[Bug target/87281] New: qsort checking ICE in ia64_reorg building libgo

[jsm28 at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87281

            Bug ID: 87281
           Summary: qsort checking ICE in ia64_reorg building libgo
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jsm28 at gcc dot gnu.org
                CC: wilson at tuliptree dot org
  Target Milestone: ---
            Target: ia64-*-*

Building an all-languages cross compiler for ia64-linux-gnu, trunk r264193, I
see the following ICE building libgo (I don't know how to produce any
equivalent of preprocessed source as a self-contained testcase for Go code, and
I don't know whether this is a regression):

/scratch/jmyers/glibc/many9/src/gcc/libgo/go/bytes/bytes.go: In function
'bytes.genSplit':
/scratch/jmyers/glibc/many9/src/gcc/libgo/go/bytes/bytes.go:211:1: error: qsort
comparator non-negative on sorted output: 2
211 | func genSplit(s, sep []byte, sepSave, n int) [][]byte {
    | ^
during RTL pass: mach
/scratch/jmyers/glibc/many9/src/gcc/libgo/go/bytes/bytes.go:211:1: internal
compiler error: qsort checking failed
0x7388f2 qsort_chk_error
        /scratch/jmyers/glibc/many9/src/gcc/gcc/vec.c:201
0x7389fc qsort_chk(void*, unsigned long, unsigned long, int (*)(void const*,
void const*))
        /scratch/jmyers/glibc/many9/src/gcc/gcc/vec.c:244
0x12dbde0 gcc_qsort(void*, unsigned long, unsigned long, int (*)(void const*,
void const*))
        /scratch/jmyers/glibc/many9/src/gcc/gcc/sort.cc:238
0x11d1b40 ready_sort_real
        /scratch/jmyers/glibc/many9/src/gcc/gcc/haifa-sched.c:3089
0x11d95ca schedule_block(basic_block_def**, void*)
        /scratch/jmyers/glibc/many9/src/gcc/gcc/haifa-sched.c:6677
0x1256575 schedule_ebb(rtx_insn*, rtx_insn*, bool)
        /scratch/jmyers/glibc/many9/src/gcc/gcc/sched-ebb.c:537
0x1256bf4 schedule_ebbs()
        /scratch/jmyers/glibc/many9/src/gcc/gcc/sched-ebb.c:657
0xf40cfc ia64_reorg
        /scratch/jmyers/glibc/many9/src/gcc/gcc/config/ia64/ia64.c:9859
0xbe42c9 execute
        /scratch/jmyers/glibc/many9/src/gcc/gcc/reorg.c:3984
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.
Makefile:2941: recipe for target 'bytes.lo' failed
make[5]: *** [bytes.lo] Error 1