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re PR rtl-optimization/63210 (ira does not select the best register compared with gcc 4.8 for ARM THUMB1) 

ChangeLog:
2014-09-24  Zhenqiang Chen  <zhenqiang.chen@arm.com>

	PR rtl-optimization/63210
	* ira-color.c (assign_hard_reg): Ignore conflict cost if the
	HARD_REGNO is not availabe for CONFLICT_A.

testsuite/ChangeLog:
2014-09-24  Zhenqiang Chen  <zhenqiang.chen@arm.com>

	* gcc.target/arm/pr63210.c: New test.

From-SVN: r215540
This commit is contained in:
Zhenqiang Chen 2014-09-24 07:00:55 +00:00 committed by Zhenqiang Chen
parent f704cf4c32
commit 4ef20c29a3
4 changed files with 29 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2014-09-24 Zhenqiang Chen <zhenqiang.chen@arm.com>
PR rtl-optimization/63210
* ira-color.c (assign_hard_reg): Ignore conflict cost if the
HARD_REGNO is not available for CONFLICT_A.
2014-09-23 Andi Kleen <ak@linux.intel.com>
* cgraph.h (symtab_node): Add no_reorder attribute.

8
gcc/ira-color.c
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@ -1709,6 +1709,7 @@ assign_hard_reg (ira_allocno_t a, bool retry_p)
{
ira_allocno_t conflict_a = OBJECT_ALLOCNO (conflict_obj);
enum reg_class conflict_aclass;
allocno_color_data_t data = ALLOCNO_COLOR_DATA (conflict_a);
/* Reload can give another class so we need to check all
allocnos. */
@ -1780,7 +1781,12 @@ assign_hard_reg (ira_allocno_t a, bool retry_p)
hard_regno = ira_class_hard_regs[aclass][j];
ira_assert (hard_regno >= 0);
k = ira_class_hard_reg_index[conflict_aclass][hard_regno];
if (k < 0)
if (k < 0
/* If HARD_REGNO is not available for CONFLICT_A,
the conflict would be ignored, since HARD_REGNO
will never be assigned to CONFLICT_A. */
|| !TEST_HARD_REG_BIT (data->profitable_hard_regs,
hard_regno))
continue;
full_costs[j] -= conflict_costs[k];
}

4
gcc/testsuite/ChangeLog
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@ -1,3 +1,7 @@
2014-09-24 Zhenqiang Chen <zhenqiang.chen@arm.com>
* gcc.target/arm/pr63210.c: New test.
2014-09-23 Andi Kleen <ak@linux.intel.com>
* gcc.dg/noreorder.c: New test.

12
gcc/testsuite/gcc.target/arm/pr63210.c Normal file
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@ -0,0 +1,12 @@
/* { dg-do assemble } */
/* { dg-options "-mthumb -Os " } */
/* { dg-require-effective-target arm_thumb1_ok } */
int foo1 (int c);
int foo2 (int c);
int test (int c)
{
return (foo1 (c) || foo2 (c));
}
/* { dg-final { object-size text <= 28 } } */