[Bug middle-end/91957] New: [10 Regression] ICE in lra_assign building libgcc for csky-linux-gnuabiv2 soft-float

[jsm28 at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91957

            Bug ID: 91957
           Summary: [10 Regression] ICE in lra_assign building libgcc for
                    csky-linux-gnuabiv2 soft-float
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jsm28 at gcc dot gnu.org
                CC: rsandifo at gcc dot gnu.org
  Target Milestone: ---
            Target: csky*-*-*

Created attachment 46988
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46988&action=edit
preprocessed source

The function-ABI changes (r276306 is OK, r276339 fails) appear to have
introduced an ICE building libgcc for csky-linux-gnuabiv2 soft-float (configure
options: --disable-multilib).  Preprocessed source attached.  Compile with -O2.
 ICE seen with current sources (r276417) is as follows.  In the hard-float
case, libgcc builds OK but there is a similar ICE building glibc, which I guess
has the same cause so I haven't filed a separate bug for it.

/scratch/jmyers/glibc/many10/src/gcc/libgcc/libgcc2.c: In function '__mulsc3':
/scratch/jmyers/glibc/many10/src/gcc/libgcc/libgcc2.c:2030:1: internal compiler
error: in lra_assign, at lra-assigns.c:1647
 2030 | }
      | ^
0x9feabc lra_assign(bool&)
        /scratch/jmyers/glibc/many10/src/gcc/gcc/lra-assigns.c:1647
0x9f9314 lra(_IO_FILE*)
        /scratch/jmyers/glibc/many10/src/gcc/gcc/lra.c:2482
0x9ad1f1 do_reload
        /scratch/jmyers/glibc/many10/src/gcc/gcc/ira.c:5511
0x9ad1f1 execute
        /scratch/jmyers/glibc/many10/src/gcc/gcc/ira.c:5697
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
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