derek.holloway
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40 lines
1.5 KiB
LLVM
40 lines
1.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
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; RUN: opt -passes=loop-unroll -S < %s | FileCheck %s
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; llvm.loop.estimated_trip_count can't actually become a negative value.
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; It must be treated as an unsigned all around.
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; We are testing the overflow case of EstimatedTripCount + AlreadyPeeled
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; e.g AlreadyPeeled == 1 and EstimatedTripCount == -1 (INT_MAX)
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; would overflow the <= MaxPeelCount check and peel for a long time.
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define void @PR173169() !prof !0 {
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; CHECK-LABEL: define void @PR173169(
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; CHECK-SAME: ) !prof [[PROF0:![0-9]+]] {
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; CHECK-NEXT: [[ENTRY:.*:]]
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; CHECK-NEXT: br label %[[LOOP:.*]]
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; CHECK: [[LOOP]]:
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; CHECK-NEXT: br i1 true, label %[[LOOP]], label %[[EXIT:.*]], !llvm.loop [[LOOP1:![0-9]+]]
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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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br label %loop
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loop: ; preds = %loop, %entry
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br i1 true, label %loop, label %exit, !llvm.loop !1
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exit: ; preds = %loop
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ret void
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}
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!0 = !{!"function_entry_count", i64 1000}
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!1 = distinct !{!1, !2, !3}
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!2 = !{!"llvm.loop.peeled.count", i32 1}
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!3 = !{!"llvm.loop.estimated_trip_count", i32 -1}
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;.
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; CHECK: [[PROF0]] = !{!"function_entry_count", i64 1000}
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; CHECK: [[LOOP1]] = distinct !{[[LOOP1]], [[META2:![0-9]+]], [[META3:![0-9]+]]}
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; CHECK: [[META2]] = !{!"llvm.loop.peeled.count", i32 1}
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; CHECK: [[META3]] = !{!"llvm.loop.estimated_trip_count", i32 -1}
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;.
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