https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107743
Bug ID: 107743
Summary: expmed: extract_bit_field_1: maybe-uninitialized
warning
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: aldot at gcc dot gnu.org
Target Milestone: ---
current trunk around r13-4134
/scratch/obj.x86_64/gcc-13.mine/./prev-gcc/xg++
-B/scratch/obj.x86_64/gcc-13.mine/./prev-gcc/
-B/opt/x86_64/gcc-13.mine/x86_64-pc-linux-gnu/bin/ -nostdinc++
-B/scratch/obj.x86_64/gcc-13.mine/prev-x86_64-pc-linux-gnu/libstdc++-v3/src/.libs
-B/scratch/obj.x86_64/gcc-13.mine/prev-x86_64-pc-linux-gnu/libstdc++-v3/libsupc++/.libs
-I/scratch/obj.x86_64/gcc-13.mine/prev-x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu
-I/scratch/obj.x86_64/gcc-13.mine/prev-x86_64-pc-linux-gnu/libstdc++-v3/include
-I/scratch/src/gcc-13.mine/libstdc++-v3/libsupc++
-L/scratch/obj.x86_64/gcc-13.mine/prev-x86_64-pc-linux-gnu/libstdc++-v3/src/.libs
-L/scratch/obj.x86_64/gcc-13.mine/prev-x86_64-pc-linux-gnu/libstdc++-v3/libsupc++/.libs
-fno-PIE -c -O2 -g3 -ggdb3 -gdwarf-5 -pipe -fno-checking -gtoggle -DIN_GCC
-fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall
-Wno-narrowing -Wwrite-strings -Wcast-qual -Wmissing-format-attribute
-Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros
-Wno-overlength-strings -fno-common -DHAVE_CONFIG_H -I. -I.
-I../../../src/gcc-13.mine/gcc -I../../../src/gcc-13.mine/gcc/.
-I../../../src/gcc-13.mine/gcc/../include
-I../../../src/gcc-13.mine/gcc/../libcpp/include
-I../../../src/gcc-13.mine/gcc/../libcody
-I../../../src/gcc-13.mine/gcc/../libdecnumber
-I../../../src/gcc-13.mine/gcc/../libdecnumber/bid -I../libdecnumber
-I../../../src/gcc-13.mine/gcc/../libbacktrace -o expmed.o -MT expmed.o -MMD
-MP -MF ./.deps/expmed.TPo ../../../src/gcc-13.mine/gcc/expmed.cc
../../../src/gcc-13.mine/gcc/expmed.cc: In function 'rtx_def*
extract_bit_field_1(rtx, poly_uint64, poly_uint64, int, rtx, machine_mode,
machine_mode, bool, bool, rtx_def**)':
../../../src/gcc-13.mine/gcc/expmed.cc:1838:45: warning: '*(unsigned
int*)((char*)&imode + offsetof(scalar_int_mode, scalar_int_mode::m_mode))' may
be used uninitialized [-Wmaybe-uninitialized]
1838 | rtx sub = extract_bit_field_as_subreg (mode1, op0, imode,
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~
1839 | bitsize, bitnum);
| ~~~~~~~~~~~~~~~~
../../../src/gcc-13.mine/gcc/expmed.cc:1798:19: note: '*(unsigned
int*)((char*)&imode + offsetof(scalar_int_mode, scalar_int_mode::m_mode))' was
declared here
1798 | scalar_int_mode imode;
| ^~~~~
