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[script] Speed up floating-point scanner

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Hard-code frequent exponents to reduce number of calls to pow().
This commit is contained in:
Chris Wilson 2009-05-26 08:53:45 +01:00
parent c5e85835b2
commit 247e76b923
1 changed files with 31 additions and 14 deletions
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45
util/cairo-script/cairo-script-scanner.c
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@ -214,32 +214,32 @@ parse_number (csi_object_t *obj, const char *s, int len)
while (++s < end) {
if (*s < '0') {
if (*s == '.') {
if (radix)
if (_csi_unlikely (radix))
return FALSE;
if (decimal != -1)
if (_csi_unlikely (decimal != -1))
return FALSE;
if (exponent_sign)
if (_csi_unlikely (exponent_sign))
return FALSE;
decimal = 0;
} else if (*s == '!') {
if (radix)
if (_csi_unlikely (radix))
return FALSE;
if (decimal != -1)
if (_csi_unlikely (decimal != -1))
return FALSE;
if (exponent_sign)
if (_csi_unlikely (exponent_sign))
return FALSE;
radix = mantissa;
mantissa = 0;
if (radix < 2 || radix > 36)
if (_csi_unlikely (radix < 2 || radix > 36))
return FALSE;
} else
return FALSE;
} else if (*s <= '9') {
int v = *s - '0';
if (radix && v >= radix)
if (_csi_unlikely (radix && v >= radix))
return FALSE;
if (exponent_sign) {
@ -254,7 +254,7 @@ parse_number (csi_object_t *obj, const char *s, int len)
}
} else if (*s == 'E' || * s== 'e') {
if (radix == 0) {
if (s + 1 == end)
if (_csi_unlikely (s + 1 == end))
return FALSE;
exponent_sign = 1;
@ -266,7 +266,7 @@ parse_number (csi_object_t *obj, const char *s, int len)
} else {
int v = 0xe;
if (v >= radix)
if (_csi_unlikely (v >= radix))
return FALSE;
mantissa = radix * mantissa + v;
@ -276,7 +276,7 @@ parse_number (csi_object_t *obj, const char *s, int len)
} else if (*s <= 'Z') {
int v = *s - 'A' + 0xA;
if (v >= radix)
if (_csi_unlikely (v >= radix))
return FALSE;
mantissa = radix * mantissa + v;
@ -285,7 +285,7 @@ parse_number (csi_object_t *obj, const char *s, int len)
} else if (*s <= 'z') {
int v = *s - 'a' + 0xa;
if (v >= radix)
if (_csi_unlikely (v >= radix))
return FALSE;
mantissa = radix * mantissa + v;
@ -306,8 +306,25 @@ parse_number (csi_object_t *obj, const char *s, int len)
e = exponent * exponent_sign;
if (decimal != -1)
e -= decimal;
if (e != 0)
v *= pow (10, e); /* XXX */
switch (e) {
case -7: v *= 0.0000001; break;
case -6: v *= 0.000001; break;
case -5: v *= 0.00001; break;
case -4: v *= 0.0001; break;
case -3: v *= 0.001; break;
case -2: v *= 0.01; break;
case -1: v *= 0.1; break;
case 0: break;
case 1: v *= 10; break;
case 2: v *= 100; break;
case 3: v *= 1000; break;
case 4: v *= 10000; break;
case 5: v *= 100000; break;
case 6: v *= 1000000; break;
default:
v *= pow (10, e); /* XXX */
break;
}
obj->type = CSI_OBJECT_TYPE_REAL;
obj->datum.real = sign * v;