[Bug target/89424] New: __builtin_vec_ext_v1ti (v, i) results in ICE with variable i (RS6000)

[kelvin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89424

            Bug ID: 89424
           Summary: __builtin_vec_ext_v1ti (v, i) results in ICE with
                    variable i (RS6000)
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: kelvin at gcc dot gnu.org
  Target Milestone: ---
            Target: rs6000
             Build: 9.0.1

Created attachment 45781
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45781&action=edit
preprocessed source code for reproducer

The __builtin_vec_ext_v1ti (v, i) function should work with both constant and
variable values of int i.

With current trunk

  $GCC_BUILD/GCC/xgcc -B$gcc_build/GCC/ -maltivec -mvsx -O1 -o problem.exe
problem.c

ends with an internal cmopiler error:
during RTL pass: expand
prXXXXX-0.c: In function ‘ei’:
prXXXXX-0.c:25:10: internal compiler error: in rs6000_expand_vector_extract, at
config/rs6000/rs6000.c:6970
   25 |   return __builtin_vec_ext_v1ti (v, i);
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
0x10faeabf rs6000_expand_vector_extract(rtx_def*, rtx_def*, rtx_def*)
        /home/kelvin/gcc-root/gcc-trunk2/gcc/config/rs6000/rs6000.c:6970
0x10feeeaf altivec_expand_vec_ext_builtin
        /home/kelvin/gcc-root/gcc-trunk2/gcc/config/rs6000/rs6000.c:14736
0x10feeeaf altivec_expand_builtin
        /home/kelvin/gcc-root/gcc-trunk2/gcc/config/rs6000/rs6000.c:14969
0x10ff1def rs6000_expand_builtin
        /home/kelvin/gcc-root/gcc-trunk2/gcc/config/rs6000/rs6000.c:16530
0x1034702b expand_builtin(tree_node*, rtx_def*, rtx_def*, machine_mode, int)
        /home/kelvin/gcc-root/gcc-trunk2/gcc/builtins.c:7226
0x10557feb expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
        /home/kelvin/gcc-root/gcc-trunk2/gcc/expr.c:11025
0x1056d8f3 store_expr(tree_node*, rtx_def*, int, bool, bool)
        /home/kelvin/gcc-root/gcc-trunk2/gcc/expr.c:5669
0x10571463 expand_assignment(tree_node*, tree_node*, bool)
        /home/kelvin/gcc-root/gcc-trunk2/gcc/expr.c:5432
0x10571463 expand_assignment(tree_node*, tree_node*, bool)
        /home/kelvin/gcc-root/gcc-trunk2/gcc/expr.c:4978
0x1038082b expand_call_stmt
        /home/kelvin/gcc-root/gcc-trunk2/gcc/cfgexpand.c:2722
0x1038082b expand_gimple_stmt_1
        /home/kelvin/gcc-root/gcc-trunk2/gcc/cfgexpand.c:3691
0x1038082b expand_gimple_stmt
        /home/kelvin/gcc-root/gcc-trunk2/gcc/cfgexpand.c:3850
0x1038959f expand_gimple_basic_block
        /home/kelvin/gcc-root/gcc-trunk2/gcc/cfgexpand.c:5886
0x1038be27 execute
        /home/kelvin/gcc-root/gcc-trunk2/gcc/cfgexpand.c:6509
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.
Makefile:26: recipe for target 'prXXXXX-0.exe' failed
make: *** [prXXXXX-0.exe] Error 1
kelvin@genoa:~/gcc-root/tests$