e9de32fd15
Track newly-cloned loops coming from unswitching non-trivial invariant conditions, so as to prevent conditions in such cloned blocks from being unswitched again. Fixes: https://github.com/llvm/llvm-project/issues/138509.
50 lines
1.9 KiB
LLVM
50 lines
1.9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
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; RUN: opt -S -passes="loop-mssa(loop-simplifycfg,licm,loop-rotate,simple-loop-unswitch<nontrivial>)" < %s | FileCheck %s
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@a = global i32 0, align 4
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@b = global i32 0, align 4
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@c = global i32 0, align 4
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@d = global i32 0, align 4
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define i32 @main() {
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entry:
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br label %outer.loop.header
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outer.loop.header: ; preds = %outer.loop.latch, %entry
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br i1 false, label %exit, label %outer.loop.body
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outer.loop.body: ; preds = %inner.loop.header, %outer.loop.header
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store i32 1, ptr @c, align 4
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%cmp = icmp sgt i32 0, -1
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br i1 %cmp, label %outer.loop.latch, label %exit
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inner.loop.header: ; preds = %outer.loop.latch, %inner.loop.body
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%a_val = load i32, ptr @a, align 4
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%c_val = load i32, ptr @c, align 4
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%mul = mul nsw i32 %c_val, %a_val
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store i32 %mul, ptr @b, align 4
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%cmp2 = icmp sgt i32 %mul, -1
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br i1 %cmp2, label %inner.loop.body, label %outer.loop.body
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inner.loop.body: ; preds = %inner.loop.header
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%mul2 = mul nsw i32 %c_val, 3
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store i32 %mul2, ptr @c, align 4
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store i32 %c_val, ptr @d, align 4
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%mul3 = mul nsw i32 %c_val, %a_val
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%cmp3 = icmp sgt i32 %mul3, -1
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br i1 %cmp3, label %inner.loop.header, label %exit
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outer.loop.latch: ; preds = %outer.loop.body
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%d_val = load i32, ptr @d, align 4
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store i32 %d_val, ptr @b, align 4
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%cmp4 = icmp eq i32 %d_val, 0
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br i1 %cmp4, label %inner.loop.header, label %outer.loop.header
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exit: ; preds = %inner.loop.body, %outer.loop.body, %outer.loop.header
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ret i32 0
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}
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; CHECK: [[LOOP0:.*]] = distinct !{[[LOOP0]], [[META1:![0-9]+]]}
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; CHECK: [[META1]] = !{!"llvm.loop.unswitch.nontrivial.disable"}
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; CHECK: [[LOOP2:.*]] = distinct !{[[LOOP2]], [[META1]]}
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