35 = add i32 %1, %0
store i32 %add35, i32* %arrayidx34
%lftr.wideiv = trunc i64 %indvars.iv.next to i32
%exitcond = icmp eq i32 %lftr.wideiv, %n
br i1 %exitcond, label %for.exit, label %scalar.body
for.exit:
ret void
}
; int recurrence_2(int *a, int n) {
; int minmax;
; for (int i = 0; i < n; ++i)
; minmax = min(minmax, max(a[i] - a[i-1], 0));
; return minmax;
; }
;
; CHECK-LABEL: @recurrence_2(
; CHECK: vector.ph:
; CHECK: %vector.recur.init = insertelement <4 x i32> undef, i32 %.pre, i32 3
; CHECK: vector.body:
; CHECK: %vector.recur = phi <4 x i32> [ %vector.recur.init, %vector.ph ], [ [[L1:%[a-zA-Z0-9.]+]], %vector.body ]
; CHECK: [[L1]] = load <4 x i32>
; CHECK: {{.*}} = shufflevector <4 x i32> %vector.recur, <4 x i32> [[L1]], <4 x i32> <i32 3, i32 4, i32 5, i32 6>
; CHECK: middle.block:
; CHECK: %vector.recur.extract = extractelement <4 x i32> [[L1]], i32 3
; CHECK: scalar.ph:
; CHECK: %scalar.recur.init = phi i32 [ %vector.recur.extract, %middle.block ], [ %.pre, %for.preheader ]
; CHECK: scalar.body:
; CHECK: %scalar.recur = phi i32 [ %scalar.recur.init, %scalar.ph ], [ {{.*}}, %scalar.body ]
;
; UNROLL-LABEL: @recurrence_2(
; UNROLL: vector.body:
; UNROLL: %vector.recur = phi <4 x i32> [ %vector.recur.init, %vector.ph ], [ [[L2:%[a-zA-Z0-9.]+]], %vector.body ]
; UNROLL: [[L1:%[a-zA-Z0-9.]+]] = load <4 x i32>
; UNROLL: [[L2]] = load <4 x i32>
; UNROLL: {{.*}} = shufflevector <4 x i32> %vector.recur, <4 x i32> [[L1]], <4 x i32> <i32 3, i32 4, i32 5, i32 6>
; UNROLL: {{.*}} = shufflevector <4 x i32> [[L1]], <4 x i32> [[L2]], <4 x i32> <i32 3, i32 4, i32 5, i32 6>
; UNROLL: middle.block:
; UNROLL: %vector.recur.extract = extractelement <4 x i32> [[L2]], i32 3
;
define i32 @recurrence_2(i32* nocapture readonly %a, i32 %n) {
entry:
%cmp27 = icmp sgt i32 %n, 0
br i1 %cmp27, label %for.preheader, label %for.cond.cleanup
for.preheader:
%arrayidx2.phi.trans.insert = getelementptr inbounds i32, i32* %a, i64 -1
%.pre = load i32, i32* %arrayidx2.phi.trans.insert, align 4
br label %scalar.body
for.cond.cleanup.loopexit:
%minmax.0.cond.lcssa = phi i32 [ %minmax.0.cond, %scalar.body ]
br label %for.cond.cleanup
for.cond.cleanup:
%minmax.0.lcssa = phi i32 [ undef, %entry ], [ %minmax.0.cond.lcssa, %for.cond.cleanup.loopexit ]
ret i32 %minmax.0.lcssa
scalar.body:
%0 = phi i32 [ %.pre, %for.preheader ], [ %1, %scalar.body ]
%indvars.iv = phi i64 [ 0, %for.preheader ], [ %indvars.iv.next, %scalar.body ]
%minmax.028 = phi i32 [ undef, %for.preheader ], [ %minmax.0.cond, %scalar.body ]
%arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
%1 = load i32, i32* %arrayidx, align 4
%sub3 = sub nsw i32 %1, %0
%cmp4 = icmp sgt i32 %sub3, 0
%cond = select i1 %cmp4, i32 %sub3, i32 0
%cmp5 = icmp slt i32 %minmax.028, %cond
%minmax.0.cond = select i1 %cmp5, i32 %minmax.028, i32 %cond
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%lftr.wideiv = trunc i64 %indvars.iv.next to i32
