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trans.c: Define FP_ARITH_MAY_WIDEN

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2008-08-22  Geert Bosch  <bosch@adacore.com>

	* gcc-interface/trans.c: Define FP_ARITH_MAY_WIDEN
	(convert_with_check): Only use longest_float_type if FP_ARITH_MAY_WIDEN is 0

From-SVN: r139468
This commit is contained in:
Geert Bosch 2008-08-22 13:29:10 +00:00 committed by Arnaud Charlet
parent 1c7717c3a8
commit 6eca32ba8d
2 changed files with 21 additions and 4 deletions
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5
gcc/ada/ChangeLog
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@ -1,3 +1,8 @@
2008-08-22 Geert Bosch <bosch@adacore.com>
* gcc-interface/trans.c: Define FP_ARITH_MAY_WIDEN
(convert_with_check): Only use longest_float_type if FP_ARITH_MAY_WIDEN is 0
2008-08-22 Doug Rupp <rupp@adacore.com>
* bindgen.adb [VMS] (Gen_Adainit_Ada, Gen_Adainit_C): Import and call

20
gcc/ada/gcc-interface/trans.c
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@ -73,6 +73,19 @@
#define TARGET_ABI_OPEN_VMS 0
#endif
/* For efficient float-to-int rounding, it is necessary to know whether
floating-point arithmetic on may use wider intermediate results.
When FP_ARITH_MAY_WIDEN is not defined, be conservative and only assume
floating-point arithmetic does not widen if double precision is emulated. */
#ifndef FP_ARITH_MAY_WIDEN
#if defined(HAVE_extendsfdf2)
#define FP_ARITH_MAY_WIDEN HAVE_extendsfdf2
#else
#define FP_ARITH_MAY_WIDEN 0
#endif
#endif
extern char *__gnat_to_canonical_file_spec (char *);
int max_gnat_nodes;
@ -6308,12 +6321,11 @@ convert_with_check (Entity_Id gnat_type, tree gnu_expr, bool overflowp,
/* The following calculations depend on proper rounding to even
of each arithmetic operation. In order to prevent excess
precision from spoiling this property, use the widest hardware
floating-point type.
floating-point type if FP_ARITH_MAY_WIDEN is true. */
FIXME: For maximum efficiency, this should only be done for machines
and types where intermediates may have extra precision. */
calc_type = (FP_ARITH_MAY_WIDEN ? longest_float_type_node
: gnu_in_basetype);
calc_type = longest_float_type_node;
/* FIXME: Should not have padding in the first place */
if (TREE_CODE (calc_type) == RECORD_TYPE
&& TYPE_IS_PADDING_P (calc_type))