0f996086cb
* ginclude/stdfix.h: New file. * Makefile.in (USER_H): Add $(srcdir)/ginclude/stdfix.h. (convert.o): Add dependence on fixed-value.h. * c-convert.c (convert): Support FIXED_POINT_TYPE. * c-cppbuiltin.c (builtin_define_fixed_point_constants): New function to define fixed-point constants. (c_cpp_builtins): Define fixed-point constants. * convert.c (fixed-value.h): New include. (convert_to_real): Update comment to include fixed-point. Support FIXED_POINT_TYPE. (convert_to_integer): Update comment to include fixed-point. Support FIXED_POINT_TYPE. (convert_to_complex): Support FIXED_POINT_TYPE. (convert_to_fixed): New function. * convert.h (convert_to_fixed): Declare. * genopinit.c: Add comment about $Q for only fixed-point modes. (optabs): Add fract_optab, fractuns_optab, satfract_optab, satfractuns_optab, add_optab, ssadd_optab, usadd_optab, sub_optab, sssub_optab, ussub_optab, smul_optab, ssmul_optab, usmul_optab, ssmadd_widen_optab, usmadd_widen_optab, ssdiv_optab, udiv_optab, usdiv_optab, ssashl_optab, usashl_optab, neg_optab, ssneg_optab, usneg_optab for fixed-point modes. (gen_insn): Add force_fixed to track the $Q format for all fixed-point modes. * optabs.c (optab_for_tree_code): For *DIV_EXPR, LSHIFT_EXPR, PLUS_EXPR, MINUS_EXPR, MULT_EXPR, NEGATE_EXPR, return signed or unsigned saturation optabs, when type is saturating. (shift_optab_p): Return true for SS_ASHIFT or US_ASHIFT. (expand_fixed_convert): New function. (gen_fixed_libfunc, gen_signed_fixed_libfunc, gen_unsigned_fixed_libfunc, gen_int_fp_fixed_libfunc, gen_int_fp_signed_fixed_libfunc, gen_int_fixed_libfunc, gen_int_signed_fixed_libfunc, gen_int_unsigned_fixed_libfunc, gen_fract_conv_libfunc, gen_fractuns_conv_libfunc, gen_satfract_conv_libfunc, gen_satfractuns_conv_libfunc): New functions. (init_optabs): Initialize ssadd_optab, usadd_optab, sssub_optab, ussub_optab, ssmul_optab, usmul_optab, ssmadd_widen_optab, usmadd_widen_optab, ssmsub_widen_optab, usmsub_widen_optab, ssdiv_optab, usdiv_optab, ssashl_optab, usashl_optab, ssneg_optab, usneg_optab, fract_optab, fractuns_optab, satfract_optab, satfractuns_optab. Initialize fixed-point libraries, including add, ssadd, usadd, sub, sssub, ussub, mul, ssmul, usmul, div, ssdiv, udiv, usdiv, ashl, ssashl, usashl, ashr, lshr, neg, ssneg, usneg, cmp, fract, satfract, fractuns, satfractuns. * optabs.h (enum optab_index): Add OTI_ssadd, OTI_usadd, OTI_sssub, OTI_ussub, OTI_ssmul, OTI_usmul, OTI_ssdiv, OTI_usdiv, OTI_ssneg, OTI_usneg, OTI_ssashl, OTI_usashl, OTI_ssmadd_widen, OTI_usmadd_widen, OTI_ssmsub_widen, OTI_usmsub_widen. (ssadd_optab, usadd_optab, sssub_optab, ussub_optab, ssmul_optab, usmul_optab, ssdiv_optab, usdiv_optab, ssneg_optab, usneg_optab, ssashl_optab, usashl_optab, ssmadd_widen_optab, usmadd_widen_optab, umsub_widen_optab, usmsub_widen_optab): Define. (enum convert_optab_index): Add COI_fract, COI_fractuns, COI_satfract, COI_satfractuns. (fract_optab, fractuns_optab, satfract_optab, satfractuns_optab): Define. (expand_fixed_convert): Declare. * expr.c (convert_move): Support the move of fixed-point modes. (emit_move_insn_1): Handle fixed-point mode to move via integer. (categorize_ctor_elements_1): Handle FIXED_CST. (count_type_elements): Handle FIXED_POINT_TYPE. (expand_expr_real_1): For VECTOR_CST, check MODE_VECTOR_FRACT, MODE_VECTOR_UFRACT, MODE_VECTOR_ACCUM, MODE_VECTOR_UACCUM. Support FIXED_CST. For PLUS_EXPR and MINUS_EXPR, support saturating and non-saturating multiply and add/subtract for fixed-point types. For MULT_EXPR, *DIV_EXPR, *SHIFT_EXPR, if the mode if a fixed-point mode, we jump to binop directly. Support FIXED_CONVERT_EXPR. (do_store_flag): Check FIXED_CST to put a constant second. (vector_mode_valid_p): Handle MODE_VECTOR_FRACT, MODE_VECTOR_UFRACT, MODE_VECTOR_ACCUM, MODE_VECTOR_UACCUM. (const_vector_from_tree): Support FIXED_CST. * doc/extend.texi (Fixed-Point): New node. * doc/md.texi (ssadd, usadd, sssub, ussub, ssmul, usmul, ssdiv, usdiv, ssmadd, usmadd, ssmsub, usmsub, ssashl, usashl, ssneg, usneg, fract, satfract, fractuns, satfractuns): Document them. From-SVN: r128218
121 lines
3.9 KiB
C
121 lines
3.9 KiB
C
/* Language-level data type conversion for GNU C.
