[Bug target/103722] New: [12 Regression] ICE in extract_constrain_insn building glibc for SH4

[jsm28 at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103722

            Bug ID: 103722
           Summary: [12 Regression] ICE in extract_constrain_insn building
                    glibc for SH4
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jsm28 at gcc dot gnu.org
                CC: vmakarov at gcc dot gnu.org
  Target Milestone: ---
            Target: sh4*-*-*

Created attachment 52003
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52003&action=edit
preprocessed source

Build the attached code (from glibc) with -O2 for sh4-linux-gnu.  This produces
an ICE:

malloc-debug.c: In function '__debug_realloc':
malloc-debug.c:267:1: error: insn does not satisfy its constraints:
(insn 955 1863 2 2 (set (reg:SI 76 fr12 [314])
        (reg:SI 146 pr)) 189 {movsi_ie}
     (nil))
during RTL pass: postreload
malloc-debug.c:267:1: internal compiler error: in extract_constrain_insn, at
recog.c:2670
0x5eec04 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        /scratch/jmyers/glibc/many12/src/gcc/gcc/rtl-error.c:108
0x5eec2a _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        /scratch/jmyers/glibc/many12/src/gcc/gcc/rtl-error.c:119
0xcab367 extract_constrain_insn(rtx_insn*)
        /scratch/jmyers/glibc/many12/src/gcc/gcc/recog.c:2670
0xc71acd reload_cse_simplify_operands
        /scratch/jmyers/glibc/many12/src/gcc/gcc/postreload.c:407
0xc732bc reload_cse_simplify
        /scratch/jmyers/glibc/many12/src/gcc/gcc/postreload.c:190
0xc732bc reload_cse_regs_1
        /scratch/jmyers/glibc/many12/src/gcc/gcc/postreload.c:238
0xc7584b reload_cse_regs
        /scratch/jmyers/glibc/many12/src/gcc/gcc/postreload.c:66
0xc7584b execute
        /scratch/jmyers/glibc/many12/src/gcc/gcc/postreload.c:2355
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.

This was introduced (exposed?) by:

commit a7acb6dca941db2b1c135107dac3a34a20650d5c
Author: Vladimir N. Makarov <vmaka...@redhat.com>
Date:   Mon Dec 13 13:48:12 2021 -0500

    [PR99531] Modify pseudo class cost calculation when processing move
involving the pseudo and a hard register