https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94088
Bug ID: 94088 Summary: [10 Regression] ICE: in extract_insn, at recog.c:2294 (error: unrecognizable insn), or ICE: in elimination_costs_in_insn, at reload1.c:3538 Product: gcc Version: 10.0 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 1. gcc-10.0.1-alpha20200301 snapshot (g:151bf47e78f5d919f6cc591d11cc1f6aff61078f) ICEs when compiling the following testcase w/ -mtbm -O1 -fira-loop-pressure -fno-dce: double va (int cq) { return cq / (4294950402u % -65472 + 161); } % x86_64-unknown-linux-gnu-gcc-10.0.1 -mtbm -O1 -fira-loop-pressure -fno-dce -c xqyjrkzc.c xqyjrkzc.c: In function 'va': xqyjrkzc.c:5:1: error: unrecognizable insn: 5 | } | ^ (insn 39 13 18 2 (set (reg:CCGOC 17 flags) (compare:CCGOC (and:DI (reg:DI 87) (const_int 4294934528 [0xffff8000])) (const_int 0 [0]))) "xqyjrkzc.c":4:13 -1 (expr_list:REG_DEAD (reg:DI 87) (expr_list:REG_UNUSED (reg:CCGOC 17 flags) (nil)))) during RTL pass: ira xqyjrkzc.c:5:1: internal compiler error: in extract_insn, at recog.c:2294 0x686c5d _fatal_insn(char const*, rtx_def const*, char const*, int, char const*) /var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200301/work/gcc-10-20200301/gcc/rtl-error.c:108 0x686c79 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*) /var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200301/work/gcc-10-20200301/gcc/rtl-error.c:116 0x68526b extract_insn(rtx_insn*) /var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200301/work/gcc-10-20200301/gcc/recog.c:2294 0xbb3ed7 scan_one_insn /var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200301/work/gcc-10-20200301/gcc/ira-costs.c:1482 0xbb3ed7 process_bb_for_costs /var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200301/work/gcc-10-20200301/gcc/ira-costs.c:1650 0xbb5ab7 find_costs_and_classes /var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200301/work/gcc-10-20200301/gcc/ira-costs.c:1757 0xbb60da ira_set_pseudo_classes(bool, _IO_FILE*) /var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200301/work/gcc-10-20200301/gcc/ira-costs.c:2311 0xba83cb ira /var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200301/work/gcc-10-20200301/gcc/ira.c:5303 0xba83cb execute /var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200301/work/gcc-10-20200301/gcc/ira.c:5666 2. Negation of -fira-loop-pressure yields the following instead: % x86_64-unknown-linux-gnu-gcc-10.0.1 -mtbm -O1 -fno-ira-loop-pressure -fno-dce -c xqyjrkzc.c during RTL pass: ira xqyjrkzc.c: In function 'va': xqyjrkzc.c:5:1: internal compiler error: in elimination_costs_in_insn, at reload1.c:3538 5 | } | ^ 0x686a2f elimination_costs_in_insn /var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200301/work/gcc-10-20200301/gcc/reload1.c:3538 0xd21ff0 calculate_elim_costs_all_insns() /var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200301/work/gcc-10-20200301/gcc/reload1.c:1605 0xbb5e0d ira_costs() /var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200301/work/gcc-10-20200301/gcc/ira-costs.c:2293 0xbb01cc ira_build() /var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200301/work/gcc-10-20200301/gcc/ira-build.c:3432 0xba6f43 ira /var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200301/work/gcc-10-20200301/gcc/ira.c:5353 0xba6f43 execute /var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200301/work/gcc-10-20200301/gcc/ira.c:5666