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[Patch 4/17] Implement TARGET_C_EXCESS_PRECISION for m68k 

gcc/

	* config/m68k/m68k.c (m68k_excess_precision): New.
	(TARGET_C_EXCESS_PRECISION): Define.

From-SVN: r242774
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James Greenhalgh 2016-11-23 17:17:35 +00:00 committed by James Greenhalgh
parent 638108bd67
commit b89de1b8dd
2 changed files with 42 additions and 0 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2016-11-23 James Greenhalgh <james.greenhalgh@arm.com>
* config/m68k/m68k.c (m68k_excess_precision): New.
(TARGET_C_EXCESS_PRECISION): Define.
2016-11-23 James Greenhalgh <james.greenhalgh@arm.com>
* config/s390/s390.c (s390_excess_precision): New.

37
gcc/config/m68k/m68k.c
View File

@ -183,6 +183,8 @@ static rtx m68k_function_arg (cumulative_args_t, machine_mode,
static bool m68k_cannot_force_const_mem (machine_mode mode, rtx x);
static bool m68k_output_addr_const_extra (FILE *, rtx);
static void m68k_init_sync_libfuncs (void) ATTRIBUTE_UNUSED;
static enum flt_eval_method
m68k_excess_precision (enum excess_precision_type);
/* Initialize the GCC target structure. */
@ -323,6 +325,9 @@ static void m68k_init_sync_libfuncs (void) ATTRIBUTE_UNUSED;
#undef TARGET_ASM_OUTPUT_ADDR_CONST_EXTRA
#define TARGET_ASM_OUTPUT_ADDR_CONST_EXTRA m68k_output_addr_const_extra
#undef TARGET_C_EXCESS_PRECISION
#define TARGET_C_EXCESS_PRECISION m68k_excess_precision
/* The value stored by TAS. */
#undef TARGET_ATOMIC_TEST_AND_SET_TRUEVAL
#define TARGET_ATOMIC_TEST_AND_SET_TRUEVAL 128
@ -6534,4 +6539,36 @@ m68k_epilogue_uses (int regno ATTRIBUTE_UNUSED)
== m68k_fk_interrupt_handler));
}
/* Implement TARGET_C_EXCESS_PRECISION.
Set the value of FLT_EVAL_METHOD in float.h. When using 68040 fp
instructions, we get proper intermediate rounding, otherwise we
get extended precision results. */
static enum flt_eval_method
m68k_excess_precision (enum excess_precision_type type)
{
switch (type)
{
case EXCESS_PRECISION_TYPE_FAST:
/* The fastest type to promote to will always be the native type,
whether that occurs with implicit excess precision or
otherwise. */
return FLT_EVAL_METHOD_PROMOTE_TO_FLOAT;
case EXCESS_PRECISION_TYPE_STANDARD:
case EXCESS_PRECISION_TYPE_IMPLICIT:
/* Otherwise, the excess precision we want when we are
in a standards compliant mode, and the implicit precision we
provide can be identical. */
if (TARGET_68040 || ! TARGET_68881)
return FLT_EVAL_METHOD_PROMOTE_TO_FLOAT;
return FLT_EVAL_METHOD_PROMOTE_TO_LONG_DOUBLE;
default:
gcc_unreachable ();
}
return FLT_EVAL_METHOD_UNPREDICTABLE;
}
#include "gt-m68k.h"