derek.holloway
7502bf64a4
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52 lines
1.8 KiB
LLVM
52 lines
1.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
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; RUN: opt -passes=indvars -S < %s | FileCheck %s
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define void @infer_via_ranges(ptr %arr, i32 %n) {
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; CHECK-LABEL: define void @infer_via_ranges(
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; CHECK-SAME: ptr [[ARR:%.*]], i32 [[N:%.*]]) {
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; CHECK-NEXT: [[ENTRY:.*:]]
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; CHECK-NEXT: [[FIRST_ITR_CHECK:%.*]] = icmp sgt i32 [[N]], 0
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; CHECK-NEXT: [[START:%.*]] = sub i32 [[N]], 1
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; CHECK-NEXT: br i1 [[FIRST_ITR_CHECK]], label %[[LOOP_PREHEADER:.*]], label %[[EXIT:.*]]
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; CHECK: [[LOOP_PREHEADER]]:
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; CHECK-NEXT: br label %[[LOOP:.*]]
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; CHECK: [[LOOP]]:
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; CHECK-NEXT: [[IDX:%.*]] = phi i32 [ [[IDX_DEC:%.*]], %[[IN_BOUNDS:.*]] ], [ [[START]], %[[LOOP_PREHEADER]] ]
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; CHECK-NEXT: [[IDX_DEC]] = sub nsw i32 [[IDX]], 1
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; CHECK-NEXT: br i1 true, label %[[IN_BOUNDS]], label %[[OUT_OF_BOUNDS:.*]]
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; CHECK: [[IN_BOUNDS]]:
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; CHECK-NEXT: [[ADDR:%.*]] = getelementptr i32, ptr [[ARR]], i32 [[IDX]]
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; CHECK-NEXT: store i32 0, ptr [[ADDR]], align 4
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; CHECK-NEXT: [[NEXT:%.*]] = icmp sgt i32 [[IDX_DEC]], -1
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; CHECK-NEXT: br i1 [[NEXT]], label %[[LOOP]], label %[[EXIT_LOOPEXIT:.*]]
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; CHECK: [[OUT_OF_BOUNDS]]:
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; CHECK-NEXT: ret void
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; CHECK: [[EXIT_LOOPEXIT]]:
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; CHECK-NEXT: br label %[[EXIT]]
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; CHECK: [[EXIT]]:
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; CHECK-NEXT: ret void
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;
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entry:
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%first.itr.check = icmp sgt i32 %n, 0
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%start = sub i32 %n, 1
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br i1 %first.itr.check, label %loop, label %exit
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loop:
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%idx = phi i32 [ %start, %entry ] , [ %idx.dec, %in.bounds ]
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%idx.dec = sub i32 %idx, 1
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%abc = icmp sge i32 %idx, 0
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br i1 %abc, label %in.bounds, label %out.of.bounds
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in.bounds:
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%addr = getelementptr i32, ptr %arr, i32 %idx
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store i32 0, ptr %addr
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%next = icmp sgt i32 %idx.dec, -1
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br i1 %next, label %loop, label %exit
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out.of.bounds:
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ret void
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exit:
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ret void
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}
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