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150
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1 ; RUN: opt < %s -S -debug-only=loop-unroll -loop-unroll 2>&1 | FileCheck %s
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2 ; RUN: opt < %s -S -debug-only=loop-unroll -passes='require<profile-summary>,function(require<opt-remark-emit>,unroll)' 2>&1 | FileCheck %s
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3 ; Confirm that peeling is disabled if the number of counts required to reach
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4 ; the hot percentile is above the threshold.
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5 ; RUN: opt < %s -S -profile-summary-huge-working-set-size-threshold=9 -debug-only=loop-unroll -passes='require<profile-summary>,function(require<opt-remark-emit>,unroll)' 2>&1 | FileCheck %s --check-prefix=NOPEEL
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6 ; REQUIRES: asserts
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7
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8 ; Make sure we use the profile information correctly to peel-off 3 iterations
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9 ; from the loop, and update the branch weights for the peeled loop properly.
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10
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11 ; CHECK: Loop Unroll: F[basic]
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12 ; CHECK: PEELING loop %for.body with iteration count 4!
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13 ; CHECK: Loop Unroll: F[optsize]
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14 ; CHECK-NOT: PEELING
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15
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16 ; Confirm that no peeling occurs when we are performing full unrolling.
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17 ; RUN: opt < %s -S -debug-only=loop-unroll -passes='require<opt-remark-emit>,loop(unroll-full)' 2>&1 | FileCheck %s --check-prefix=NOPEEL
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18 ; NOPEEL-NOT: PEELING
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19
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20 ; CHECK-LABEL: @basic
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21 ; CHECK: br i1 %{{.*}}, label %[[NEXT0:.*]], label %for.cond.for.end_crit_edge, !prof !15
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22 ; CHECK: [[NEXT0]]:
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23 ; CHECK: br i1 %{{.*}}, label %[[NEXT1:.*]], label %for.cond.for.end_crit_edge, !prof !16
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24 ; CHECK: [[NEXT1]]:
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25 ; CHECK: br i1 %{{.*}}, label %[[NEXT2:.*]], label %for.cond.for.end_crit_edge, !prof !17
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26 ; CHECK: [[NEXT2]]:
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27 ; CHECK: br i1 %{{.*}}, label %for.body, label %{{.*}}, !prof !18
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28
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29 define void @basic(i32* %p, i32 %k) #0 !prof !15 {
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30 entry:
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31 %cmp3 = icmp slt i32 0, %k
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32 br i1 %cmp3, label %for.body.lr.ph, label %for.end
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33
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34 for.body.lr.ph: ; preds = %entry
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35 br label %for.body
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36
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37 for.body: ; preds = %for.body.lr.ph, %for.body
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38 %i.05 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
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39 %p.addr.04 = phi i32* [ %p, %for.body.lr.ph ], [ %incdec.ptr, %for.body ]
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40 %incdec.ptr = getelementptr inbounds i32, i32* %p.addr.04, i32 1
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41 store i32 %i.05, i32* %p.addr.04, align 4
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42 %inc = add nsw i32 %i.05, 1
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43 %cmp = icmp slt i32 %inc, %k
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44 br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge, !prof !16
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45
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46 for.cond.for.end_crit_edge: ; preds = %for.body
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47 br label %for.end
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48
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49 for.end: ; preds = %for.cond.for.end_crit_edge, %entry
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50 ret void
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51 }
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52
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53 ; We don't want to peel loops when optimizing for size.
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54 ; CHECK-LABEL: @optsize
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55 ; CHECK: for.body.lr.ph:
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56 ; CHECK-NEXT: br label %for.body
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57 ; CHECK: for.body:
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58 ; CHECK-NOT: br
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59 ; CHECK: br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge
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60 define void @optsize(i32* %p, i32 %k) #1 !prof !15 {
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61 entry:
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62 %cmp3 = icmp slt i32 0, %k
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63 br i1 %cmp3, label %for.body.lr.ph, label %for.end
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64
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65 for.body.lr.ph: ; preds = %entry
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66 br label %for.body
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67
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68 for.body: ; preds = %for.body.lr.ph, %for.body
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69 %i.05 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
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70 %p.addr.04 = phi i32* [ %p, %for.body.lr.ph ], [ %incdec.ptr, %for.body ]
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71 %incdec.ptr = getelementptr inbounds i32, i32* %p.addr.04, i32 1
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72 store i32 %i.05, i32* %p.addr.04, align 4
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73 %inc = add nsw i32 %i.05, 1
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74 %cmp = icmp slt i32 %inc, %k
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75 br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge, !prof !16
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76
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77 for.cond.for.end_crit_edge: ; preds = %for.body
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78 br label %for.end
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79
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80 for.end: ; preds = %for.cond.for.end_crit_edge, %entry
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81 ret void
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82 }
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83
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84 attributes #0 = { nounwind }
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85 attributes #1 = { nounwind optsize }
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86
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87 !llvm.module.flags = !{!1}
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88
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89 !1 = !{i32 1, !"ProfileSummary", !2}
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90 !2 = !{!3, !4, !5, !6, !7, !8, !9, !10}
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91 !3 = !{!"ProfileFormat", !"InstrProf"}
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92 !4 = !{!"TotalCount", i64 10}
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93 !5 = !{!"MaxCount", i64 3}
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94 !6 = !{!"MaxInternalCount", i64 1}
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95 !7 = !{!"MaxFunctionCount", i64 3}
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96 !8 = !{!"NumCounts", i64 2}
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97 !9 = !{!"NumFunctions", i64 2}
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98 !10 = !{!"DetailedSummary", !11}
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99 !11 = !{!12, !13, !14}
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100 !12 = !{i32 10000, i64 3, i32 2}
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101 !13 = !{i32 999000, i64 1, i32 10}
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102 !14 = !{i32 999999, i64 1, i32 10}
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103 !15 = !{!"function_entry_count", i64 1}
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104 !16 = !{!"branch_weights", i32 3001, i32 1001}
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105
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106 ;CHECK: !15 = !{!"branch_weights", i32 3001, i32 1001}
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107 ;CHECK: !16 = !{!"branch_weights", i32 2000, i32 1001}
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108 ;CHECK: !17 = !{!"branch_weights", i32 999, i32 1001}
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109 ;CHECK: !18 = !{!"branch_weights", i32 1, i32 1001}
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110
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