https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103974
Bug ID: 103974
Summary: [12 Regression] ICE in ira_flattening building
libstdc++ with r12-6415-g01f3e6a40e72
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Keywords: build, ice-on-valid-code
Severity: normal
Priority: P3
Component: bootstrap
Assignee: unassigned at gcc dot gnu.org
Reporter: hp at gcc dot gnu.org
CC: rsandifo at gcc dot gnu.org
Target Milestone: ---
Host: x86_64-linux
Target: cris-elf
Commit r12-6415-g01f3e6a40e72, "[PATCH 27/33] ira: Consider modelling
caller-save allocations as loop spills" caused build to break for cris-elf,
when building the v10 multilib of libstdc++-v3, specifically
v10/libstdc++-v3/src/c++17 floating_to_chars.cc, like so:
libtool: compile: /tmp/X/gccobj/./gcc/xgcc -shared-libgcc
-B/tmp/X/gccobj/./gcc -nostdinc++ -L/tmp/X/gccobj/cris-elf/v10/libstdc++-v3/src
-L/tmp/X/gccobj/cris-elf/v10/libstdc++-v3/src/.libs
-L/tmp/X/gccobj/cris-elf/v10/libstdc++-v3/libsupc++/.libs -nostdinc
-B/tmp/X/gccobj/cris-elf/v10/newlib/ -isystem
/tmp/X/gccobj/cris-elf/v10/newlib/targ-include -isystem
/tmp/X/gcc/newlib/libc/include -B/tmp/X/gccobj/cris-elf/v10/libgloss/cris
-L/tmp/X/gccobj/cris-elf/v10/libgloss/libnosys -L/tmp/X/gcc/libgloss/cris
-B/tmp/X/pre/cris-elf/bin/ -B/tmp/X/pre/cris-elf/lib/ -isystem
/tmp/X/pre/cris-elf/include -isystem /tmp/X/pre/cris-elf/sys-include -march=v10
-mbest-lib-options -I/tmp/X/gcc/libstdc++-v3/../libgcc
-I/tmp/X/gccobj/cris-elf/v10/libstdc++-v3/include/cris-elf
-I/tmp/X/gccobj/cris-elf/v10/libstdc++-v3/include
-I/tmp/X/gcc/libstdc++-v3/libsupc++ -std=gnu++17 -nostdinc++
-fno-implicit-templates -Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi=2
-fdiagnostics-show-location=once -ffunction-sections -fdata-sections
-frandom-seed=floating_to_chars.lo -fimplicit-templates -g -O2 -march=v10
-mbest-lib-options -c /tmp/X/gcc/libstdc++-v3/src/c++17/floating_to_chars.cc -o
floating_to_chars.o
/tmp/X/gcc/libstdc++-v3/src/c++17/floating_to_chars.cc:561:3: warning:
'std::to_chars_result {anonymous}::to_chars(char*, char*, uint128_t)' defined
but not used [-Wunused-function]
561 | to_chars(char* first, char* const last, uint128_t x)
| ^~~~~~~~
/tmp/X/gcc/libstdc++-v3/src/c++17/floating_to_chars.cc:554:3: warning: 'int
{anonymous}::get_mantissa_length(ryu::generic128::floating_decimal_128)'
defined but not used [-Wunused-function]
554 | get_mantissa_length(const ryu::floating_decimal_128 fd)
| ^~~~~~~~~~~~~~~~~~~
/tmp/X/gcc/libstdc++-v3/src/c++17/floating_to_chars.cc:127:5: warning: 'int
{anonymous}::ryu::to_chars(generic128::floating_decimal_128, char*)' defined
but not used [-Wunused-function]
127 | to_chars(const floating_decimal_128 v, char* const result)
| ^~~~~~~~
during RTL pass: ira
/tmp/X/gcc/libstdc++-v3/src/c++17/floating_to_chars.cc: In function
'std::to_chars_result std::__floating_to_chars_shortest(char*, char*, T,
chars_format) [with T = double]':
/tmp/X/gcc/libstdc++-v3/src/c++17/floating_to_chars.cc:1106:3: internal
compiler error: in ira_flattening, at ira-build.c:3213
1106 | }
| ^
0x708412 ira_flattening(int, int)
/tmp/X/gcc/gcc/ira-build.c:3213
0xe7c9b8 ira
/tmp/X/gcc/gcc/ira.c:5807
0xe7c9b8 execute
/tmp/X/gcc/gcc/ira.c:6075
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.
I'll attach a brief gdb inspection session.