%exitcond = icmp eq i32 %lftr.wideiv, %n
br i1 %exitcond, label %for.cond.cleanup.loopexit, label %scalar.body
}
; void recurrence_3(short *a, double *b, int n, float f, short p) {
; b[0] = (double)a[0] - f * (double)p;
; for (int i = 1; i < n; i++)
; b[i] = (double)a[i] - f * (double)a[i - 1];
; }
;
; CHECK-LABEL: @recurrence_3(
; CHECK: vector.ph:
; CHECK: %vector.recur.init = insertelement <4 x i16> undef, i16 %0, i32 3
; CHECK: vector.body:
; CHECK: %vector.recur = phi <4 x i16> [ %vector.recur.init, %vector.ph ], [ [[L1:%[a-zA-Z0-9.]+]], %vector.body ]
; CHECK: [[L1]] = load <4 x i16>
; CHECK: {{.*}} = shufflevector <4 x i16> %vector.recur, <4 x i16> [[L1]], <4 x i32> <i32 3, i32 4, i32 5, i32 6>
; CHECK: middle.block:
; CHECK: %vector.recur.extract = extractelement <4 x i16> [[L1]], i32 3
; CHECK: scalar.ph:
; CHECK: %scalar.recur.init = phi i16 [ %vector.recur.extract, %middle.block ], [ %0, %vector.memcheck ], [ %0, %for.preheader ]
; CHECK: scalar.body:
; CHECK: %scalar.recur = phi i16 [ %scalar.recur.init, %scalar.ph ], [ {{.*}}, %scalar.body ]
;
; UNROLL-LABEL: @recurrence_3(
; UNROLL: vector.body:
; UNROLL: %vector.recur = phi <4 x i16> [ %vector.recur.init, %vector.ph ], [ [[L2:%[a-zA-Z0-9.]+]], %vector.body ]
; UNROLL: [[L1:%[a-zA-Z0-9.]+]] = load <4 x i16>
; UNROLL: [[L2]] = load <4 x i16>
; UNROLL: {{.*}} = shufflevector <4 x i16> %vector.recur, <4 x i16> [[L1]], <4 x i32> <i32 3, i32 4, i32 5, i32 6>
; UNROLL: {{.*}} = shufflevector <4 x i16> [[L1]], <4 x i16> [[L2]], <4 x i32> <i32 3, i32 4, i32 5, i32 6>
; UNROLL: middle.block:
; UNROLL: %vector.recur.extract = extractelement <4 x i16> [[L2]], i32 3
;
define void @recurrence_3(i16* nocapture readonly %a, double* nocapture %b, i32 %n, float %f, i16 %p) {
entry:
%0 = load i16, i16* %a, align 2
%conv = sitofp i16 %0 to double
%conv1 = fpext float %f to double
%conv2 = sitofp i16 %p to double
%mul = fmul fast double %conv2, %conv1
%sub = fsub fast double %conv, %mul
store double %sub, double* %b, align 8
%cmp25 = icmp sgt i32 %n, 1
br i1 %cmp25, label %for.preheader, label %for.end
for.preheader:
br label %scalar.body
scalar.body:
%1 = phi i16 [ %0, %for.preheader ], [ %2, %scalar.body ]
%advars.iv = phi i64 [ %advars.iv.next, %scalar.body ], [ 1, %for.preheader ]
%arrayidx5 = getelementptr inbounds i16, i16* %a, i64 %advars.iv
%2 = load i16, i16* %arrayidx5, align 2
%conv6 = sitofp i16 %2 to double
%conv11 = sitofp i16 %1 to double
%mul12 = fmul fast double %conv11, %conv1
%sub13 = fsub fast double %conv6, %mul12
%arrayidx15 = getelementptr inbounds double, double* %b, i64 %advars.iv
store double %sub13, double* %arrayidx15, align 8
%advars.iv.next = add nuw nsw i64 %advars.iv, 1
%lftr.wideiv = trunc i64 %advars.iv.next to i32
%exitcond = icmp eq i32 %lftr.wideiv, %n
br i1 %exitcond, label %for.end.loopexit, label %scalar.body
for.end.loopexit:
br label %for.end
for.end:
ret void
}
; void PR26734(short *a, int *b, int *c, int d, short *e) {
