https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90497
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> --- spawn -ignore SIGHUP /home/jakub/src/gcc/obj45/gcc/xgcc -B/home/jakub/src/gcc/obj45/gcc/ -fno-diagnostics-show-caret -fno-diagnostics-show-line-numbers -fdiagnostics-color=never -O2 -Werror-implicit-function-declaration -m3dnow -c -o 3dnow-1.o /home/jakub/src/gcc/gcc/testsuite/gcc.target/i386/3dnow-1.c In file included from /home/jakub/src/gcc/gcc/testsuite/gcc.target/i386/3dnow-1.c:14: /home/jakub/src/gcc/obj45/gcc/include/mm3dnow.h: In function '_m_pavgusb': /home/jakub/src/gcc/obj45/gcc/include/mm3dnow.h:53:1: error: unrecognizable insn: (insn 7 4 8 2 (set (reg:V8QI 88) (truncate:V8QI (lshiftrt:V8HI (plus:V8HI (plus:V8HI (zero_extend:V8HI (subreg:V8QI (reg/v:V2SI 86 [ __A ]) 0)) (zero_extend:V8HI (subreg:V8QI (reg/v:V2SI 87 [ __B ]) 0))) (const_vector:V8HI [ (const_int 1 [0x1]) repeated x8 ])) (const_int 1 [0x1])))) "/home/jakub/src/gcc/obj45/gcc/include/mm3dnow.h":52:17 -1 (nil)) during RTL pass: vregs /home/jakub/src/gcc/obj45/gcc/include/mm3dnow.h:53:1: internal compiler error: in extract_insn, at recog.c:2310 0x82dac28 _fatal_insn(char const*, rtx_def const*, char const*, int, char const*) ../../gcc/rtl-error.c:108 0x82daca5 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*) ../../gcc/rtl-error.c:116 0x82cb6d5 extract_insn(rtx_insn*) ../../gcc/recog.c:2310 0x8848ebd instantiate_virtual_regs_in_insn ../../gcc/function.c:1605 0x8848ebd instantiate_virtual_regs ../../gcc/function.c:1975 0x8848ebd execute ../../gcc/function.c:2024 Please submit a full bug report, with preprocessed source if appropriate. Please include the complete backtrace with any bug report. See <https://gcc.gnu.org/bugs/> for instructions. compiler exited with status 1 FAIL: gcc.target/i386/3dnow-1.c (internal compiler error) FAIL: gcc.target/i386/3dnow-1.c (test for excess errors)