https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104121
Bug ID: 104121
Summary: [12 Regression] v850: Infinite loop in
find_reload_regno_insns()
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: sebastian.hu...@embedded-brains.de
Target Milestone: ---
Building the current master branch for the v850-rtems target results in an
infinite loop in find_reload_regno_insns() while building libgcc:
/tmp/sh/b-gcc-v850-rtems6/v850-rtems6/v850e2v3/libgcc >
/tmp/sh/b-gcc-v850-rtems6/./gcc/xgcc -B/tmp/sh/b-gcc-v850-rtems6/./gcc/
-nostdinc -B/tmp/sh/b-gcc-v850-rtems6/v850-rtems6/newlib/ -isystem
/tmp/sh/b-gcc-v850-rtems6/v850-rtems6/newlib/targ-include -isystem
/home/EB/sebastian_h/src/gcc/newlib/libc/include
-B/tmp/sh/i-v850-rtems6/v850-rtems6/bin/
-B/tmp/sh/i-v850-rtems6/v850-rtems6/lib/ -isystem
/tmp/sh/i-v850-rtems6/v850-rtems6/include -isystem
/tmp/sh/i-v850-rtems6/v850-rtems6/sys-include -g -O2 -mv850e2v3 -O2
-I/home/EB/sebastian_h/src/gcc/libgcc/../newlib/libc/sys/rtems/include -g -O2
-DIN_GCC -DCROSS_DIRECTORY_STRUCTURE -W -Wall -Wno-narrowing -Wwrite-strings
-Wcast-qual -Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition
-isystem ./include -mno-app-regs -msmall-sld -Wa,-mwarn-signed-overflow
-Wa,-mwarn-unsigned-overflow -g -DIN_LIBGCC2 -fbuilding-libgcc
-fno-stack-protector -Dinhibit_libc -I. -I. -I../../.././gcc
-I/home/EB/sebastian_h/src/gcc/libgcc -I/home/EB/sebastian_h/src/gcc/libgcc/.
-I/home/EB/sebastian_h/src/gcc/libgcc/../gcc
-I/home/EB/sebastian_h/src/gcc/libgcc/../include -DHAVE_CC_TLS -DUSE_EMUTLS
-o _muldc3.o -MT _muldc3.o -MD -MP -MF _muldc3.dep -DL_muldc3 -c
/home/EB/sebastian_h/src/gcc/libgcc/libgcc2.c -fvisibility=hidden
-DHIDE_EXPORTS -wrapper gdb,--args
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Reading symbols from /tmp/sh/b-gcc-v850-rtems6/./gcc/cc1...
(gdb) r
Starting program: /tmp/sh/b-gcc-v850-rtems6/gcc/cc1 -quiet -nostdinc -I
/home/EB/sebastian_h/src/gcc/libgcc/../newlib/libc/sys/rtems/include -I . -I .
-I ../../.././gcc -I /home/EB/sebastian_h/src/gcc/libgcc -I
/home/EB/sebastian_h/src/gcc/libgcc/. -I
/home/EB/sebastian_h/src/gcc/libgcc/../gcc -I
/home/EB/sebastian_h/src/gcc/libgcc/../include -imultilib v850e2v3 -iprefix
/tmp/sh/b-gcc-v850-rtems6/gcc/../lib64/gcc/v850-rtems6/12.0.1/ -isystem
/tmp/sh/b-gcc-v850-rtems6/./gcc/include -isystem
/tmp/sh/b-gcc-v850-rtems6/./gcc/include-fixed -MD _muldc3.d -MF _muldc3.dep -MP
-MT _muldc3.o -D__v850e2v3__ -D IN_GCC -D CROSS_DIRECTORY_STRUCTURE -D
IN_LIBGCC2 -D inhibit_libc -D HAVE_CC_TLS -D USE_EMUTLS -D L_muldc3 -D
HIDE_EXPORTS -isystem /tmp/sh/b-gcc-v850-rtems6/v850-rtems6/newlib/targ-include
-isystem /home/EB/sebastian_h/src/gcc/newlib/libc/include -isystem
/tmp/sh/i-v850-rtems6/v850-rtems6/include -isystem
/tmp/sh/i-v850-rtems6/v850-rtems6/sys-include -isystem ./include
/home/EB/sebastian_h/src/gcc/libgcc/libgcc2.c -quiet -dumpbase _muldc3.c
-dumpbase-ext .c -mv850e2v3 -mno-app-regs -msmall-sld -g -g -g -O2 -O2 -O2
-Wextra -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -Wstrict-prototypes
-Wmissing-prototypes -Wold-style-definition -fbuilding-libgcc
-fno-stack-protector -fvisibility=hidden -o /tmp/ccXJQ7zz.s
Missing separate debuginfos, use: zypper install
glibc-debuginfo-2.26-lp152.26.12.1.x86_64
^C
Program received signal SIGINT, Interrupt.