; for (; d != 21; d++) {
; *b &= *c;
; *e = *a - 6;
; *c = *e;
; }
; }
;
; CHECK-LABEL: @PR26734(
; CHECK-NOT: vector.ph:
; CHECK: }
;
define void @PR26734(i16* %a, i32* %b, i32* %c, i32 %d, i16* %e) {
entry:
%cmp4 = icmp eq i32 %d, 21
br i1 %cmp4, label %entry.for.end_crit_edge, label %for.body.lr.ph
entry.for.end_crit_edge:
%.pre = load i32, i32* %b, align 4
br label %for.end
for.body.lr.ph:
%0 = load i16, i16* %a, align 2
%sub = add i16 %0, -6
%conv2 = sext i16 %sub to i32
%c.promoted = load i32, i32* %c, align 4
%b.promoted = load i32, i32* %b, align 4
br label %for.body
for.body:
%inc7 = phi i32 [ %d, %for.body.lr.ph ], [ %inc, %for.body ]
%and6 = phi i32 [ %b.promoted, %for.body.lr.ph ], [ %and, %for.body ]
%conv25 = phi i32 [ %c.promoted, %for.body.lr.ph ], [ %conv2, %for.body ]
%and = and i32 %and6, %conv25
%inc = add nsw i32 %inc7, 1
%cmp = icmp eq i32 %inc, 21
br i1 %cmp, label %for.cond.for.end_crit_edge, label %for.body
for.cond.for.end_crit_edge:
%and.lcssa = phi i32 [ %and, %for.body ]
store i32 %conv2, i32* %c, align 4
store i32 %and.lcssa, i32* %b, align 4
store i16 %sub, i16* %e, align 2
br label %for.end
for.end:
ret void
}
; int PR27246() {
; unsigned int e, n;
; for (int i = 1; i < 49; ++i) {
; for (int k = i; k > 1; --k)
; e = k;
; n = e;
; }
; return n;
; }
;
; CHECK-LABEL: @PR27246(
; CHECK-NOT: vector.ph:
; CHECK: }
;
define i32 @PR27246() {
entry:
br label %for.cond1.preheader
for.cond1.preheader:
%i.016 = phi i32 [ 1, %entry ], [ %inc, %for.cond.cleanup3 ]
%e.015 = phi i32 [ undef, %entry ], [ %e.1.lcssa, %for.cond.cleanup3 ]
br label %for.cond1
for.cond.cleanup:
%e.1.lcssa.lcssa = phi i32 [ %e.1.lcssa, %for.cond.cleanup3 ]
ret i32 %e.1.lcssa.lcssa
for.cond1:
%e.1 = phi i32 [ %k.0, %for.cond1 ], [ %e.015, %for.cond1.preheader ]
%k.0 = phi i32 [ %dec, %for.cond1 ], [ %i.016, %for.cond1.preheader ]
%cmp2 = icmp sgt i32 %k.0, 1
%dec = add nsw i32 %k.0, -1
br i1 %cmp2, label %for.cond1, label %for.cond.cleanup3
for.cond.cleanup3:
%e.1.lcssa = phi i32 [ %e.1, %for.cond1 ]
%inc = add nuw nsw i32 %i.016, 1
%exitcond = icmp eq i32 %inc, 49
br i1 %exitcond, label %for.cond.cleanup, label %for.cond1.preheader
}
; UNROLL-NO-IC-LABEL: @PR30183(
; UNROLL-NO-IC: vector.ph:
; UNROLL-NO-IC: [[VECTOR_RECUR_INIT:%.*]] = insertelement <4 x i32> undef, i32 [[PRE_LOAD:%.*]], i32 3
; UNROLL-NO-IC-NEXT: br label %vector.body
; UNROLL-NO-IC: vector.body:
; UNROLL-NO-IC-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %vector.ph ], [ [[INDEX_NEXT:%.*]], %vector.body ]
; UNROLL-NO-IC-NEXT: [[VECTOR_RECUR:%.*]] = phi <4 x i32> [ [[VECTOR_RECUR_INIT]], %vector.ph ], [ [[TMP42:%.*]], %vector.body ]
; UNROLL-NO-IC: [[TMP27:%.*]] = load i32, i32* {{.*}}
; UNROLL-NO-IC-NEXT: [[TMP28:%.*]] = load i32, i32* {{.*}}
; UNROLL-NO-IC-NEXT: [[TMP29:%.*]] = load i32, i32* {{.*}}
; UNROLL-NO-IC-NEXT: [[TMP30:%.*]] = load i32, i32* {{.*}}
