https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120019
--- Comment #2 from Uroš Bizjak <ubizjak at gmail dot com> --- (In reply to Rainer Orth from comment #0) > Between 20250428 and 20250429, Solaris/x86 bootstrap with the native as got > broken compiling libgcc: > > /var/gcc/regression/master/11.4-gcc/build/./gcc/xgcc > -B/var/gcc/regression/master/11.4-gcc/build/./gcc/ > -B/vol/gcc/i386-pc-solaris2.11/bin/ > -B/vol/gcc/i386-pc-solaris2.11/lib/amd64/ -isystem > /vol/gcc/i386-pc-solaris2.11/include -isystem > /vol/gcc/i386-pc-solaris2.11/sys-include -fno-checking -g -O2 -m64 -O2 -g > -O2 -DIN_GCC -W -Wall -Wno-error=narrowing -Wwrite-strings -Wcast-qual > -Wno-format -Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition > -isystem ./include -fpic -g -DIN_LIBGCC2 -fbuilding-libgcc > -fno-stack-protector -fpic -I. -I. -I../../.././gcc > -I/vol/gcc/src/hg/master/local/libgcc > -I/vol/gcc/src/hg/master/local/libgcc/. > -I/vol/gcc/src/hg/master/local/libgcc/../gcc > -I/vol/gcc/src/hg/master/local/libgcc/../include -DHAVE_CC_TLS -o > unwind-dw2.o -MT unwind-dw2.o -MD -MP -MF unwind-dw2.dep -fexceptions -c > /vol/gcc/src/hg/master/local/libgcc/unwind-dw2.c -fvisibility=hidden > -DHIDE_EXPORTS > > Assembler: unwind-dw2.c > "/var/tmp//ccaYKMya.s", line 210 : Invalid instruction argument > Near line: " rep movsq (%rsi), (%rdi)" > "/var/tmp//ccaYKMya.s", line 11414 : Invalid instruction argument > Near line: " rep movsl (%rsi), (%rdi)" > > and similarly for the 32-bit libgcc. > > While as can deal with the previous syntax (rep movsl), it apparently doesn't > grok the new form. > > Bootstrap is fine when using gas, though. Please detect support during configure time and create an operand modifier that will output "gs " or "fs " for non-default address spaces. Then output e.g. "%^%x1rep movsq" for "gs rep movsq" when assembler doesn't support new form.
