craig.topper added a comment. In D156821#4600550 <https://reviews.llvm.org/D156821#4600550>, @MaskRay wrote:
>> Currenly both Clang and GCC support the following set of flags that control > > code gen of signed overflow: > >> [...] >> Howerver, clang ignores these flags for __builtin_abs(int) and its >> higher-width > > versions, so passing minimum integer value always causes poison. > > This paragraph reads as if GCC emits a trap for `__builtin_abs` in -ftrapv > mode, but it doesn't. That said, its `-fsanitize=signed-integer-overflow` > does handle `__builtin_abs`. On X86 at least, gcc does call `__negvsi2` for __builtin_abs under -ftrapv. https://godbolt.org/z/8dhn9bsv5 CHANGES SINCE LAST ACTION https://reviews.llvm.org/D156821/new/ https://reviews.llvm.org/D156821 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