; UNROLL-NO-IC-NEXT: [[TMP35:%.*]] = insertelement <4 x i32> undef, i32 [[TMP27]], i32 0
; UNROLL-NO-IC-NEXT: [[TMP36:%.*]] = insertelement <4 x i32> [[TMP35]], i32 [[TMP28]], i32 1
; UNROLL-NO-IC-NEXT: [[TMP37:%.*]] = insertelement <4 x i32> [[TMP36]], i32 [[TMP29]], i32 2
; UNROLL-NO-IC-NEXT: [[TMP38:%.*]] = insertelement <4 x i32> [[TMP37]], i32 [[TMP30]], i32 3
; UNROLL-NO-IC-NEXT: [[TMP31:%.*]] = load i32, i32* {{.*}}
; UNROLL-NO-IC-NEXT: [[TMP32:%.*]] = load i32, i32* {{.*}}
; UNROLL-NO-IC-NEXT: [[TMP33:%.*]] = load i32, i32* {{.*}}
; UNROLL-NO-IC-NEXT: [[TMP34:%.*]] = load i32, i32* {{.*}}
; UNROLL-NO-IC-NEXT: [[TMP39:%.*]] = insertelement <4 x i32> undef, i32 [[TMP31]], i32 0
; UNROLL-NO-IC-NEXT: [[TMP40:%.*]] = insertelement <4 x i32> [[TMP39]], i32 [[TMP32]], i32 1
; UNROLL-NO-IC-NEXT: [[TMP41:%.*]] = insertelement <4 x i32> [[TMP40]], i32 [[TMP33]], i32 2
; UNROLL-NO-IC-NEXT: [[TMP42]] = insertelement <4 x i32> [[TMP41]], i32 [[TMP34]], i32 3
; UNROLL-NO-IC-NEXT: [[TMP43:%.*]] = shufflevector <4 x i32> [[VECTOR_RECUR]], <4 x i32> [[TMP38]], <4 x i32> <i32 3, i32 4, i32 5, i32 6>
; UNROLL-NO-IC-NEXT: [[TMP44:%.*]] = shufflevector <4 x i32> [[TMP38]], <4 x i32> [[TMP42]], <4 x i32> <i32 3, i32 4, i32 5, i32 6>
; UNROLL-NO-IC-NEXT: [[INDEX_NEXT]] = add i64 [[INDEX]], 8
; UNROLL-NO-IC: br i1 {{.*}}, label %middle.block, label %vector.body
;
define void @PR30183(i32 %pre_load, i32* %a, i32* %b, i64 %n) {
entry:
br label %scalar.body
scalar.body:
%i = phi i64 [ 0, %entry ], [ %i.next, %scalar.body ]
%tmp0 = phi i32 [ %pre_load, %entry ], [ %tmp2, %scalar.body ]
%i.next = add nuw nsw i64 %i, 2
%tmp1 = getelementptr inbounds i32, i32* %a, i64 %i.next
%tmp2 = load i32, i32* %tmp1
%cond = icmp eq i64 %i.next,%n
br i1 %cond, label %for.end, label %scalar.body
for.end:
ret void
}
; UNROLL-NO-IC-LABEL: @constant_folded_previous_value(
; UNROLL-NO-IC: vector.body:
; UNROLL-NO-IC: [[VECTOR_RECUR:%.*]] = phi <4 x i64> [ <i64 undef, i64 undef, i64 undef, i64 0>, %vector.ph ], [ <i64 1, i64 1, i64 1, i64 1>, %vector.body ]
; UNROLL-NO-IC-NEXT: [[TMP0:%.*]] = shufflevector <4 x i64> [[VECTOR_RECUR]], <4 x i64> <i64 1, i64 1, i64 1, i64 1>, <4 x i32> <i32 3, i32 4, i32 5, i32 6>
; UNROLL-NO-IC: br i1 {{.*}}, label %middle.block, label %vector.body
;
define void @constant_folded_previous_value() {
entry:
br label %scalar.body
scalar.body:
%i = phi i64 [ 0, %entry ], [ %i.next, %scalar.body ]
%tmp2 = phi i64 [ 0, %entry ], [ %tmp3, %scalar.body ]
%tmp3 = add i64 0, 1
%i.next = add nuw nsw i64 %i, 1
%cond = icmp eq i64 %i.next, undef
br i1 %cond, label %for.end, label %scalar.body
for.end:
ret void
}
; We vectorize this first order recurrence, by generating two
; extracts for the phi `val.phi` - one at the last index and
; another at the second last index. We need these 2 extracts because
; the first order recurrence phi is used outside the loop, so we require the phi
; itself and not its update (addx).
