https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124407
--- Comment #5 from Zdenek Sojka <zsojka at seznam dot cz> --- Created attachment 63854 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=63854&action=edit unreduced testcase Thank you for having a look. The original unreduced testcase was ICEing with a different constant: $ x86_64-pc-linux-gnu-gcc -Ofast xxx.c -w -Wno-psabi xxx.c: In function 'main': xxx.c:449:1: error: unrecognizable insn: 449 | } | ^ (insn 4104 1007 4103 17 (set (reg:SF 3605) (const_int 1313486336 [0x4e4a3600])) -1 (nil)) during RTL pass: subreg3 xxx.c:449:1: internal compiler error: in extract_insn, at recog.cc:2892 0x2ca62bd internal_error(char const*, ...) /repo/gcc-trunk/gcc/diagnostic-global-context.cc:787 0xe2e52f fancy_abort(char const*, int, char const*) /repo/gcc-trunk/gcc/diagnostics/context.cc:1813 0x891b76 _fatal_insn(char const*, rtx_def const*, char const*, int, char const*) /repo/gcc-trunk/gcc/rtl-error.cc:108 0x891bf3 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*) /repo/gcc-trunk/gcc/rtl-error.cc:116 0x880667 extract_insn(rtx_insn*) /repo/gcc-trunk/gcc/recog.cc:2892 0x2a797a7 decompose_multiword_subregs /repo/gcc-trunk/gcc/lower-subreg.cc:1584 0x2a7a6ad execute /repo/gcc-trunk/gcc/lower-subreg.cc:1849 /repo/gcc-trunk/binary-trunk-20260309083914-r16-7953-g1ad01d1aa22686-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/16.0.1/cc1 -quiet -iprefix /repo/gcc-trunk/binary-trunk-20260309083914-r16-7953-g1ad01d1aa22686-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../lib/gcc/x86_64-pc-linux-gnu/16.0.1/ xxx.c -quiet -dumpdir a- -dumpbase xxx.c -dumpbase-ext .c -mtune=generic -march=x86-64 -Ofast -Wno-psabi -w -o /tmp/ccUeJ1Pt.s Please submit a full bug report, with preprocessed source (by using -freport-bug). Please include the complete backtrace with any bug report. See <https://gcc.gnu.org/bugs/> for instructions.
