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When compiling compiler-rt with -fsanitize=undefined and running testcases you end up with the following warning: UBSan: int_mulo_impl.inc:21:36: left shift of 1 by 63 places cannot be represented in type 'di_int' (aka 'long long') This can be avoided by simply doing the shift in a matching unsigned variant of the type. The same kind of pattern seems to exist in int_mulv_impl.inc This was found in an out of tree target. Reviewed By: MaskRay Differential Revision: https://reviews.llvm.org/D145556
24 lines
779 B
C
24 lines
779 B
C
//===-- mulodi4.c - Implement __mulodi4 -----------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements __mulodi4 for the compiler_rt library.
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//
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//===----------------------------------------------------------------------===//
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#define fixint_t di_int
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#define fixuint_t du_int
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#include "int_mulo_impl.inc"
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// Returns: a * b
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// Effects: sets *overflow to 1 if a * b overflows
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COMPILER_RT_ABI di_int __mulodi4(di_int a, di_int b, int *overflow) {
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return __muloXi4(a, b, overflow);
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}
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