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unroll.c (loop_iterations): If we cannot prove iteration variable is set once in each iteration, punt.

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* unroll.c (loop_iterations): If we cannot prove iteration variable
	is set once in each iteration, punt.

From-SVN: r38996
This commit is contained in:
Jakub Jelinek 2001-01-13 22:54:10 +01:00 committed by Jakub Jelinek
parent 63eaee7147
commit 9e2adb2a1c
2 changed files with 20 additions and 0 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2001-01-13 Jakub Jelinek <jakub@redhat.com>
* unroll.c (loop_iterations): If we cannot prove iteration variable
is set once in each iteration, punt.
Sun Jan 14 00:23:15 2001 Denis Chertykov <denisc@overta.ru>
* config/avr/avr.md ("strlenhi"): Remove clobber of input address.

15
gcc/unroll.c
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@ -3577,6 +3577,13 @@ loop_iterations (loop)
/* Grab initial value, only useful if it is a constant. */
bl = REG_IV_CLASS (ivs, REGNO (iteration_var));
initial_value = bl->initial_value;
if (!bl->biv->always_executed || bl->biv->maybe_multiple)
{
if (loop_dump_stream)
fprintf (loop_dump_stream,
"Loop iterations: Basic induction var not set once in each iteration.\n");
return 0;
}
increment = biv_total_increment (bl);
}
@ -3589,6 +3596,14 @@ loop_iterations (loop)
if (REGNO (v->src_reg) >= ivs->n_regs)
abort ();
if (!v->always_executed || v->maybe_multiple)
{
if (loop_dump_stream)
fprintf (loop_dump_stream,
"Loop iterations: General induction var not set once in each iteration.\n");
return 0;
}
bl = REG_IV_CLASS (ivs, REGNO (v->src_reg));
/* Increment value is mult_val times the increment value of the biv. */