https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88418
Bug ID: 88418 Summary: [7/8/9 Regression] ICE in extract_insn, at recog.c:2305 (error: unrecognizable insn) Product: gcc Version: 7.0 Status: UNCONFIRMED Keywords: ice-on-valid-code Severity: normal Priority: P3 Component: target Assignee: unassigned at gcc dot gnu.org Reporter: asolokha at gmx dot com Target Milestone: --- Target: x86_64-unknown-linux-gnu gcc-9.0.0-alpha20181202 snapshot (r266729) ICE when compiling the following snippet at any optimization level except -Og and w/ -msse4.1 -fpack-struct: typedef long int __attribute__ ((__vector_size__ (2 * sizeof (long int)))) v2si; union df { v2si se[2]; }; void qg (union df *jz, union df *pl) { jz->se[0] = jz->se[0] == pl->se[0]; } % x86_64-unknown-linux-gnu-gcc-9.0.0-alpha20181202 -msse4.1 -O1 -fpack-struct -c eysik9hz.c eysik9hz.c: In function 'qg': eysik9hz.c:11:1: error: unrecognizable insn: 11 | } | ^ (insn 8 7 9 2 (set (reg:V2DI 89) (eq:V2DI (reg:V2DI 87) (mem/j:V2DI (reg/v/f:DI 86 [ pl ]) [1 *pl_6(D)+0 S16 A8]))) "eysik9hz.c":10:25 -1 (nil)) during RTL pass: vregs eysik9hz.c:11:1: internal compiler error: in extract_insn, at recog.c:2305 0x668df7 _fatal_insn(char const*, rtx_def const*, char const*, int, char const*) /var/tmp/portage/sys-devel/gcc-9.0.0_alpha20181202/work/gcc-9-20181202/gcc/rtl-error.c:108 0x668e13 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*) /var/tmp/portage/sys-devel/gcc-9.0.0_alpha20181202/work/gcc-9-20181202/gcc/rtl-error.c:116 0x666f6d extract_insn(rtx_insn*) /var/tmp/portage/sys-devel/gcc-9.0.0_alpha20181202/work/gcc-9-20181202/gcc/recog.c:2305 0xa3d813 instantiate_virtual_regs_in_insn /var/tmp/portage/sys-devel/gcc-9.0.0_alpha20181202/work/gcc-9-20181202/gcc/function.c:1650 0xa3d813 instantiate_virtual_regs /var/tmp/portage/sys-devel/gcc-9.0.0_alpha20181202/work/gcc-9-20181202/gcc/function.c:2020 0xa3d813 execute /var/tmp/portage/sys-devel/gcc-9.0.0_alpha20181202/work/gcc-9-20181202/gcc/function.c:2069