; UNROLL-NO-IC-LABEL: extract_second_last_iteration
; UNROLL-NO-IC: vector.body
; UNROLL-NO-IC: %step.add = add <4 x i32> %vec.ind, <i32 4, i32 4, i32 4, i32 4>
; UNROLL-NO-IC: %[[L1:.+]] = add <4 x i32> %vec.ind, %broadcast.splat
; UNROLL-NO-IC: %[[L2:.+]] = add <4 x i32> %step.add, %broadcast.splat
; UNROLL-NO-IC: %index.next = add i32 %index, 8
; UNROLL-NO-IC: icmp eq i32 %index.next, 96
; UNROLL-NO-IC: middle.block
; UNROLL-NO-IC: icmp eq i32 96, 96
; UNROLL-NO-IC: %vector.recur.extract = extractelement <4 x i32> %[[L2]], i32 3
; UNROLL-NO-IC: %vector.recur.extract.for.phi = extractelement <4 x i32> %[[L2]], i32 2
; UNROLL-NO-IC: for.end
; UNROLL-NO-IC: %val.phi.lcssa = phi i32 [ %scalar.recur, %for.body ], [ %vector.recur.extract.for.phi, %middle.block ]
; Check the case when unrolled but not vectorized.
; UNROLL-NO-VF-LABEL: extract_second_last_iteration
; UNROLL-NO-VF: vector.body:
; UNROLL-NO-VF: %induction = add i32 %index, 0
; UNROLL-NO-VF: %induction1 = add i32 %index, 1
; UNROLL-NO-VF: %[[L1:.+]] = add i32 %induction, %x
; UNROLL-NO-VF: %[[L2:.+]] = add i32 %induction1, %x
; UNROLL-NO-VF: %index.next = add i32 %index, 2
; UNROLL-NO-VF: icmp eq i32 %index.next, 96
; UNROLL-NO-VF: for.end:
; UNROLL-NO-VF: %val.phi.lcssa = phi i32 [ %scalar.recur, %for.body ], [ %[[L1]], %middle.block ]
define i32 @extract_second_last_iteration(i32* %cval, i32 %x) {
entry:
br label %for.body
for.body:
%inc.phi = phi i32 [ 0, %entry ], [ %inc, %for.body ]
%val.phi = phi i32 [ 0, %entry ], [ %addx, %for.body ]
%inc = add i32 %inc.phi, 1
%bc = zext i32 %inc.phi to i64
%addx = add i32 %inc.phi, %x
%cmp = icmp eq i32 %inc.phi, 95
br i1 %cmp, label %for.end, label %for.body
for.end:
ret i32 %val.phi
}
; We vectorize this first order recurrence, with a set of insertelements for
; each unrolled part. Make sure these insertelements are generated in-order,
; because the shuffle of the first order recurrence will be added after the
; insertelement of the last part UF - 1, assuming the latter appears after the
; insertelements of all other parts.
;
; int PR33613(double *b, double j, int d) {
; int a = 0;
; for(int i = 0; i < 10240; i++, b+=25) {
; double f = b[d]; // Scalarize to form insertelements
; if (j * f)
; a++;
; j = f;
; }
; return a;
; }
;
; UNROLL-NO-IC-LABEL: @PR33613(
; UNROLL-NO-IC: vector.body:
; UNROLL-NO-IC: [[VECTOR_RECUR:%.*]] = phi <4 x double>
; UNROLL-NO-IC: shufflevector <4 x double> [[VECTOR_RECUR]], <4 x double> {{.*}}, <4 x i32> <i32 3, i32 4, i32 5, i32 6>
; UNROLL-NO-IC-NEXT: shufflevector <4 x double> {{.*}}, <4 x double> {{.*}}, <4 x i32> <i32 3, i32 4, i32 5, i32 6>
; UNROLL-NO-IC-NOT: insertelement <4 x double>
; UNROLL-NO-IC: middle.block:
;
define i32 @PR33613(double* %b, double %j, i32 %d) {
entry:
%idxprom = sext i32 %d to i64
br label %for.body
for.cond.cleanup:
%a.1.lcssa = phi i32 [ %a.1, %for.body ]
ret i32 %a.1.lcssa
for.body:
%b.addr.012 = phi double* [ %b, %entry ], [ %add.ptr, %for.body ]
%i.011 = phi i32 [ 0, %entry ], [ %inc1, %for.body ]
%a.010 = phi i32 [ 0, %entry ], [ %a.1, %for.body ]
%j.addr.09 = phi double [ %j, %entry ], [ %0, %for.body ]
%arrayidx = getelementptr inbounds double, double* %b.addr.012, i64 %idxprom
%0 = load double, double* %arrayidx, align 8
%mul = fmul double %j.addr.09, %0
%tobool = fcmp une double %mul, 0.000000e+00
%inc = zext i1 %tobool to i32
%a.1 = add nsw i32 %a.010, %inc
%inc1 = add nuw nsw i32 %i.011, 1
%add.ptr = getelementptr inbounds double, double* %b.addr.012, i64 25
%exitcond = icmp eq i32 %inc1, 10240
br i1 %exitcond, label %for.cond.cleanup, label %for.body
}
; void sink_after(short *a, int n, int *b) {
; for(int i = 0; i < n; i++)
; b[i] = (a[i] * a[i + 1]);
; }
;
; SINK-AFTER-LABEL: sink_after
; Check that the sext sank after the load in the vector loop.
