[Bug c/64687] New: powerpc: GCC 5.0 (trunk at 219851) build failure for powerpc with hardware decimal floating point disabled

["azanella at linux dot vnet.ibm.com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64687

            Bug ID: 64687
           Summary: powerpc: GCC 5.0 (trunk@219851) build failure for
                    powerpc with hardware decimal floating point disabled
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: azanella at linux dot vnet.ibm.com

Created attachment 34499
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34499&action=edit
Testcase to trigger the issue

GCC 5.0 (trunk@219851) trigger the following issue when building a C file with
Decimal types for powerpc64 with hardware decimal floating point disabled
(-DSHARED -O3 -fpic -ggdb3 -mno-hard-dfp):

../libdfp-git/sysdeps/dpd/decode.c: In function â__decoded32â:
../libdfp-git/sysdeps/dpd/decode.c:77:1: error: insn does not satisfy its
constraints:
 }
 ^
(insn 278 13 279 2 (set (mem/c:SD (plus:DI (reg/f:DI 1 1)
                (const_int -16 [0xfffffffffffffff0])) [18 %sfp+48 S4 A32])
        (reg:SD 33 1)) ../libdfp-git/sysdeps/dpd/decode.c:40 492
{movsd_hardfloat}
     (nil))
../libdfp-git/sysdeps/dpd/decode.c:77:1: internal compiler error: in
extract_constrain_insn, at recog.c:2246
0x105f6b13 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        ../../gcc-git/gcc/rtl-error.c:110
0x105f6b6b _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        ../../gcc-git/gcc/rtl-error.c:121
0x105bf81b extract_constrain_insn(rtx_insn*)
        ../../gcc-git/gcc/recog.c:2246
0x1059c8d7 reload_cse_simplify_operands
        ../../gcc-git/gcc/postreload.c:430
0x1059dd33 reload_cse_simplify
        ../../gcc-git/gcc/postreload.c:207
0x1059dd33 reload_cse_regs_1
        ../../gcc-git/gcc/postreload.c:246
0x1059f9d7 reload_cse_regs
        ../../gcc-git/gcc/postreload.c:94
0x1059f9d7 execute
        ../../gcc-git/gcc/postreload.c:2367


Temporary files in attachments (decode.i and decode.s), to reproduce just
issue:

$ gcc decode.i -c -DSHARED -O3 -fpic -ggdb3 -mno-hard-dfp