-/****i* strcalc/implementation
- *
- * AUTHORS
- * Matthias Heil
- *
- * NOTES
- ******/
+/*
+ * Project: libFIRM
+ * File name: ir/tv/strcalc.c
+ * Purpose:
+ * Author: Mathias Heil
+ * Modified by:
+ * Created:
+ * CVS-ID: $Id$
+ * Copyright: (c) 2003 Universität Karlsruhe
+ * Licence: This file protected by GPL - GNU GENERAL PUBLIC LICENSE.
+ */
+
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
#include "strcalc.h"
#include <stdlib.h>
+#ifdef HAVE_ALLOCA_H
+# include <alloca.h>
+#endif
+#ifdef HAVE_MALLOC_H
+# include <malloc.h>
+#endif
#include <assert.h> /* assertions */
#include <string.h> /* memset/memcmp */
#include <stdio.h> /* output for error messages */
/*
* local definitions and macros
*/
-#define CLEAR_CALC_BUFFER() assert(calc_buffer); memset(calc_buffer, SC_0, CALC_BUFFER_SIZE)
+#define CLEAR_BUFFER(b) assert(b); memset(b, SC_0, CALC_BUFFER_SIZE)
#define _val(a) ((a)-SC_0)
#define _digit(a) ((a)+SC_0)
#define _bitisset(digit, pos) (and_table[_val(digit)][_val(shift_table[pos])] != SC_0)
#define fail_char(a, b, c, d) _fail_char((a), (b), (c), (d), __FILE__, __LINE__)
-#ifdef STRCALC_DEBUG_COMPUTATION
+/* shortcut output for debugging */
+# define sc_print_hex(a) sc_print((a), 0, SC_HEX)
+# define sc_print_dec(a) sc_print((a), 0, SC_DEC)
+# define sc_print_oct(a) sc_print((a), 0, SC_OCT)
+# define sc_print_bin(a) sc_print((a), 0, SC_BIN)
+
+#ifdef STRCALC_DEBUG_PRINTCOMP
# define DEBUGPRINTF_COMPUTATION(x) printf x
#else
# define DEBUGPRINTF_COMPUTATION(x) ((void)0)
buffer[counter] = add2[0];
carry = add_table[_val(add1[1])][_val(add2[1])][0];
}
+ carry_flag = carry != SC_0;
}
static void _mul(const char *val1, const char *val2, char *buffer)
{
- char temp_buffer[CALC_BUFFER_SIZE]; /* result buffer */
- char neg_val1[CALC_BUFFER_SIZE]; /* abs of val1 */
- char neg_val2[CALC_BUFFER_SIZE]; /* abs of val2 */
+ char* temp_buffer; /* result buffer */
+ char* neg_val1; /* abs of val1 */
+ char* neg_val2; /* abs of val2 */
const char *mul, *add1, *add2; /* intermediate result containers */
char carry = SC_0; /* container for carries */
char sign = 0; /* marks result sign */
int c_inner, c_outer; /* loop counters */
+ temp_buffer = alloca(CALC_BUFFER_SIZE);
+ neg_val1 = alloca(CALC_BUFFER_SIZE);
+ neg_val2 = alloca(CALC_BUFFER_SIZE);
+
/* init result buffer to zeroes */
memset(temp_buffer, SC_0, CALC_BUFFER_SIZE);
static void _sub(const char *val1, const char *val2, char *buffer)
{
- char temp_buffer[CALC_BUFFER_SIZE]; /* intermediate buffer to hold -val2 */
+ char *temp_buffer; /* intermediate buffer to hold -val2 */
+ temp_buffer = alloca(CALC_BUFFER_SIZE);
_negate(val2, temp_buffer);
_add(val1, temp_buffer, buffer);
static void _divmod(const char *dividend, const char *divisor, char *quot, char *rem)
{
const char *minus_divisor;
- char neg_val1[CALC_BUFFER_SIZE];
- char neg_val2[CALC_BUFFER_SIZE];
+ char *neg_val1;
+ char *neg_val2;
char sign = 0; /* remember result sign */
int c_dividend; /* loop counters */
