[Bug target/65710] New: [5 Regression] Thumb1 ICE caused by no register to spill

["terry.guo at arm dot com" <gcc-bugzilla@gcc.gnu.org>]

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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65710

            Bug ID: 65710
           Summary: [5 Regression] Thumb1 ICE caused by no register to
                    spill
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: terry.guo at arm dot com

Created attachment 35268
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35268&action=edit
test case

Revision 221867 is the fix to PR65647. But it causes another ICE for thumb1
target as below:

$./install/bin/arm-none-eabi-gcc -mthumb -O2 -S regex.i 
regex.i: In function ‘byte_re_match_2_internal’:
regex.i:10121:1: error: unable to find a register to spill
 }
 ^
regex.i:10121:1: error: this is the insn:
(insn 12390 15093 12392 2 (set (reg:SI 8731 [8730])
        (plus:SI (reg:SI 8731 [8730])
            (reg:SI 10838))) regex.i:8483 718 {*thumb1_addsi3}
     (expr_list:REG_DEAD (reg:SI 10838)
        (nil)))
regex.i:10121:1: internal compiler error: in assign_by_spills, at
lra-assigns.c:1419
0xa36eea _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
    ../../src/gcc/gcc/rtl-error.c:110
0x9521e7 assign_by_spills
    ../../src/gcc/gcc/lra-assigns.c:1419
0x952bd3 lra_assign()
    ../../src/gcc/gcc/lra-assigns.c:1594
0x94e919 lra(_IO_FILE*)
    ../../src/gcc/gcc/lra.c:2360
0x90cc09 do_reload
    ../../src/gcc/gcc/ira.c:5418
0x90cc09 execute
    ../../src/gcc/gcc/ira.c:5589
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.

This issue still happens to the latest trunk.
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From: "a.vogt at fulguritus dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/65684] Wrong error message when writing to a string
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ide684

Alexander Vogt <a.vogt at fulguritus dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #35263|0                           |1
        is obsolete|                            |

--- Comment #11 from Alexander Vogt <a.vogt at fulguritus dot com> ---
Created attachment 35269
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id5269&actioníit
Improved wording