; SINK-AFTER: vector.body
; SINK-AFTER: %vector.recur = phi <4 x i16> [ %vector.recur.init, %vector.ph ], [ %wide.load, %vector.body ]
; SINK-AFTER: %wide.load = load <4 x i16>
; SINK-AFTER: %[[VSHUF:.+]] = shufflevector <4 x i16> %vector.recur, <4 x i16> %wide.load, <4 x i32> <i32 3, i32 4, i32 5, i32 6>
; SINK-AFTER: %[[VCONV:.+]] = sext <4 x i16> %[[VSHUF]] to <4 x i32>
; SINK-AFTER: %[[VCONV3:.+]] = sext <4 x i16> %wide.load to <4 x i32>
; SINK-AFTER: mul nsw <4 x i32> %[[VCONV3]], %[[VCONV]]
; Check also that the sext sank after the load in the scalar loop.
; SINK-AFTER: for.body
; SINK-AFTER: %scalar.recur = phi i16 [ %scalar.recur.init, %scalar.ph ], [ %[[LOAD:.+]], %for.body ]
; SINK-AFTER: %[[LOAD]] = load i16, i16* %arrayidx2
; SINK-AFTER: %[[CONV:.+]] = sext i16 %scalar.recur to i32
; SINK-AFTER: %[[CONV3:.+]] = sext i16 %[[LOAD]] to i32
; SINK-AFTER: %mul = mul nsw i32 %[[CONV3]], %[[CONV]]
;
define void @sink_after(i16* %a, i32* %b, i64 %n) {
entry:
%.pre = load i16, i16* %a
br label %for.body
for.body:
%0 = phi i16 [ %.pre, %entry ], [ %1, %for.body ]
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%conv = sext i16 %0 to i32
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%arrayidx2 = getelementptr inbounds i16, i16* %a, i64 %indvars.iv.next
%1 = load i16, i16* %arrayidx2
%conv3 = sext i16 %1 to i32
%mul = mul nsw i32 %conv3, %conv
%arrayidx5 = getelementptr inbounds i32, i32* %b, i64 %indvars.iv
store i32 %mul, i32* %arrayidx5
%exitcond = icmp eq i64 %indvars.iv.next, %n
br i1 %exitcond, label %for.end, label %for.body
for.end:
ret void
}
; void no_sink_after(short *a, int n, int *b) {
; for(int i = 0; i < n; i++)
; b[i] = ((a[i] + 2) * a[i + 1]);
; }
;
; NO-SINK-AFTER-LABEL: no_sink_after
; NO-SINK-AFTER-NOT: vector.ph:
; NO-SINK-AFTER: }
;
define void @no_sink_after(i16* %a, i32* %b, i64 %n) {
entry:
%.pre = load i16, i16* %a
br label %for.body
for.body:
%0 = phi i16 [ %.pre, %entry ], [ %1, %for.body ]
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%conv = sext i16 %0 to i32
%add = add nsw i32 %conv, 2
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%arrayidx2 = getelementptr inbounds i16, i16* %a, i64 %indvars.iv.next
%1 = load i16, i16* %arrayidx2
%conv3 = sext i16 %1 to i32
%mul = mul nsw i32 %add, %conv3
%arrayidx5 = getelementptr inbounds i32, i32* %b, i64 %indvars.iv
store i32 %mul, i32* %arrayidx5
%exitcond = icmp eq i64 %indvars.iv.next, %n
br i1 %exitcond, label %for.end, label %for.body
for.end:
ret void
}
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