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Date: Thu, 15 Jan 2009 19:19:00 -0000
Subject: [Bug middle-end/38857]  New: [4.4 Regression] ICE in selective scheduler
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From: "sje at cup dot hp dot com" <gcc-bugzilla@gcc.gnu.org>
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With this test case the selective scheduler is hitting a gcc_assert in
sel-sched-ir.c  I see this on IA64 Linux or on IA64 HP-UX when in 64 bit mode. 

In both cases it happens when compiling with -O3.

x.c: In function 'dv_guess_qnos':
x.c:22: internal compiler error: in sel_move_insn, at sel-sched-ir.c:1395
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.


Test case:


static const int vs_total_ac_bits = 2680;
typedef struct EncBlockInfo {
      short mb[64];
      unsigned char next[64];
} EncBlockInfo;
inline void dv_guess_qnos(EncBlockInfo* blks, int* qnos) {
      int size[5];
      int j, k, a, prev;
      EncBlockInfo* b;
      for(a=2; a==2 || vs_total_ac_bits < size[0]; a+=a){
         for (j=0; j<6*5; j++, b++) {
             for (k= b->next[prev]; k<64; k= b->next[k]) {
                 if(b->mb[k] < a && b->mb[k] > -a){
                     b->next[prev] = b->next[k];
                 }
                 else{
                     prev = k;
                 }
             }
         }
     }
}


-- 
           Summary: [4.4 Regression] ICE in selective scheduler
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: sje at cup dot hp dot com
GCC target triplet: ia64-*-*


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38857