[Bug rtl-optimization/82482] New: ICE in qsort comparator non-negative on sorted output: 1 in fast_allocation at ira-color.c:4821

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82482

            Bug ID: 82482
           Summary: ICE in qsort comparator non-negative on sorted output:
                    1 in fast_allocation at ira-color.c:4821
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code, ra
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
  Target Milestone: ---

Following test-case ICEs:

$ gcc /home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/tree-prof/pr44777.c -O1
--param ira-max-conflict-table-size=0
/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/tree-prof/pr44777.c: In
function ‘y’:
/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/tree-prof/pr44777.c:31:5:
error: qsort comparator non-negative on sorted output: 1
     }
     ^
during RTL pass: ira
/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/tree-prof/pr44777.c:31:5:
internal compiler error: qsort checking failed
0x1458639 qsort_chk_error
        ../../gcc/vec.c:222
0x1458a01 qsort_chk(void*, unsigned long, unsigned long, int (*)(void const*,
void const*))
        ../../gcc/vec.c:274
0xa19f60 fast_allocation
        ../../gcc/ira-color.c:4821
0xa19f60 ira_color()
        ../../gcc/ira-color.c:4899
0x9ffcea ira
        ../../gcc/ira.c:5283
0x9ffcea execute
        ../../gcc/ira.c:5581