[Bug middle-end/96136] New: [11 regression] ICE in reduce_to_bit_field_precision

[clyon at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96136

            Bug ID: 96136
           Summary: [11 regression] ICE in reduce_to_bit_field_precision
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: clyon at gcc dot gnu.org
  Target Milestone: ---

Hi,

Since r11-1914-g760df6d296b8fc59796f42dca5eb14012fbfa28b, I've noticed an ICE
while building glibc-2.29 when GCC is configured --target
arm-none-linux-gnueabihf  --with-cpu cortex-a15 --with-mode thumb --with-fpu
neon-vfpv4

$ arm-none-linux-gnueabihf-gcc -c -O2 iso646.i
during RTL pass: expand
In file included from iso646.c:901:
../iconv/skeleton.c: In function 'gconv':
../iconv/skeleton.c:390:1: internal compiler error: in
reduce_to_bit_field_precision, at expr.c:11530
  390 | FUNCTION_NAME (struct __gconv_step *step, struct __gconv_step_data
*data,
      | ^~~~~
0x92fdc3 reduce_to_bit_field_precision
       
/home/christophe.lyon/src/GCC/sources/gcc-fsf-git/trunk/gcc/expr.c:11530
0x9397b9 expand_expr_real_2(separate_ops*, rtx_def*, machine_mode,
expand_modifier)
        /home/christophe.lyon/src/GCC/sources/gcc-fsf-git/trunk/gcc/expr.c:9276
0x9254c0 expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
       
/home/christophe.lyon/src/GCC/sources/gcc-fsf-git/trunk/gcc/expr.c:10152
0x92fbbe expand_expr
        /home/christophe.lyon/src/GCC/sources/gcc-fsf-git/trunk/gcc/expr.h:282
0x92fbbe expand_operands(tree_node*, tree_node*, rtx_def*, rtx_def**,
rtx_def**, expand_modifier)
        /home/christophe.lyon/src/GCC/sources/gcc-fsf-git/trunk/gcc/expr.c:8065
0x939972 expand_cond_expr_using_cmove
        /home/christophe.lyon/src/GCC/sources/gcc-fsf-git/trunk/gcc/expr.c:8519
0x939972 expand_expr_real_2(separate_ops*, rtx_def*, machine_mode,
expand_modifier)
        /home/christophe.lyon/src/GCC/sources/gcc-fsf-git/trunk/gcc/expr.c:9869
0x7ead60 expand_gimple_stmt_1
       
/home/christophe.lyon/src/GCC/sources/gcc-fsf-git/trunk/gcc/cfgexpand.c:3787
0x7ead60 expand_gimple_stmt
       
/home/christophe.lyon/src/GCC/sources/gcc-fsf-git/trunk/gcc/cfgexpand.c:3847
0x7f20cb expand_gimple_basic_block
       
/home/christophe.lyon/src/GCC/sources/gcc-fsf-git/trunk/gcc/cfgexpand.c:5888
0x7f47bb execute
       
/home/christophe.lyon/src/GCC/sources/gcc-fsf-git/trunk/gcc/cfgexpand.c:6572