0x0000000000982526 in find_reload_regno_insns (finish=<synthetic pointer>:
<optimized out>, start=<synthetic pointer>: <optimized out>, regno=410) at
/home/EB/sebastian_h/src/gcc/gcc/lra-assigns.cc:1740
1740 if (next_insn != NULL && second_insn == NULL)
(gdb) n
1727 n != 1 && (prev_insn != NULL || next_insn != NULL); )
(gdb)
1729 if (prev_insn != NULL && first_insn == NULL)
(gdb)
1740 if (next_insn != NULL && second_insn == NULL)
(gdb)
1727 n != 1 && (prev_insn != NULL || next_insn != NULL); )
(gdb)
1729 if (prev_insn != NULL && first_insn == NULL)
(gdb)
1740 if (next_insn != NULL && second_insn == NULL)
(gdb)
1727 n != 1 && (prev_insn != NULL || next_insn != NULL); )
(gdb)
1729 if (prev_insn != NULL && first_insn == NULL)
(gdb)
1740 if (next_insn != NULL && second_insn == NULL)
(gdb)
1727 n != 1 && (prev_insn != NULL || next_insn != NULL); )
(gdb)
1729 if (prev_insn != NULL && first_insn == NULL)
(gdb) bt
#0 find_reload_regno_insns (finish=<synthetic pointer>: <optimized out>,
start=<synthetic pointer>: <optimized out>, regno=410) at
/home/EB/sebastian_h/src/gcc/gcc/lra-assigns.cc:1729
#1 lra_split_hard_reg_for () at
/home/EB/sebastian_h/src/gcc/gcc/lra-assigns.cc:1794
#2 0x000000000097cbac in lra (f=<optimized out>) at
/home/EB/sebastian_h/src/gcc/gcc/lra.cc:2412
#3 0x000000000092d422 in do_reload () at
/home/EB/sebastian_h/src/gcc/gcc/ira.cc:5934
#4 (anonymous namespace)::pass_reload::execute (this=<optimized out>) at
/home/EB/sebastian_h/src/gcc/gcc/ira.cc:6120
#5 0x0000000000a564d9 in execute_one_pass (pass=pass@entry=0x1ef3d40) at
/home/EB/sebastian_h/src/gcc/gcc/passes.cc:2637
#6 0x0000000000a56df1 in execute_pass_list_1 (pass=0x1ef3d40) at
/home/EB/sebastian_h/src/gcc/gcc/passes.cc:2737
#7 0x0000000000a56e03 in execute_pass_list_1 (pass=0x1ef2ba0) at
/home/EB/sebastian_h/src/gcc/gcc/passes.cc:2738
#8 0x0000000000a56e45 in execute_pass_list (fn=<optimized out>,
pass=<optimized out>) at /home/EB/sebastian_h/src/gcc/gcc/passes.cc:2748
#9 0x0000000000658fd9 in cgraph_node::expand (this=0x7ffff75d2330) at
/home/EB/sebastian_h/src/gcc/gcc/cgraphunit.cc:1834
#10 0x000000000065a887 in expand_all_functions () at
/home/EB/sebastian_h/src/gcc/gcc/cgraphunit.cc:1998
#11 symbol_table::compile (this=this@entry=0x7ffff74ea000) at
/home/EB/sebastian_h/src/gcc/gcc/cgraphunit.cc:2348
#12 0x000000000065df70 in symbol_table::compile (this=0x7ffff74ea000) at
/home/EB/sebastian_h/src/gcc/gcc/cgraphunit.cc:2532
#13 symbol_table::finalize_compilation_unit (this=0x7ffff74ea000) at
/home/EB/sebastian_h/src/gcc/gcc/cgraphunit.cc:2529
#14 0x0000000000b4edde in compile_file () at
/home/EB/sebastian_h/src/gcc/gcc/toplev.cc:479
#15 0x000000000045e2ce in do_compile (no_backend=false) at
/home/EB/sebastian_h/src/gcc/gcc/toplev.cc:2158
#16 toplev::main (this=this@entry=0x7fffffffd11e, argc=<optimized out>,
argc@entry=89, argv=<optimized out>, argv@entry=0x7fffffffd218) at
/home/EB/sebastian_h/src/gcc/gcc/toplev.cc:2310
#17 0x00000000004606bb in main (argc=89, argv=0x7fffffffd218) at
/home/EB/sebastian_h/src/gcc/gcc/main.cc:39