+ neg_val1 = alloca(CALC_BUFFER_SIZE);
+ neg_val2 = alloca(CALC_BUFFER_SIZE);
+
/* clear result buffer */
memset(quot, SC_0, CALC_BUFFER_SIZE);
memset(rem, SC_0, CALC_BUFFER_SIZE);
/* if shifting far enough the result is either 0 or -1 */
if (offset >= radius)
{
+ if (!sc_is_zero(val1)) {
+ carry_flag = 1;
+ }
memset(buffer, sign, CALC_BUFFER_SIZE);
return;
}
shift = offset % 4;
offset = offset / 4;
- /* check if any bits are lost, and set carry_flag is so */
+ /* check if any bits are lost, and set carry_flag if so */
for (counter = 0; counter < offset; counter++)
{
- if (val1[counter] != carry_flag)
+ if (val1[counter] != 0)
{
carry_flag = 1;
break;
}
}
- if ((carry_flag == 0) && (_val(val1[counter]) & shift) != 0)
+ if ((_val(val1[counter]) & ((1<<shift)-1)) != 0)
+ {
carry_flag = 1;
-
+ }
/* shift digits to the right with offset, carry and all */
counter = 0;
if (radius/4 - offset > 0) {
/* positive: low-order -> high order, negative other direction */
static void _rot(const char *val1, char *buffer, long offset, int radius, unsigned is_signed)
{
- char temp1[CALC_BUFFER_SIZE];
- char temp2[CALC_BUFFER_SIZE];
+ char *temp1, *temp2;
+ temp1 = alloca(CALC_BUFFER_SIZE);
+ temp2 = alloca(CALC_BUFFER_SIZE);
offset = offset % radius;
}
/* XXX doesn't check for overflows */
-void sc_val_from_str(const char *str, unsigned int len)
+void sc_val_from_str(const char *str, unsigned int len, void *buffer)
{
const char *orig_str = str;
unsigned int orig_len = len;
char sign = 0;
- char base[CALC_BUFFER_SIZE];
- char val[CALC_BUFFER_SIZE];
+ char *base, *val;
+
+ base = alloca(CALC_BUFFER_SIZE);
+ val = alloca(CALC_BUFFER_SIZE);
/* verify valid pointers (not null) */
assert(str);
/* a string no characters long is an error */
assert(len);
- CLEAR_CALC_BUFFER();
+ if (buffer == NULL) buffer = calc_buffer;
+
+ CLEAR_BUFFER(buffer);
memset(base, SC_0, CALC_BUFFER_SIZE);
memset(val, SC_0, CALC_BUFFER_SIZE);
}
}
-void sc_val_from_long(long value)
+void sc_val_from_long(long value, void *buffer)
{
char *pos;
char sign, is_minlong;
- pos = calc_buffer;
+ if (buffer == NULL) buffer = calc_buffer;
+ pos = buffer;
+
sign = (value < 0);
is_minlong = value == LONG_MIN;
value = -value;
}
- CLEAR_CALC_BUFFER();
+ CLEAR_BUFFER(buffer);
- while ((value != 0) && (pos < calc_buffer + CALC_BUFFER_SIZE))
+ while ((value != 0) && (pos < (char*)buffer + CALC_BUFFER_SIZE))
{
- *pos++ = _digit(value % 16);
- value /= 16;
+ *pos++ = _digit(value & 0xf);
+ value >>= 4;
}
if (sign) {
- if (is_minlong) _inc(calc_buffer, calc_buffer);
- _negate(calc_buffer, calc_buffer);
+ if (is_minlong)
+ _inc(buffer, buffer);
+
+ _negate(buffer, buffer);
+ }
+}
+
+void sc_val_from_ulong(unsigned long value, void *buffer)
+{
+ char *pos;
+
+ if (buffer == NULL) buffer = calc_buffer;
+ pos = buffer;
+
+ while (pos < (char*)buffer + CALC_BUFFER_SIZE)
+ {
+ *pos++ = _digit(value & 0xf);
+ value >>= 4;
}
}
return l;
}
-void sc_min_from_bits(unsigned int num_bits, unsigned int sign)
