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* loop.c (strength_reduce): Size reg_map according to reg_iv_type.

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From-SVN: r24910
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J"orn Rennecke 1999-01-29 19:27:51 +00:00 committed by Joern Rennecke
parent 4c7f1c6367
commit 97ec0ad883
2 changed files with 13 additions and 5 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
Sat Jan 30 03:24:37 1999 J"orn Rennecke <amylaar@cygnus.co.uk>
* loop.c (strength_reduce): Size reg_map according to reg_iv_type.
Fri Jan 29 18:26:07 1999 Dave Brolley <brolley@cygnus.com>
* emit-rtl.c (remove_insn): New function.

14
gcc/loop.c
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@ -3666,6 +3666,7 @@ strength_reduce (scan_start, end, loop_top, insn_count,
int threshold = (loop_has_call ? 1 : 2) * (3 + n_non_fixed_regs);
/* Map of pseudo-register replacements. */
rtx *reg_map;
int reg_map_size;
int call_seen;
rtx test;
rtx end_insert_before;
@ -4419,9 +4420,12 @@ strength_reduce (scan_start, end, loop_top, insn_count,
so that "decrement and branch until zero" insn can be used. */
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));
bzero ((char *) reg_map, max_reg_before_loop * sizeof (rtx));
/* Create reg_map to hold substitutions for replaceable giv regs.
Some givs might have been made from biv increments, so look at
reg_iv_type for a suitable size. */
reg_map_size = reg_iv_type->num_elements;
reg_map = (rtx *) alloca (reg_map_size * sizeof (rtx));
bzero ((char *) reg_map, reg_map_size * sizeof (rtx));
/* Examine each iv class for feasibility of strength reduction/induction
variable elimination. */
@ -4962,8 +4966,8 @@ strength_reduce (scan_start, end, loop_top, insn_count,
if (GET_CODE (p) == INSN || GET_CODE (p) == JUMP_INSN
|| GET_CODE (p) == CALL_INSN)
{
replace_regs (PATTERN (p), reg_map, max_reg_before_loop, 0);
replace_regs (REG_NOTES (p), reg_map, max_reg_before_loop, 0);
replace_regs (PATTERN (p), reg_map, reg_map_size, 0);
replace_regs (REG_NOTES (p), reg_map, reg_map_size, 0);
INSN_CODE (p) = -1;
}