/*
- decimal.c
-
- conversions and numerical operations for the c# type System.Decimal
-
- Author: Martin Weindel (martin.weindel@t-online.de)
-
- (C) 2001 by Martin Weindel
-*/
+ * decimal.c
+ *
+ * conversions and numerical operations for the c# type System.Decimal
+ *
+ * Author: Martin Weindel (martin.weindel@t-online.de)
+ *
+ * (C) 2001 by Martin Weindel
+ */
/*
* machine dependent configuration for
*pchi >>= 1;
}
+#if defined(__native_client__) && (defined(__i386__) || defined(__x86_64))
+#define USE_X86_32BIT_INSTRUCTIONS 1
+#endif
+
static inline gint
my_g_bit_nth_msf (gsize mask)
{
/* Mask is expected to be != 0 */
-#if defined(__i386__) && defined(__GNUC__)
+#if (defined(__i386__) && defined(__GNUC__)) || defined(USE_X86_32BIT_INSTRUCTIONS)
int r;
__asm__("bsrl %1,%0\n\t"
if (_BitScanReverse64 (&bIndex, mask))
return bIndex;
return -1;
+#elif defined(__s390x__) && defined(__NOT_YET)
+ guint64 r;
+
+ __asm__("\tlrvgr\t%1,%1\n"
+ "\tflogr\t%0,%1\n"
+ "\tjz\t0f\n"
+ "\tlghi\t%0,-1\n"
+ "0:\n"
+ : "=r" (r) : "r" (mask) : "cc");
#else
int i;
return normalize128(pclo, pchi, pScale, roundFlag, roundBit);
}
+guint32 rest;
+static void trimExcessScale(guint64* pclo, guint64* pchi, int* pScale)
+{
+ guint64 ilo = *pclo, lastlo;
+ guint64 ihi = *pchi, lasthi;
+ int scale = *pScale;
+ int i = 0, roundBit;
+
+ while (scale > 0) {
+ scale--;
+ i++;
+ lastlo = ilo;
+ lasthi = ihi;
+
+ roundBit = div128by32(&ilo, &ihi, 10, &rest);
+ if (rest != 0){
+ i--;
+ if (i == 0)
+ return;
+
+ *pclo = lastlo;
+ *pchi = lasthi;
+ *pScale = scale+1;
+ return;
+ }
+ }
+}
+
/* performs a += b */
gint32 mono_decimalIncr(/*[In, Out]*/decimal_repr* pA, /*[In]*/decimal_repr* pB)
{
PRECONDITION(digits <= 15);
sign = ((*p & LIT_GUINT64_HIGHBIT) != 0) ? 1 : 0;
+
+ // Exponent
k = ((guint16)((*p) >> 52)) & 0x7FF;
+
+ // 1-bit followed by the fraction component from the float
alo = (*p & LIT_GUINT64(0xFFFFFFFFFFFFF)) | LIT_GUINT64(0x10000000000000);
ahi = 0;
}
scale = 0;
- rc = rescale128(&alo, &ahi, &scale, -texp, 0, DECIMAL_MAX_SCALE, 0);
+ rc = rescale128(&alo, &ahi, &scale, -texp, 0, DECIMAL_MAX_SCALE, 1);
if (rc != DECIMAL_SUCCESS) return rc;
sigDigits = calcDigits(alo, ahi);
}
}
+ //
+ // Turn the double 0.6 which at this point is:
+ // 0.6000000000000000
+ // into:
+ // 0.6
+ //
+ trimExcessScale (&alo, &ahi, &scale);
+
return pack128toDecimal(pA, alo, ahi, scale, sign);
}
}
}
+ // Set correct scale for zeros decimal (000 input is 0.00)
+ if (sigLen < 0 && len > decrDecimal)
+ sigLen = len;
+
scale = sigLen - decrDecimal;
if (i < len) { /* too much digits, we must round */
if (rc != DECIMAL_SUCCESS) return rc;
}
- if (alo == 0 && ahi == 0) {
- DECINIT(pA);
+ if (alo == 0 && ahi == 0 && scale <= 0) {
return DECIMAL_SUCCESS;
} else {
return pack128toDecimal(pA, alo, ahi, sigLen - decrDecimal, sign);
}
}
-/**
- * mono_decimal2string:
- * @
- * returns minimal number of digit string to represent decimal
- * No leading or trailing zeros !