+void sc_min_from_bits(unsigned int num_bits, unsigned int sign, void *buffer)
{
char* pos;
int i, bits;
- CLEAR_CALC_BUFFER();
+ if (buffer == NULL) buffer = calc_buffer;
+ CLEAR_BUFFER(buffer);
+
if (!sign) return; /* unsigned means minimum is 0(zero) */
- pos = calc_buffer;
+ pos = buffer;
bits = num_bits - 1;
for (i = 0; i < bits/4; i++)
*pos++ = SC_F;
}
-void sc_max_from_bits(unsigned int num_bits, unsigned int sign)
+void sc_max_from_bits(unsigned int num_bits, unsigned int sign, void *buffer)
{
char* pos;
int i, bits;
- CLEAR_CALC_BUFFER();
- pos = calc_buffer;
+ if (buffer == NULL) buffer = calc_buffer;
+ CLEAR_BUFFER(buffer);
+ pos = buffer;
bits = num_bits - sign;
for (i = 0; i < bits/4; i++)
*pos++ = SC_0;
}
-void sc_calc(const void* value1, const void* value2, unsigned op)
+void sc_calc(const void* value1, const void* value2, unsigned op, void *buffer)
{
- char unused_res[CALC_BUFFER_SIZE]; /* temp buffer holding unused result of divmod */
+ char *unused_res; /* temp buffer holding unused result of divmod */
const char *val1 = (const char *)value1;
const char *val2 = (const char *)value2;
- CLEAR_CALC_BUFFER();
+
+ unused_res = alloca(CALC_BUFFER_SIZE);
+ CLEAR_BUFFER(calc_buffer);
carry_flag = 0;
DEBUGPRINTF_COMPUTATION(("%s ", sc_print_hex(value1)));
case SC_NEG:
_negate(val1, calc_buffer);
DEBUGPRINTF_COMPUTATION(("negated: %s\n", sc_print_hex(calc_buffer)));
- return;
+ break;
case SC_OR:
DEBUGPRINTF_COMPUTATION(("| "));
_bitor(val1, val2, calc_buffer);
case SC_NOT:
_bitnot(val1, calc_buffer);
DEBUGPRINTF_COMPUTATION(("bit-negated: %s\n", sc_print_hex(calc_buffer)));
- return;
+ break;
case SC_ADD:
DEBUGPRINTF_COMPUTATION(("+ "));
_add(val1, val2, calc_buffer);
}
DEBUGPRINTF_COMPUTATION(("%s -> ", sc_print_hex(value2)));
DEBUGPRINTF_COMPUTATION(("%s\n", sc_print_hex(calc_buffer)));
+
+ if ((buffer != NULL) && (buffer != calc_buffer))
+ {
+ memcpy(buffer, calc_buffer, CALC_BUFFER_SIZE);
+ }
}
-void sc_bitcalc(const void* value1, const void* value2, int radius, int sign, unsigned op)
+void sc_bitcalc(const void* value1, const void* value2, int radius, int sign, unsigned op, void* buffer)
{
const char *val1 = (const char *)value1;
const char *val2 = (const char *)value2;
switch (op)
{
case SC_SHL:
- DEBUGPRINTF_COMPUTATION(("<< %d ", offset));
+ DEBUGPRINTF_COMPUTATION(("<< %ld ", offset));
_shl(val1, calc_buffer, offset, radius, sign);
break;
case SC_SHR:
- DEBUGPRINTF_COMPUTATION((">> %d ", offset));
+ DEBUGPRINTF_COMPUTATION((">> %ld ", offset));
_shr(val1, calc_buffer, offset, radius, sign, 0);
break;
case SC_SHRS:
- DEBUGPRINTF_COMPUTATION((">>> %d ", offset));
+ DEBUGPRINTF_COMPUTATION((">>> %ld ", offset));
_shr(val1, calc_buffer, offset, radius, sign, 1);
break;
case SC_ROT:
- DEBUGPRINTF_COMPUTATION(("<<>> %d ", offset));
+ DEBUGPRINTF_COMPUTATION(("<<>> %ld ", offset));
_rot(val1, calc_buffer, offset, radius, sign);
break;
default:
assert(0);
}
