[Bug target/60298] New: [ARM/Thumb1] ICE caused by LRA for case pr54713-1.c

[terry.guo at arm dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60298

            Bug ID: 60298
           Summary: [ARM/Thumb1] ICE caused by LRA for case pr54713-1.c
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: terry.guo at arm dot com

Created attachment 32185
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=32185&action=edit
case to reproduce the ICE

This issue is found during regression test of latest trunk for Thumb-1 target
Cortex-M0. Here is command to reproduce this issue:

terguo01@terry-pc01:case$ ../install-native/bin/arm-none-eabi-gcc  -O0 -w -c
-mthumb -mcpu=cortex-m0 -o pr54713-1.o pr54713-1.c 
pr54713-1.c: In function 'f10':
pr54713-1.c:70:1: internal compiler error: Segmentation fault
 }
 ^
0xb1b7ce crash_signal
    /myssd/terguo01/toolchain-build/lra-regression/src/gcc/gcc/toplev.c:337
0xaeccbf simplify_replace_fn_rtx(rtx_def*, rtx_def const*, rtx_def*
(*)(rtx_def*, rtx_def const*, void*), void*)
   
/myssd/terguo01/toolchain-build/lra-regression/src/gcc/gcc/simplify-rtx.c:417
0x9a6df3 update_equiv
   
/myssd/terguo01/toolchain-build/lra-regression/src/gcc/gcc/lra-constraints.c:351
0x9b06e7 lra_constraints(bool)
   
/myssd/terguo01/toolchain-build/lra-regression/src/gcc/gcc/lra-constraints.c:4054
0x99d609 lra(_IO_FILE*)
    /myssd/terguo01/toolchain-build/lra-regression/src/gcc/gcc/lra.c:2339
0x94b7af do_reload
    /myssd/terguo01/toolchain-build/lra-regression/src/gcc/gcc/ira.c:5457
0x94baf8 rest_of_handle_reload
    /myssd/terguo01/toolchain-build/lra-regression/src/gcc/gcc/ira.c:5598
0x94bb42 execute
    /myssd/terguo01/toolchain-build/lra-regression/src/gcc/gcc/ira.c:5627
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.