- * Examples:
- * *pA == 0 => buf = "", *pDecPos = 1, *pSign = 0
- * *pA == 12.34 => buf = "1234", *pDecPos = 2, *pSign = 0
- * *pA == -1000.0000 => buf = "1", *pDecPos = 4, *pSign = 1
- * *pA == -0.00000076 => buf = "76", *pDecPos = -6, *pSign = 0
- *
- * Parameters:
- * pA decimal instance to convert
- * digits < 0: use decimals instead
- * = 0: gets mantisse as integer
- * > 0: gets at most <digits> digits, rounded according to banker's rule if necessary
- * decimals only used if digits < 0
- * >= 0: number of decimal places
- * buf pointer to result buffer
- * bufSize size of buffer
- * pDecPos receives insert position of decimal point relative to start of buffer
- * pSign receives sign
- */
-gint32 mono_decimal2string(/*[In]*/decimal_repr* pA, gint32 digits, gint32 decimals,
- MonoArray* pArray, gint32 bufSize, gint32* pDecPos, gint32* pSign)
-{
- guint16 tmp[41];
- guint16 *buf = (guint16*) mono_array_addr(pArray, guint16, 0);
- guint16 *q, *p = tmp;
- decimal_repr aa;
- guint64 alo, ahi;
- guint32 rest;
- gint32 sigDigits, d;
- int i, scale, len;
-
- MONO_ARCH_SAVE_REGS;
-
- scale = pA->signscale.scale;
- DECTO128(pA, alo, ahi);
- sigDigits = calcDigits(alo, ahi); /* significant digits */
-
- /* calc needed digits (without leading or trailing zeros) */
- d = (digits == 0) ? sigDigits : digits;
- if (d < 0) { /* use decimals ? */
- if (0 <= decimals && decimals < scale) {
- d = sigDigits - scale + decimals;
- } else {
- d = sigDigits; /* use all you can get */
- }
- }
-
- if (sigDigits > d) { /* we need to round decimal number */
- DECCOPY(&aa, pA);
- aa.signscale.scale = DECIMAL_MAX_SCALE;
- mono_decimalRound(&aa, DECIMAL_MAX_SCALE - sigDigits + d);
- DECTO128(&aa, alo, ahi);
- sigDigits += calcDigits(alo, ahi) - d;
- }
-
- len = 0;
- if (d > 0) {
- /* get digits starting from the tail */
- for (; (alo != 0 || ahi != 0) && len < 40; len++) {
- div128by32(&alo, &ahi, 10, &rest);
- *p++ = '0' + (char) rest;
- }
- }
- *p = 0;
-
- if (len >= bufSize) return DECIMAL_BUFFER_OVERFLOW;
-
- /* now we have the minimal count of digits,
- extend to wished count of digits or decimals */
- q = buf;
- if (digits >= 0) { /* count digits */
- if (digits >= bufSize) return DECIMAL_BUFFER_OVERFLOW;
- if (len == 0) {
- /* zero or rounded to zero */
- *pDecPos = 1;
- } else {
- /* copy significant digits */
- for (i = 0; i < len; i++) {
- *q++ = *(--p);
- }
- *pDecPos = sigDigits - scale;
- }
- /* add trailing zeros */
- for (i = len; i < digits; i++) {
- *q++ = '0';
- }
- } else { /* count decimals */
- if (scale >= sigDigits) { /* add leading zeros */
- if (decimals+2 >= bufSize) return DECIMAL_BUFFER_OVERFLOW;
- *pDecPos = 1;
- for (i = 0; i <= scale - sigDigits; i++) {
- *q++ = '0';
- }
- } else {
- if (sigDigits - scale + decimals+1 >= bufSize) return DECIMAL_BUFFER_OVERFLOW;
- *pDecPos = sigDigits - scale;
- }
- /* copy significant digits */
- for (i = 0; i < len; i++) {
- *q++ = *(--p);
- }
- /* add trailing zeros */
- for (i = scale; i < decimals; i++) {
- *q++ = '0';
- }
- }
- *q = 0;
-
- *pSign = (sigDigits > 0) ? pA->signscale.sign : 0; /* zero has positive sign */
-
- return DECIMAL_SUCCESS;
-}
-
/**
* mono_decimal2UInt64:
* @pA
}
#endif /* DISABLE_DECIMAL */
-
projects / mono.git / blobdiff