https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61249
--- Comment #1 from Uroš Bizjak <ubizjak at gmail dot com> --- (In reply to Michael Tautschnig from comment #0) > Looking at https://gcc.gnu.org/onlinedocs/gcc/X86-Built-in-Functions.html on > the one hand and AMD's "AMD64 Architecture Programmer’s Manual > Volume 6: 128-Bit and 256-Bit XOP and FMA4 Instructions" on the other hand, > vfrczss/vfrczsd require a second argument to specify the destination. > > Yet r205495 changed _mm_frcz_ss/_mm_frcz_sd so that only a single argument > is passed to the __builtin_ia32_vfrczss/vfrczsd calls. You should not use __builtin_* function directly. They are internal implementation details, published interface is in relevant *.h files. > This was detected at language level (inconsistent types), I can only > speculate that this may cause invalid code to be generated (or null > operands). Did you see the runtime tests in the referred commit?
