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(CLASS_LIKELY_SPILLED_P): Add default definition.

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(alloc_qty_for_scratch, local_alloc): Use CLASS_LIKELY_SPILLED_P.

From-SVN: r3319
This commit is contained in:
Richard Kenner 1993-01-24 07:18:57 -05:00
parent f65b79390a
commit cde62d1aec
1 changed files with 15 additions and 4 deletions
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19
gcc/local-alloc.c
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@ -65,6 +65,17 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "recog.h"
#include "output.h"
/* Pseudos allocated here cannot be reallocated by global.c if the hard
register is used as a spill register. So we don't allocate such pseudos
here if their preferred class is likely to be used by spills.
On most machines, the appropriate test is if the class has one
register, so we default to that. */
#ifndef CLASS_LIKELY_SPILLED_P
#define CLASS_LIKELY_SPILLED_P(CLASS) (reg_class_size[(int) (CLASS)] == 1)
#endif
/* Next quantity number available for allocation. */
static int next_qty;
@ -329,11 +340,11 @@ alloc_qty_for_scratch (scratch, n, insn, insn_code_num, insn_number)
break;
}
/* If CLASS has only one register, don't allocate the SCRATCH here since
/* If CLASS has only a few registers, don't allocate the SCRATCH here since
it will prevent that register from being used as a spill register.
reload will do the allocation. */
if (class == NO_REGS || reg_class_size[(int) class] == 1)
if (class == NO_REGS || CLASS_LIKELY_SPILLED_P (class))
return;
#else /* REGISTER_CONSTRAINTS */
@ -411,7 +422,7 @@ local_alloc ()
/* Determine which pseudo-registers can be allocated by local-alloc.
In general, these are the registers used only in a single block and
which only die once. However, if a register's preferred class has only
one entry, don't allocate this register here unless it is preferred
a few entries, don't allocate this register here unless it is preferred
or nothing since retry_global_alloc won't be able to move it to
GENERAL_REGS if a reload register of this class is needed.
@ -422,7 +433,7 @@ local_alloc ()
{
if (reg_basic_block[i] >= 0 && reg_n_deaths[i] == 1
&& (reg_alternate_class (i) == NO_REGS
|| reg_class_size[(int) reg_preferred_class (i)] > 1))
|| ! CLASS_LIKELY_SPILLED_P (reg_preferred_class (i))))
reg_qty[i] = -2;
else
reg_qty[i] = -1;