forked from OSchip/llvm-project
47 lines
1.5 KiB
LLVM
47 lines
1.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -loop-unroll -unroll-runtime -unroll-runtime-multi-exit < %s | FileCheck %s
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; This loop has a known trip count on the non-latch exit. When performing
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; runtime unrolling (at least when using a prologue rather than epilogue) we
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; should not fold that exit based on known trip count information prior to
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; prologue insertion, as that may change the trip count for the modified loop.
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define void @test(i32 %s, i32 %n) {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[N2:%.*]] = add i32 [[S:%.*]], 123
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[S]], [[ENTRY:%.*]] ], [ [[I_INC:%.*]], [[LATCH:%.*]] ]
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; CHECK-NEXT: [[C1:%.*]] = icmp eq i32 [[I]], [[N2]]
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; CHECK-NEXT: br i1 [[C1]], label [[EXIT1:%.*]], label [[LATCH]]
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; CHECK: latch:
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; CHECK-NEXT: [[C2:%.*]] = icmp eq i32 [[I]], [[N:%.*]]
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; CHECK-NEXT: [[I_INC]] = add i32 [[I]], 1
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; CHECK-NEXT: br i1 [[C2]], label [[EXIT2:%.*]], label [[LOOP]]
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; CHECK: exit1:
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; CHECK-NEXT: ret void
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; CHECK: exit2:
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; CHECK-NEXT: ret void
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;
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entry:
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%n2 = add i32 %s, 123
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br label %loop
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loop:
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%i = phi i32 [ %s, %entry], [ %i.inc, %latch ]
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%c1 = icmp eq i32 %i, %n2
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br i1 %c1, label %exit1, label %latch
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latch:
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%c2 = icmp eq i32 %i, %n
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%i.inc = add i32 %i, 1
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br i1 %c2, label %exit2, label %loop
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exit1:
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ret void
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exit2:
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ret void
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}
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