DEBUGPRINTF_COMPUTATION(("-> %s\n", sc_print_hex(calc_buffer)));
+
+ if ((buffer != NULL) && (buffer != calc_buffer))
+ {
+ memmove(buffer, calc_buffer, CALC_BUFFER_SIZE);
+ }
}
int sc_comp(const void* value1, const void* value2)
const char *val = (const char*)value;
int high, counter;
- high = CALC_BUFFER_SIZE * 4;
+ high = CALC_BUFFER_SIZE * 4 - 1;
for (counter = CALC_BUFFER_SIZE-1; counter >= 0; counter--) {
if (val[counter] == SC_0) high -= 4;
else return low + 3;
}
}
- return low;
+ return -1;
}
int sc_is_zero(const void *value)
/*
* convert to a string
+ * XXX Doesn't check buffer bounds
*/
const char *sc_print(const void *value, unsigned bits, enum base_t base)
{
static const char big_digits[] = "0123456789ABCDEF";
static const char small_digits[] = "0123456789abcdef";
- char base_val[CALC_BUFFER_SIZE];
- char div1_res[CALC_BUFFER_SIZE];
- char div2_res[CALC_BUFFER_SIZE];
- char rem_res[CALC_BUFFER_SIZE];
+ char *base_val, *div1_res, *div2_res, *rem_res;
int counter, nibbles, i, sign;
char x;
char *pos;
const char *digits = small_digits;
- pos = output_buffer + BIT_PATTERN_SIZE ;
- *pos = '\0';
+ base_val = alloca(CALC_BUFFER_SIZE);
+ div1_res = alloca(CALC_BUFFER_SIZE);
+ div2_res = alloca(CALC_BUFFER_SIZE);
+ rem_res = alloca(CALC_BUFFER_SIZE);
+
+ pos = output_buffer + BIT_PATTERN_SIZE;
+ *(--pos) = '\0';
/* special case */
if (bits == 0) {
break;
default:
+ printf("%i\n", base);
assert(0);
return NULL;
}
return pos;
}
-void init_strcalc(int precision_in_bytes)
+void init_strcalc(int precision)
{
if (calc_buffer == NULL) {
- if (precision_in_bytes <= 0) precision_in_bytes = DEFAULT_PRECISION_IN_BYTES;
+ if (precision <= 0) precision = SC_DEFAULT_PRECISION;
- BIT_PATTERN_SIZE = (8 * precision_in_bytes);
- CALC_BUFFER_SIZE = (4 * precision_in_bytes);
- MAX_VALUE_SIZE = (2 * precision_in_bytes);
+ /* round up to multiple of 4 */
+ precision = (precision + 3) & ~3;
- calc_buffer = malloc(CALC_BUFFER_SIZE+1 * sizeof(char));
+ BIT_PATTERN_SIZE = (precision);
+ CALC_BUFFER_SIZE = (precision / 2);
+ MAX_VALUE_SIZE = (precision / 4);
+
+ calc_buffer = malloc(CALC_BUFFER_SIZE+1 * sizeof(char));
output_buffer = malloc(BIT_PATTERN_SIZE+1 * sizeof(char));
- if (calc_buffer == NULL || output_buffer == NULL)
- {
+ if (calc_buffer == NULL || output_buffer == NULL) {
assert(0 && "malloc failed");
exit(-1);
}
- DEBUGPRINTF(("init strcalc: \n\tPRECISION: %d\n\tCALC_BUFFER_SIZE = %d\n\tMAX_VALUE_SIZE = %d\n\tbuffer pointer: %p\n", precision_in_bytes, CALC_BUFFER_SIZE, MAX_VALUE_SIZE, calc_buffer));
+ DEBUGPRINTF(("init strcalc: \n\tPRECISION: %d\n\tCALC_BUFFER_SIZE = %d\n\tMAX_VALUE_SIZE = %d\n\tbuffer pointer: %p\n", precision, CALC_BUFFER_SIZE, MAX_VALUE_SIZE, calc_buffer));
}
}
-int get_precision()
+
+
+void finish_strcalc() {
+ free(calc_buffer); calc_buffer = NULL;
+ free(output_buffer); output_buffer = NULL;
+}
+
+int sc_get_precision(void)
{
- return CALC_BUFFER_SIZE/4;
+ return BIT_PATTERN_SIZE;
}
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