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* unroll.c (loop_iterations): Handle EQ loops.

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From-SVN: r55111
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Alan Modra 2002-06-30 05:06:01 +00:00 committed by Alan Modra
parent 35aba846c1
commit c8b64bf26d
2 changed files with 41 additions and 6 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
2002-06-30 Alan Modra <amodra@bigpond.net.au>
* unroll.c (loop_iterations): Handle EQ loops.
2002-06-29 David Edelsohn <edelsohn@gnu.org>
* config/rs6000/rs6000.md (ctrdi): Allocate pseudo for FPR

43
gcc/unroll.c
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@ -3941,12 +3941,6 @@ loop_iterations (loop)
}
return 0;
}
else if (comparison_code == EQ)
{
if (loop_dump_stream)
fprintf (loop_dump_stream, "Loop iterations: EQ comparison loop.\n");
return 0;
}
else if (GET_CODE (final_value) != CONST_INT)
{
if (loop_dump_stream)
@ -3958,6 +3952,43 @@ loop_iterations (loop)
}
return 0;
}
else if (comparison_code == EQ)
{
rtx inc_once;
if (loop_dump_stream)
fprintf (loop_dump_stream, "Loop iterations: EQ comparison loop.\n");
inc_once = gen_int_mode (INTVAL (initial_value) + INTVAL (increment),
GET_MODE (iteration_var));
if (inc_once == final_value)
{
/* The iterator value once through the loop is equal to the
comparision value. Either we have an infinite loop, or
we'll loop twice. */
if (increment == const0_rtx)
return 0;
loop_info->n_iterations = 2;
}
else
loop_info->n_iterations = 1;
if (GET_CODE (loop_info->initial_value) == CONST_INT)
loop_info->final_value
= gen_int_mode ((INTVAL (loop_info->initial_value)
+ loop_info->n_iterations * INTVAL (increment)),
GET_MODE (iteration_var));
else
loop_info->final_value
= plus_constant (loop_info->initial_value,
loop_info->n_iterations * INTVAL (increment));
loop_info->final_equiv_value
= gen_int_mode ((INTVAL (initial_value)
+ loop_info->n_iterations * INTVAL (increment)),
GET_MODE (iteration_var));
return loop_info->n_iterations;
}
/* Final_larger is 1 if final larger, 0 if they are equal, otherwise -1. */
if (unsigned_p)