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loop.c (strength_reduce): Grow set_in_loop / n_times_set / may_not_optimize to proper size when...

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* loop.c (strength_reduce): Grow set_in_loop / n_times_set /
	may_not_optimize to proper size when converting biv increments
	into givs.
	If necessary, reallocate reg_iv_type / reg_iv_info before calling
	recombine_givs.

From-SVN: r24898
This commit is contained in:
J"orn Rennecke 1999-01-28 16:19:58 +00:00 committed by Joern Rennecke
parent 07b1b0304a
commit f56246bec4
2 changed files with 30 additions and 4 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
Fri Jan 29 00:14:55 1999 J"orn Rennecke <amylaar@cygnus.co.uk>
* loop.c (strength_reduce): Grow set_in_loop / n_times_set /
may_not_optimize to proper size when converting biv increments
into givs.
If necessary, reallocate reg_iv_type / reg_iv_info before calling
recombine_givs.
Thu Jan 28 23:24:08 1999 J"orn Rennecke <amylaar@cygnus.co.uk>
* loop.c (recombine_givs): New parameter unroll_p. If set, don't

26
gcc/loop.c
View File

@ -4143,11 +4143,13 @@ strength_reduce (scan_start, end, loop_top, insn_count,
old_reg = v->dest_reg;
dest_reg = gen_reg_rtx (v->mode);
/* Unlike reg_iv_type / reg_iv_info, the other three arrays
have been allocated with some slop space, so we may not
actually need to reallocate them. If we do, the following
if statement will be executed just once in this loop. */
if ((unsigned) max_reg_num () > n_times_set->num_elements)
{
int nregs = max_reg_before_loop + n_extra_increment;
/* Grow all the arrays. */
/* Grow all the remaining arrays. */
VARRAY_GROW (set_in_loop, nregs);
VARRAY_GROW (n_times_set, nregs);
VARRAY_GROW (may_not_optimize, nregs);
@ -4431,6 +4433,7 @@ strength_reduce (scan_start, end, loop_top, insn_count,
int benefit;
int all_reduced;
rtx final_value = 0;
unsigned nregs;
/* Test whether it will be possible to eliminate this biv
provided all givs are reduced. This is possible if either
@ -4582,7 +4585,22 @@ strength_reduce (scan_start, end, loop_top, insn_count,
}
/* Now that we know which givs will be reduced, try to rearrange the
combinations to reduce register pressure. */
combinations to reduce register pressure.
recombine_givs calls find_life_end, which needs reg_iv_type and
reg_iv_info to be valid for all pseudos. We do the necessary
reallocation here since it allows to check if there are still
more bivs to process. */
nregs = max_reg_num ();
if (nregs > reg_iv_type->num_elements)
{
/* If there are still more bivs to process, allocate some slack
space so that we're not constantly reallocating these arrays. */
if (bl->next)
nregs += nregs / 4;
/* Reallocate reg_iv_type and reg_iv_info. */
VARRAY_GROW (reg_iv_type, nregs);
VARRAY_GROW (reg_iv_info, nregs);
}
recombine_givs (bl, loop_start, loop_end, unroll_p);
/* Reduce each giv that we decided to reduce. */