[Bug target/37814] New: M68k/Coldfire ICE with -O: insn does not satisfy its constraints

[Bug target/37814] New: M68k/Coldfire ICE with -O: insn does not satisfy its constraints

[jifl-bugzilla at jifvik dot org]

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain, Size: 1823 bytes --]

Compile the below (cut-down) testcase with:
m68k-elf-gcc -c fptest.c -mcpu=5282 -fomit-frame-pointer -O
(gcc 4.3.2) and you will get:
-=-=-=-=-=-
fptest.c: In function ‘do_test’:
fptest.c:21: error: insn does not satisfy its constraints:
(insn 31 114 32 2 fptest.c:11 (set (reg:SI 8 %a0 [62])
        (plus:SI (plus:SI (mult:SI (reg/f:SI 15 %sp)
                    (const_int 4 [0x4]))
                (reg:SI 9 %a1))
            (const_int 128 [0x80]))) 451 {*lea} (nil))
fptest.c:21: internal compiler error: in reload_cse_simplify_operands, at
postreload.c:395
-=-=-=-=-=-

The testcase has been trimmed down such that just about any further change, or
change in the command line args, makes it disappear. An earlier (larger)
version closer to the original code would also fail at -O2 and -O3.

-=-=-=-=-=-=-=-=-=-=-=-
static double fpt3_values[100];
void do_test( void )
{
    int count = 100;
    int loops = 200;
    double *values = fpt3_values;
    unsigned int i, j;
    volatile double sum = 0.0;
    unsigned int seed;

    seed = ((unsigned int)&i)*count;

    for( i = 0; i < count; i++ )
        values[i] = (double)seed;

    for( j = 0; j < loops ; j++ )
    {
        for( i = 0; i < count; i++ )
            sum += (((values[i%count])*(values[(i+1)%count])));
    }
}


-- 
           Summary: M68k/Coldfire ICE with -O: insn does not satisfy its
                    constraints
           Product: gcc
           Version: 4.3.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jifl-bugzilla at jifvik dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: m68k-elf


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37814

[Bug target/37814] M68k/Coldfire ICE with -O: insn does not satisfy its constraints

[schwab at suse dot de]

------- Comment #1 from schwab at suse dot de  2008-11-13 13:17 -------
I cannot reproduce that with 4.4 any more.  Please verify whether your original
test case still fails.


-- 

schwab at suse dot de changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
  GCC build triplet|i686-pc-linux-gnu           |
   GCC host triplet|i686-pc-linux-gnu           |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37814

[Bug target/37814] M68k/Coldfire ICE with -O: insn does not satisfy its constraints

[schwab at linux-m68k dot org]

------- Comment #2 from schwab at linux-m68k dot org  2009-04-12 16:22 -------
No answer in 5 months, assuming fixed.


-- 

schwab at linux-m68k dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|---                         |4.4.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37814