99ddd77ed9
Fixes [PR77842](https://github.com/llvm/llvm-project/issues/77842) where UBSAN causes pragma full unroll to try and unroll INT_MAX times. This sets a cap to make sure we don't attempt this and crash the compiler. Testing: ninja check-all with new test --------- Co-authored-by: Nikita Popov <github@npopov.com>
55 lines
1.8 KiB
LLVM
55 lines
1.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
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; RUN: opt -passes=loop-unroll-full -S %s | FileCheck %s
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; Validate that loop unroll full doesn't try to fully unroll values whose trip counts are too large.
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define void @foo(i64 %end) {
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; CHECK-LABEL: define void @foo(
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; CHECK-SAME: i64 [[END:%.*]]) {
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[LOOPHEADER:%.*]]
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; CHECK: loopheader:
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; CHECK-NEXT: [[IV:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ], [ [[IV_NEW:%.*]], [[BACKEDGE:%.*]] ]
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; CHECK-NEXT: [[EXIT:%.*]] = icmp eq i64 [[IV]], [[END]]
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; CHECK-NEXT: br i1 [[EXIT]], label [[FOR_COND_CLEANUP_LOOPEXIT:%.*]], label [[CONT23:%.*]]
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; CHECK: for.cond.cleanup.loopexit:
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; CHECK-NEXT: ret void
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; CHECK: cont23:
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; CHECK-NEXT: [[EXITCOND241:%.*]] = icmp eq i64 [[IV]], 2147483647
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; CHECK-NEXT: br i1 [[EXITCOND241]], label [[HANDLER_ADD_OVERFLOW:%.*]], label [[BACKEDGE]]
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; CHECK: handler.add_overflow:
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; CHECK-NEXT: unreachable
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; CHECK: backedge:
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; CHECK-NEXT: [[IV_NEW]] = add i64 [[IV]], 1
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; CHECK-NEXT: br label [[LOOPHEADER]], !llvm.loop [[LOOP0:![0-9]+]]
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;
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entry:
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br label %loopheader
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loopheader:
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%iv = phi i64 [ 0, %entry ], [ %iv_new, %backedge ]
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%exit = icmp eq i64 %iv, %end
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br i1 %exit, label %for.cond.cleanup.loopexit, label %cont23
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for.cond.cleanup.loopexit:
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ret void
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cont23:
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%exitcond241 = icmp eq i64 %iv, 2147483647
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br i1 %exitcond241, label %handler.add_overflow, label %backedge
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handler.add_overflow:
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unreachable
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backedge: ; preds = %cont23
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%iv_new = add i64 %iv, 1
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br label %loopheader, !llvm.loop !0
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}
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!0 = distinct !{!0, !1}
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!1 = !{!"llvm.loop.unroll.full"}
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;.
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; CHECK: [[LOOP0]] = distinct !{[[LOOP0]], [[META1:![0-9]+]]}
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; CHECK: [[META1]] = !{!"llvm.loop.unroll.full"}
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;.
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