66 lines
1.9 KiB
LLVM
66 lines
1.9 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -S -passes=loop-unroll -mtriple aarch64 | FileCheck %s
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; Below loop's trip count is not constant and it blocks to unroll the loop.
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; After setting up `UP.UpperBound = true` in `getUnrollingPreferences`,
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; the loop should be unrolled.
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define void @test(i1 %cond) {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[FOR_BODY:%.*]]
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; CHECK: for.body:
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; CHECK-NEXT: switch i32 0, label [[SW_DEFAULT:%.*]] [
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; CHECK-NEXT: i32 2, label [[LATCH:%.*]]
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; CHECK-NEXT: ]
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; CHECK: sw.default:
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; CHECK-NEXT: tail call void @foo()
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; CHECK-NEXT: br label [[LATCH]]
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; CHECK: latch:
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; CHECK-NEXT: br i1 false, label [[FOR_END:%.*]], label [[FOR_BODY_1:%.*]]
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; CHECK: for.body.1:
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; CHECK-NEXT: switch i32 1, label [[SW_DEFAULT_1:%.*]] [
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; CHECK-NEXT: i32 2, label [[LATCH_1:%.*]]
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; CHECK-NEXT: ]
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; CHECK: sw.default.1:
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; CHECK-NEXT: tail call void @foo()
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; CHECK-NEXT: br label [[LATCH_1]]
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; CHECK: latch.1:
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; CHECK-NEXT: br i1 [[COND:%.*]], label [[FOR_END]], label [[FOR_BODY_2:%.*]]
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; CHECK: for.body.2:
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; CHECK-NEXT: switch i32 2, label [[SW_DEFAULT_2:%.*]] [
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; CHECK-NEXT: i32 2, label [[LATCH_2:%.*]]
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; CHECK-NEXT: ]
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; CHECK: sw.default.2:
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; CHECK-NEXT: tail call void @foo()
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; CHECK-NEXT: br label [[LATCH_2]]
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; CHECK: latch.2:
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; CHECK-NEXT: br label [[FOR_END]]
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; CHECK: for.end:
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; CHECK-NEXT: ret void
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;
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entry:
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%0 = select i1 %cond, i32 2, i32 3
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br label %for.body
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for.body:
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%i.017 = phi i32 [ 0, %entry ], [ %inc, %latch ]
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switch i32 %i.017, label %sw.default [
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i32 2, label %latch
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]
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sw.default:
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tail call void @foo()
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br label %latch
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latch:
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%inc = add nuw nsw i32 %i.017, 1
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%exitcond.not = icmp eq i32 %inc, %0
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br i1 %exitcond.not, label %for.end, label %for.body
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for.end:
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ret void
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}
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declare void @foo()
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