|
||
Copyright (C) 1987, 1988, 1991, 1998, 2002, 2003, 2004, 2005, 2007
|
||
Free Software Foundation, Inc.
|
||
|
||
This file is part of GCC.
|
||
|
||
GCC is free software; you can redistribute it and/or modify it under
|
||
the terms of the GNU General Public License as published by the Free
|
||
Software Foundation; either version 3, or (at your option) any later
|
||
version.
|
||
|
||
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
|
||
WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
||
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
||
for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with GCC; see the file COPYING3. If not see
|
||
<http://www.gnu.org/licenses/>. */
|
||
|
||
|
||
/* This file contains the functions for converting C expressions
|
||
to different data types. The only entry point is `convert'.
|
||
Every language front end must have a `convert' function
|
||
but what kind of conversions it does will depend on the language. */
|
||
|
||
#include "config.h"
|
||
#include "system.h"
|
||
#include "coretypes.h"
|
||
#include "tm.h"
|
||
#include "tree.h"
|
||
#include "flags.h"
|
||
#include "convert.h"
|
||
#include "c-common.h"
|
||
#include "c-tree.h"
|
||
#include "langhooks.h"
|
||
#include "toplev.h"
|
||
#include "target.h"
|
||
|
||
/* Change of width--truncation and extension of integers or reals--
|
||
is represented with NOP_EXPR. Proper functioning of many things
|
||
assumes that no other conversions can be NOP_EXPRs.
|
||
|
||
Conversion between integer and pointer is represented with CONVERT_EXPR.
|
||
Converting integer to real uses FLOAT_EXPR
|
||
and real to integer uses FIX_TRUNC_EXPR.
|
||
|
||
Here is a list of all the functions that assume that widening and
|
||
narrowing is always done with a NOP_EXPR:
|
||
In convert.c, convert_to_integer.
|
||
In c-typeck.c, build_binary_op (boolean ops), and
|
||
c_common_truthvalue_conversion.
|
||
In expr.c: expand_expr, for operands of a MULT_EXPR.
|
||
In fold-const.c: fold.
|
||
In tree.c: get_narrower and get_unwidened. */
|
||
|
||
/* Subroutines of `convert'. */
|
||
|
||
|
||
|
||
/* Create an expression whose value is that of EXPR,
|
||
converted to type TYPE. The TREE_TYPE of the value
|
||
is always TYPE. This function implements all reasonable
|
||
conversions; callers should filter out those that are
|
||
not permitted by the language being compiled. */
|
||
|
||
tree
|
||
convert (tree type, tree expr)
|
||
{
|
||
tree e = expr;
|
||
enum tree_code code = TREE_CODE (type);
|
||
const char *invalid_conv_diag;
|
||
|
||
if (type == error_mark_node
|
||
|| expr == error_mark_node
|
||
|| TREE_TYPE (expr) == error_mark_node)
|
||
return error_mark_node;
|
||
|
||
if ((invalid_conv_diag
|
||
= targetm.invalid_conversion (TREE_TYPE (expr), type)))
|
||
{
|
||
error (invalid_conv_diag);
|
||
return error_mark_node;
|
||
}
|
||
|
||
if (type == TREE_TYPE (expr))
|
||
return expr;
|
||
|
||
if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (expr)))
|
||
return fold_convert (type, expr);
|
||
if (TREE_CODE (TREE_TYPE (expr)) == ERROR_MARK)
|
||
return error_mark_node;
|
||
if (TREE_CODE (TREE_TYPE (expr)) == VOID_TYPE)
|
||
{
|
||
error ("void value not ignored as it ought to be");
|
||
return error_mark_node;
|
||
}
|
||
if (code == VOID_TYPE)
|
||
return fold_convert (type, e);
|
||
if (code == INTEGER_TYPE || code == ENUMERAL_TYPE)
|
||
return fold (convert_to_integer (type, e));
|
||
if (code == BOOLEAN_TYPE)
|
||
return fold_convert (type, c_objc_common_truthvalue_conversion (expr));
|
||
if (code == POINTER_TYPE || code == REFERENCE_TYPE)
|
||
return fold (convert_to_pointer (type, e));
|
||
if (code == REAL_TYPE)
|
||
return fold (convert_to_real (type, e));
|
||
if (code == FIXED_POINT_TYPE)
|
||
return fold (convert_to_fixed (type, e));
|
||
if (code == COMPLEX_TYPE)
|
||
return fold (convert_to_complex (type, e));
|
||
if (code == VECTOR_TYPE)
|
||
return fold (convert_to_vector (type, e));
|
||
if ((code == RECORD_TYPE || code == UNION_TYPE)
|
||
&& lang_hooks.types_compatible_p (type, TREE_TYPE (expr)))
|
||
return e;
|
||
|
||
error ("conversion to non-scalar type requested");
|
||
return error_mark_node;
|
||
}
|