[Bug target/82098] New: [8 regression] internal compiler error: in elimination_costs_in_insn, at reload1.c:3616, -march=i686

[arnd at linaro dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82098

            Bug ID: 82098
           Summary: [8 regression] internal compiler error: in
                    elimination_costs_in_insn, at reload1.c:3616,
                    -march=i686
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: arnd at linaro dot org
  Target Milestone: ---

Created attachment 42114
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42114&action=edit
linux/drivers/gpio/gpio-bcm-kona.c, preprocessed and compressed

Building the Linux kernel with today's r251641 snapshoy, I encountered several
internal compiler errors in gpio device drivers, all on x86, and all with the
same call chain:

$ x86_64-linux-gcc-8.0.0 -m32 -march=i686 -O2 -c gpio-bcm-kona.i
/git/arm-soc/drivers/gpio/gpio-bcm-kona.c: In function 'bcm_kona_gpio_irq_ack':
/git/arm-soc/drivers/gpio/gpio-bcm-kona.c:357:1: internal compiler error: in
elimination_costs_in_insn, at reload1.c:3616
 }
 ^
0xa484cb elimination_costs_in_insn
        /home/arnd/git/gcc/gcc/reload1.c:3613
0xa48f3f calculate_elim_costs_all_insns()
        /home/arnd/git/gcc/gcc/reload1.c:1607
0x9299cf ira_costs()
        /home/arnd/git/gcc/gcc/ira-costs.c:2255
0x923152 ira_build()
        /home/arnd/git/gcc/gcc/ira-build.c:3420
0x91ad5c ira
        /home/arnd/git/gcc/gcc/ira.c:5270
0x91ad5c execute
        /home/arnd/git/gcc/gcc/ira.c:5581

I have attached the preprocessed source file, but have not yet created a
reduced test case. The previous snapshot I used was r251220, dated Aug 21, and
did not produce this ICE.