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loop.c (check_dbra_loop): New argument loop_info. 

* loop.c (check_dbra_loop): New argument loop_info.  Update fields
        as needed.

From-SVN: r24131
This commit is contained in:
Michael Hayes 1998-12-06 04:19:20 +00:00 committed by Jeff Law
parent 01bdf1bc98
commit 5629b16c01
2 changed files with 18 additions and 3 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
Sun Dec 6 05:16:16 1998 Michael Hayes <m.hayes@elec.canterbury.ac.nz>
* loop.c (check_dbra_loop): New argument loop_info. Update fields
as needed.
Sun Dec 6 03:40:13 PST 1998 Jeff Law (law@cygnus.com)
* version.c: Bump for snapshot.

16
gcc/loop.c
View File

@ -312,7 +312,7 @@ static int basic_induction_var PROTO((rtx, enum machine_mode, rtx, rtx, rtx *, r
static rtx simplify_giv_expr PROTO((rtx, int *));
static int general_induction_var PROTO((rtx, rtx *, rtx *, rtx *, int, int *));
static int consec_sets_giv PROTO((int, rtx, rtx, rtx, rtx *, rtx *));
static int check_dbra_loop PROTO((rtx, int, rtx));
static int check_dbra_loop PROTO((rtx, int, rtx, struct loop_info *));
static rtx express_from_1 PROTO((rtx, rtx, rtx));
static rtx express_from PROTO((struct induction *, struct induction *));
static rtx combine_givs_p PROTO((struct induction *, struct induction *));
@ -4041,7 +4041,7 @@ strength_reduce (scan_start, end, loop_top, insn_count,
/* Try to prove that the loop counter variable (if any) is always
nonnegative; if so, record that fact with a REG_NONNEG note
so that "decrement and branch until zero" insn can be used. */
check_dbra_loop (loop_end, insn_count, loop_start);
check_dbra_loop (loop_end, insn_count, loop_start, loop_info);
/* Create reg_map to hold substitutions for replaceable giv regs. */
reg_map = (rtx *) alloca (max_reg_before_loop * sizeof (rtx));
@ -6634,10 +6634,11 @@ product_cheap_p (a, b)
final_[bg]iv_value. */
static int
check_dbra_loop (loop_end, insn_count, loop_start)
check_dbra_loop (loop_end, insn_count, loop_start, loop_info)
rtx loop_end;
int insn_count;
rtx loop_start;
struct loop_info *loop_info;
{
struct iv_class *bl;
rtx reg;
@ -7065,6 +7066,15 @@ check_dbra_loop (loop_end, insn_count, loop_start)
bl->initial_value = start_value;
bl->biv->add_val = new_add_val;
/* Update loop info. */
loop_info->initial_value = bl->initial_value;
loop_info->initial_equiv_value = bl->initial_value;
loop_info->final_value = const0_rtx;
loop_info->final_equiv_value = const0_rtx;
loop_info->comparison_value = const0_rtx;
loop_info->comparison_code = cmp_code;
loop_info->increment = new_add_val;
/* Inc LABEL_NUSES so that delete_insn will
not delete the label. */
LABEL_NUSES (XEXP (jump_label, 0)) ++;