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[Patch 2/17] Implement TARGET_C_EXCESS_PRECISION for i386

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gcc/
	* config/i386/i386.c (ix86_excess_precision): New.
	(TARGET_C_EXCESS_PRECISION): Define.

From-SVN: r242772
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James Greenhalgh 2016-11-23 17:15:17 +00:00 committed by James Greenhalgh
parent 42e02b207f
commit e97dfd54b7
2 changed files with 45 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/i386/i386.c (ix86_excess_precision): New.
(TARGET_C_EXCESS_PRECISION): Define.
2016-11-23 James Greenhalgh <james.greenhalgh@arm.com>
* target.def (excess_precision): New hook.

40
gcc/config/i386/i386.c
View File

@ -51002,6 +51002,44 @@ ix86_expand_divmod_libfunc (rtx libfunc, machine_mode mode,
*rem_p = rem;
}
/* Set the value of FLT_EVAL_METHOD in float.h. When using only the
FPU, assume that the fpcw is set to extended precision; when using
only SSE, rounding is correct; when using both SSE and the FPU,
the rounding precision is indeterminate, since either may be chosen
apparently at random. */
static enum flt_eval_method
ix86_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_80387)
return FLT_EVAL_METHOD_PROMOTE_TO_FLOAT;
else if (TARGET_MIX_SSE_I387)
return FLT_EVAL_METHOD_UNPREDICTABLE;
else if (!TARGET_SSE_MATH)
return FLT_EVAL_METHOD_PROMOTE_TO_LONG_DOUBLE;
else if (TARGET_SSE2)
return FLT_EVAL_METHOD_PROMOTE_TO_FLOAT;
else
return FLT_EVAL_METHOD_UNPREDICTABLE;
default:
gcc_unreachable ();
}
return FLT_EVAL_METHOD_UNPREDICTABLE;
}
/* Target-specific selftests. */
#if CHECKING_P
@ -51233,6 +51271,8 @@ ix86_run_selftests (void)
#undef TARGET_MD_ASM_ADJUST
#define TARGET_MD_ASM_ADJUST ix86_md_asm_adjust
#undef TARGET_C_EXCESS_PRECISION
#define TARGET_C_EXCESS_PRECISION ix86_excess_precision
#undef TARGET_PROMOTE_PROTOTYPES
#define TARGET_PROMOTE_PROTOTYPES hook_bool_const_tree_true
#undef TARGET_SETUP_INCOMING_VARARGS