derek.holloway
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61 lines
1.9 KiB
LLVM
61 lines
1.9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; Verify that strnlen calls that aren't folded into constants are annotated
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; with noundef, nonnull, and dereferenceable only when maxlen is known to
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; to be nonzero.
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;
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; RUN: opt < %s -passes=instcombine -S | FileCheck %s
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declare i64 @strnlen(ptr, i64)
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@ecp = external global ptr, align 8
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; Annotate strnlen(ecp, 3) call with noundef, nonnull, and dereferenceable
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; based on the access to *ecp.
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define i64 @deref_strnlen_ecp_3() {
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; CHECK-LABEL: @deref_strnlen_ecp_3(
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; CHECK-NEXT: [[PTR:%.*]] = load ptr, ptr @ecp, align 8
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; CHECK-NEXT: [[LEN:%.*]] = call i64 @strnlen(ptr noundef nonnull dereferenceable(1) [[PTR]], i64 3)
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; CHECK-NEXT: ret i64 [[LEN]]
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;
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%ptr = load ptr, ptr @ecp
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%len = call i64 @strnlen(ptr %ptr, i64 3)
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ret i64 %len
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}
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; Annotate strnlen(ecp, %n) call with nonzero %n with noundef, nonnull, and
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; dereferenceable based on the access to *ecp.
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define i64 @deref_strnlen_ecp_nz(i64 %n) {
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; CHECK-LABEL: @deref_strnlen_ecp_nz(
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; CHECK-NEXT: [[NONZERO:%.*]] = or i64 [[N:%.*]], 1
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; CHECK-NEXT: [[PTR:%.*]] = load ptr, ptr @ecp, align 8
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; CHECK-NEXT: [[LEN:%.*]] = call i64 @strnlen(ptr noundef nonnull dereferenceable(1) [[PTR]], i64 [[NONZERO]])
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; CHECK-NEXT: ret i64 [[LEN]]
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;
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%nonzero = or i64 %n, 1
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%ptr = load ptr, ptr @ecp
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%len = call i64 @strnlen(ptr %ptr, i64 %nonzero)
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ret i64 %len
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}
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; Do not annotate strnlen(ecp, %n) call with nonnull etc. because it need
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; not access *ecp. (Strictly, every pointer function argument must be
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; noundef, so this is overly conservative.)
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define i64 @noderef_strnlen_ecp_n(i64 %n) {
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; CHECK-LABEL: @noderef_strnlen_ecp_n(
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; CHECK-NEXT: [[PTR:%.*]] = load ptr, ptr @ecp, align 8
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; CHECK-NEXT: [[LEN:%.*]] = call i64 @strnlen(ptr [[PTR]], i64 [[N:%.*]])
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; CHECK-NEXT: ret i64 [[LEN]]
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;
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%ptr = load ptr, ptr @ecp
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%len = call i64 @strnlen(ptr %ptr, i64 %n)
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ret i64 %len
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}
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