Hi Everyone, I've got some self tests failing on PowerPC with GCC 8.2. The program was compiled with -O1 and -fsanitize=undefined. The program uses Altivec. A sample finding is shown below.
ppc_simd.h:965 is a vec_add, and it happens on a unsigned int vector. We don't use signed vector types. I don't believe overflow can happen and the algorithm depends on unsigned wrap. I'm only finding two hits on search [1] and neither are a GCC bug report. The code is clean using Clang 7.0 and sanitizers. Any ideas what might be going on? Jeff [1] https://www.google.com/search?q=GCC+ubsan+"vec_add"++"runtime+error%3A+signed+integer+overflow"; $ ./cryptest.exe tv speck ... Testing SymmetricCipher algorithm SPECK-64/ECB. ppc_simd.h:965:38: runtime error: signed integer overflow: 544497990 + 1936613733 cannot be represented in type 'int' ppc_simd.h:982:38: runtime error: signed integer overflow: 2066890867 - -184737755 cannot be represented in type 'int' ... Test FAILED. incorrectly decrypted: 43F7B0E539C4CA8A6D54A9... ... _______________________________________________ cfarm-users mailing list cfarm-users@lists.tetaneutral.net https://lists.tetaneutral.net/listinfo/cfarm-users
