diff options
Diffstat (limited to 'contrib/gcc/convert.c')
| -rw-r--r-- | contrib/gcc/convert.c | 222 |
1 files changed, 203 insertions, 19 deletions
diff --git a/contrib/gcc/convert.c b/contrib/gcc/convert.c index e440e35..9096541 100644 --- a/contrib/gcc/convert.c +++ b/contrib/gcc/convert.c @@ -1,6 +1,6 @@ -/* Utility routines for data type conversion for GNU C. - Copyright (C) 1987, 1988, 1991, 1992, 1993, 1994, 1995, 1997, - 1998 Free Software Foundation, Inc. +/* Utility routines for data type conversion for GCC. + Copyright (C) 1987, 1988, 1991, 1992, 1993, 1994, 1995, 1997, 1998, + 2000, 2001, 2002, 2003 Free Software Foundation, Inc. This file is part of GCC. @@ -25,20 +25,21 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA #include "config.h" #include "system.h" +#include "coretypes.h" +#include "tm.h" #include "tree.h" #include "flags.h" #include "convert.h" #include "toplev.h" #include "langhooks.h" - +#include "real.h" /* Convert EXPR to some pointer or reference type TYPE. EXPR must be pointer, reference, integer, enumeral, or literal zero; in other cases error is called. */ tree -convert_to_pointer (type, expr) - tree type, expr; +convert_to_pointer (tree type, tree expr) { if (integer_zerop (expr)) { @@ -71,15 +72,179 @@ convert_to_pointer (type, expr) } } +/* Avoid any floating point extensions from EXP. */ +tree +strip_float_extensions (tree exp) +{ + tree sub, expt, subt; + + /* For floating point constant look up the narrowest type that can hold + it properly and handle it like (type)(narrowest_type)constant. + This way we can optimize for instance a=a*2.0 where "a" is float + but 2.0 is double constant. */ + if (TREE_CODE (exp) == REAL_CST) + { + REAL_VALUE_TYPE orig; + tree type = NULL; + + orig = TREE_REAL_CST (exp); + if (TYPE_PRECISION (TREE_TYPE (exp)) > TYPE_PRECISION (float_type_node) + && exact_real_truncate (TYPE_MODE (float_type_node), &orig)) + type = float_type_node; + else if (TYPE_PRECISION (TREE_TYPE (exp)) + > TYPE_PRECISION (double_type_node) + && exact_real_truncate (TYPE_MODE (double_type_node), &orig)) + type = double_type_node; + if (type) + return build_real (type, real_value_truncate (TYPE_MODE (type), orig)); + } + + if (TREE_CODE (exp) != NOP_EXPR) + return exp; + + sub = TREE_OPERAND (exp, 0); + subt = TREE_TYPE (sub); + expt = TREE_TYPE (exp); + + if (!FLOAT_TYPE_P (subt)) + return exp; + + if (TYPE_PRECISION (subt) > TYPE_PRECISION (expt)) + return exp; + + return strip_float_extensions (sub); +} + + /* Convert EXPR to some floating-point type TYPE. EXPR must be float, integer, or enumeral; in other cases error is called. */ tree -convert_to_real (type, expr) - tree type, expr; +convert_to_real (tree type, tree expr) { + enum built_in_function fcode = builtin_mathfn_code (expr); + tree itype = TREE_TYPE (expr); + + /* Disable until we figure out how to decide whether the functions are + present in runtime. */ + /* Convert (float)sqrt((double)x) where x is float into sqrtf(x) */ + if (optimize + && (fcode == BUILT_IN_SQRT + || fcode == BUILT_IN_SQRTL + || fcode == BUILT_IN_SIN + || fcode == BUILT_IN_SINL + || fcode == BUILT_IN_COS + || fcode == BUILT_IN_COSL + || fcode == BUILT_IN_EXP + || fcode == BUILT_IN_EXPL + || fcode == BUILT_IN_LOG + || fcode == BUILT_IN_LOGL) + && (TYPE_MODE (type) == TYPE_MODE (double_type_node) + || TYPE_MODE (type) == TYPE_MODE (float_type_node))) + { + tree arg0 = strip_float_extensions (TREE_VALUE (TREE_OPERAND (expr, 1))); + tree newtype = type; + + /* We have (outertype)sqrt((innertype)x). Choose the wider mode from + the both as the safe type for operation. */ + if (TYPE_PRECISION (TREE_TYPE (arg0)) > TYPE_PRECISION (type)) + newtype = TREE_TYPE (arg0); + + /* Be careful about integer to fp conversions. + These may overflow still. */ + if (FLOAT_TYPE_P (TREE_TYPE (arg0)) + && TYPE_PRECISION (newtype) < TYPE_PRECISION (itype) + && (TYPE_MODE (newtype) == TYPE_MODE (double_type_node) + || TYPE_MODE (newtype) == TYPE_MODE (float_type_node))) + { + tree arglist; + tree fn = mathfn_built_in (newtype, fcode); + + if (fn) + { + arglist = build_tree_list (NULL_TREE, fold (convert_to_real (newtype, arg0))); + expr = build_function_call_expr (fn, arglist); + if (newtype == type) + return expr; + } + } + } + if (optimize + && (((fcode == BUILT_IN_FLOORL + || fcode == BUILT_IN_CEILL + || fcode == BUILT_IN_ROUND + || fcode == BUILT_IN_TRUNC + || fcode == BUILT_IN_NEARBYINT) + && (TYPE_MODE (type) == TYPE_MODE (double_type_node) + || TYPE_MODE (type) == TYPE_MODE (float_type_node))) + || ((fcode == BUILT_IN_FLOOR + || fcode == BUILT_IN_CEIL + || fcode == BUILT_IN_ROUND + || fcode == BUILT_IN_TRUNC + || fcode == BUILT_IN_NEARBYINT) + && (TYPE_MODE (type) == TYPE_MODE (float_type_node))))) + { + tree fn = mathfn_built_in (type, fcode); + + if (fn) + { + tree arg0 = strip_float_extensions (TREE_VALUE (TREE_OPERAND (expr, + 1))); + tree arglist = build_tree_list (NULL_TREE, + fold (convert_to_real (type, arg0))); + + return build_function_call_expr (fn, arglist); + } + } + + /* Propagate the cast into the operation. */ + if (itype != type && FLOAT_TYPE_P (type)) + switch (TREE_CODE (expr)) + { + /* Convert (float)-x into -(float)x. This is always safe. */ + case ABS_EXPR: + case NEGATE_EXPR: + if (TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (expr))) + return build1 (TREE_CODE (expr), type, + fold (convert_to_real (type, + TREE_OPERAND (expr, 0)))); + break; + /* Convert (outertype)((innertype0)a+(innertype1)b) + into ((newtype)a+(newtype)b) where newtype + is the widest mode from all of these. */ + case PLUS_EXPR: + case MINUS_EXPR: + case MULT_EXPR: + case RDIV_EXPR: + { + tree arg0 = strip_float_extensions (TREE_OPERAND (expr, 0)); + tree arg1 = strip_float_extensions (TREE_OPERAND (expr, 1)); + + if (FLOAT_TYPE_P (TREE_TYPE (arg0)) + && FLOAT_TYPE_P (TREE_TYPE (arg1))) + { + tree newtype = type; + if (TYPE_PRECISION (TREE_TYPE (arg0)) > TYPE_PRECISION (newtype)) + newtype = TREE_TYPE (arg0); + if (TYPE_PRECISION (TREE_TYPE (arg1)) > TYPE_PRECISION (newtype)) + newtype = TREE_TYPE (arg1); + if (TYPE_PRECISION (newtype) < TYPE_PRECISION (itype)) + { + expr = build (TREE_CODE (expr), newtype, + fold (convert_to_real (newtype, arg0)), + fold (convert_to_real (newtype, arg1))); + if (newtype == type) + return expr; + } + } + } + break; + default: + break; + } + switch (TREE_CODE (TREE_TYPE (expr))) { case REAL_TYPE: @@ -117,8 +282,7 @@ convert_to_real (type, expr) not in use in any existing structure. */ tree -convert_to_integer (type, expr) - tree type, expr; +convert_to_integer (tree type, tree expr) { enum tree_code ex_form = TREE_CODE (expr); tree intype = TREE_TYPE (expr); @@ -156,6 +320,7 @@ convert_to_integer (type, expr) if (TREE_CODE_CLASS (ex_form) == '<') { + expr = copy_node (expr); TREE_TYPE (expr) = type; return expr; } @@ -164,6 +329,7 @@ convert_to_integer (type, expr) || ex_form == TRUTH_OR_EXPR || ex_form == TRUTH_ORIF_EXPR || ex_form == TRUTH_XOR_EXPR) { + expr = copy_node (expr); TREE_OPERAND (expr, 0) = convert (type, TREE_OPERAND (expr, 0)); TREE_OPERAND (expr, 1) = convert (type, TREE_OPERAND (expr, 1)); TREE_TYPE (expr) = type; @@ -172,6 +338,7 @@ convert_to_integer (type, expr) else if (ex_form == TRUTH_NOT_EXPR) { + expr = copy_node (expr); TREE_OPERAND (expr, 0) = convert (type, TREE_OPERAND (expr, 0)); TREE_TYPE (expr) = type; return expr; @@ -182,7 +349,27 @@ convert_to_integer (type, expr) we are truncating EXPR. */ else if (outprec >= inprec) - return build1 (NOP_EXPR, type, expr); + { + enum tree_code code; + + /* If the precision of the EXPR's type is K bits and the + destination mode has more bits, and the sign is changing, + it is not safe to use a NOP_EXPR. For example, suppose + that EXPR's type is a 3-bit unsigned integer type, the + TYPE is a 3-bit signed integer type, and the machine mode + for the types is 8-bit QImode. In that case, the + conversion necessitates an explicit sign-extension. In + the signed-to-unsigned case the high-order bits have to + be cleared. */ + if (TREE_UNSIGNED (type) != TREE_UNSIGNED (TREE_TYPE (expr)) + && (TYPE_PRECISION (TREE_TYPE (expr)) + != GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (expr))))) + code = CONVERT_EXPR; + else + code = NOP_EXPR; + + return build1 (code, type, expr); + } /* If TYPE is an enumeral type or a type with a precision less than the number of bits in its mode, do the conversion to the @@ -286,7 +473,6 @@ convert_to_integer (type, expr) case BIT_AND_EXPR: case BIT_IOR_EXPR: case BIT_XOR_EXPR: - case BIT_ANDTC_EXPR: trunc1: { tree arg0 = get_unwidened (TREE_OPERAND (expr, 0), type); @@ -315,7 +501,7 @@ convert_to_integer (type, expr) /* Don't do unsigned arithmetic where signed was wanted, or vice versa. Exception: if both of the original operands were - unsigned then we can safely do the work as unsigned. + unsigned then we can safely do the work as unsigned. Exception: shift operations take their type solely from the first argument. Exception: the LSHIFT_EXPR case above requires that @@ -390,7 +576,7 @@ convert_to_integer (type, expr) /* It is sometimes worthwhile to push the narrowing down through the conditional and never loses. */ return fold (build (COND_EXPR, type, TREE_OPERAND (expr, 0), - convert (type, TREE_OPERAND (expr, 1)), + convert (type, TREE_OPERAND (expr, 1)), convert (type, TREE_OPERAND (expr, 2)))); default: @@ -425,11 +611,10 @@ convert_to_integer (type, expr) /* Convert EXPR to the complex type TYPE in the usual ways. */ tree -convert_to_complex (type, expr) - tree type, expr; +convert_to_complex (tree type, tree expr) { tree subtype = TREE_TYPE (type); - + switch (TREE_CODE (TREE_TYPE (expr))) { case REAL_TYPE: @@ -481,8 +666,7 @@ convert_to_complex (type, expr) /* Convert EXPR to the vector type TYPE in the usual ways. */ tree -convert_to_vector (type, expr) - tree type, expr; +convert_to_vector (tree type, tree expr) { switch (TREE_CODE (TREE_TYPE (expr))) { |
