On 23/02/2026 4:02 pm, Jan Beulich wrote: > On 23.02.2026 11:04, Edwin Török wrote: >> clang-21's built-in assembler is enabled by default, but it doesn't >> support some mnemonics: >> ``` >> test_x86_emulator.c:2636:36: error: invalid instruction mnemonic 'fsaves' >> 2636 | "fidivs %1\n\t" >> test_x86_emulator.c:2640:24: error: invalid instruction mnemonic 'frstors' >> 2640 | asm volatile ( "frstors %0" :: "m" (res[25]) : "memory" ); >> | ^ >> test_x86_emulator.c:4251:24: error: invalid instruction mnemonic >> 'vpcmpestriq' >> 4251 | put_insn(vpcmpestri, >> | ^ >> ``` > Was this reported to them as a bug (or perhaps even two)?
Looking at just one of these, the mnemonic is FRSTOR without an S, and Clang 21 is happy with that. What is the trailing S supposed to signify to GAS? ~Andrew
