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i386.c (distance_agu_use_in_bb): Proper initialization of 'prev' var to get better distance estimation. 

* config/i386/i386.c (distance_agu_use_in_bb) : Proper initialization
  of 'prev' var to get better distance estimation.

From-SVN: r202649
This commit is contained in:
Yuri Rumyantsev 2013-09-17 12:01:28 +00:00 committed by Kirill Yukhin
parent dff717d29b
commit 9a0ac98faf
2 changed files with 16 additions and 1 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2013-09-17 Yuri Rumyantsev <ysrumyan@gmail.com>
* config/i386/i386.c (distance_agu_use_in_bb) : Proper initialization
of 'prev' var to get better distance estimation.
2013-09-17 Eric Botcazou <ebotcazou@adacore.com>
* tree-inline.h (struct copy_body_data): Add transform_parameter.

12
gcc/config/i386/i386.c
View File

@ -17469,13 +17469,23 @@ distance_agu_use_in_bb (unsigned int regno,
rtx insn, int distance, rtx start,
bool *found, bool *redefined)
{
basic_block bb = start ? BLOCK_FOR_INSN (start) : NULL;
basic_block bb = NULL;
rtx next = start;
rtx prev = NULL;
*found = false;
*redefined = false;
if (start != NULL_RTX)
{
bb = BLOCK_FOR_INSN (start);
if (start != BB_HEAD (bb))
/* If insn and start belong to the same bb, set prev to insn,
so the call to increase_distance will increase the distance
between insns by 1. */
prev = insn;
}
while (next
&& next != insn
&& distance < LEA_SEARCH_THRESHOLD)