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Make profitability calculation of RA conflict presentations independent of host compiler type sizes. [PR102147]

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gcc/ChangeLog:

2021-09-24  Vladimir Makarov  <vmakarov@redhat.com>

	PR rtl-optimization/102147
	* ira-build.c (ira_conflict_vector_profitable_p): Make
	profitability calculation independent of host compiler pointer and
	IRA_INT_BITS sizes.
This commit is contained in:
Vladimir N. Makarov 2021-09-24 10:06:45 -04:00
parent 55b3299dcd
commit 51ca050319
1 changed files with 9 additions and 4 deletions
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13
gcc/ira-build.c
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@ -629,7 +629,7 @@ ior_hard_reg_conflicts (ira_allocno_t a, const_hard_reg_set set)
bool
ira_conflict_vector_profitable_p (ira_object_t obj, int num)
{
int nw;
int nbytes;
int max = OBJECT_MAX (obj);
int min = OBJECT_MIN (obj);
@ -638,9 +638,14 @@ ira_conflict_vector_profitable_p (ira_object_t obj, int num)
in allocation. */
return false;
nw = (max - min + IRA_INT_BITS) / IRA_INT_BITS;
return (2 * sizeof (ira_object_t) * (num + 1)
< 3 * nw * sizeof (IRA_INT_TYPE));
nbytes = (max - min) / 8 + 1;
STATIC_ASSERT (sizeof (ira_object_t) <= 8);
/* Don't use sizeof (ira_object_t), use constant 8. Size of ira_object_t (a
pointer) is different on 32-bit and 64-bit targets. Usage sizeof
(ira_object_t) can result in different code generation by GCC built as 32-
and 64-bit program. In any case the profitability is just an estimation
and border cases are rare. */
return (2 * 8 /* sizeof (ira_object_t) */ * (num + 1) < 3 * nbytes);
}
/* Allocates and initialize the conflict vector of OBJ for NUM