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7dbb3087e2
Summary: canUnrollCompletely takes `unsigned` values for `UnrolledCost` and `RolledDynamicCost` but is passed in `uint64_t`s that are silently truncated. Because of this, when `UnrolledSize` is a large integer that has a small remainder with UINT32_MAX, LLVM tries to completely unroll loops with high trip counts. Reviewers: mzolotukhin, chandlerc Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D10293 llvm-svn: 239218
59 lines
1.3 KiB
LLVM
59 lines
1.3 KiB
LLVM
; RUN: opt -S -loop-unroll < %s | FileCheck %s
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; LLVM should not try to fully unroll this loop.
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declare void @f()
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declare void @g()
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declare void @h()
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define void @trivial_loop() {
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; CHECK-LABEL: @trivial_loop(
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entry:
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br label %loop
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loop:
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%idx = phi i32 [ 0, %entry ], [ %idx.inc, %loop ]
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%idx.inc = add i32 %idx, 1
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call void @f()
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call void @g()
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call void @h()
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call void @f()
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call void @g()
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call void @h()
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call void @f()
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call void @g()
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call void @h()
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call void @f()
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call void @g()
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call void @h()
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call void @f()
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call void @g()
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call void @h()
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%be = icmp slt i32 %idx, 268435456
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br i1 %be, label %loop, label %exit
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; CHECK: loop:
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; CHECK-NEXT: %idx = phi i32 [ 0, %entry ], [ %idx.inc, %loop ]
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; CHECK-NEXT: %idx.inc = add i32 %idx, 1
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; CHECK-NEXT: call void @f()
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; CHECK-NEXT: call void @g()
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; CHECK-NEXT: call void @h()
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; CHECK-NEXT: call void @f()
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; CHECK-NEXT: call void @g()
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; CHECK-NEXT: call void @h()
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; CHECK-NEXT: call void @f()
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; CHECK-NEXT: call void @g()
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; CHECK-NEXT: call void @h()
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; CHECK-NEXT: call void @f()
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; CHECK-NEXT: call void @g()
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; CHECK-NEXT: call void @h()
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; CHECK-NEXT: call void @f()
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; CHECK-NEXT: call void @g()
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; CHECK-NEXT: call void @h()
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; CHECK-NEXT: %be = icmp slt i32 %idx, 268435456
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; CHECK-NEXT: br i1 %be, label %loop, label %exit
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exit:
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ret void
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}
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