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cppexp.c (interpret_number): Optimize for single-digit and less-than-half-precision cases.

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* cppexp.c (interpret_number): Optimize for single-digit
	and less-than-half-precision cases.
	(num_trim, num_positive, num_div_op): Cast constants.

From-SVN: r53943
This commit is contained in:
Neil Booth 2002-05-28 05:44:06 +00:00 committed by Neil Booth
parent ee4586c531
commit 359b0bece1
2 changed files with 57 additions and 21 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2002-05-28 Neil Booth <neil@daikokuya.demon.co.uk>
* cppexp.c (interpret_number): Optimize for single-digit
and less-than-half-precision cases.
(num_trim, num_positive, num_div_op): Cast constants.
2002-05-27 Roger Sayle <roger@eyesopen.com>
* c-common.c: Add support for __attribute__((nothrow)) to specify

72
gcc/cppexp.c
View File

@ -176,21 +176,31 @@ interpret_number (pfile, tok)
const cpp_token *tok;
{
cpp_num result;
const uchar *start = tok->val.str.text;
const uchar *end = start + tok->val.str.len;
const uchar *p = start;
cpp_num_part max;
const uchar *p = tok->val.str.text;
const uchar *end;
const struct suffix *sufftab;
size_t precision = CPP_OPTION (pfile, precision);
unsigned int i, nsuff, base = 10, c = 0, largest_digit = 0;
bool overflow = false;
size_t precision;
unsigned int i, nsuff, base, c;
bool overflow, big_digit;
result.low = result.high = 0;
result.low = 0;
result.high = 0;
result.unsignedp = 0;
result.overflow = 0;
/* Common case of a single digit. */
end = p + tok->val.str.len;
if (tok->val.str.len == 1 && (unsigned int) (p[0] - '0') <= 9)
{
result.low = p[0] - '0';
return result;
}
base = 10;
if (p[0] == '0')
{
if (end - start >= 3 && (p[1] == 'x' || p[1] == 'X'))
if (end - p >= 3 && (p[1] == 'x' || p[1] == 'X'))
{
p += 2;
base = 16;
@ -202,6 +212,18 @@ interpret_number (pfile, tok)
}
}
c = 0;
overflow = big_digit = false;
precision = CPP_OPTION (pfile, precision);
/* We can add a digit to numbers less than this without needing
double integers. 9 is the maximum digit for octal and decimal;
for hex it is annihilated by the division anyway. */
max = ~(cpp_num_part) 0;
if (precision < PART_PRECISION)
max >>= PART_PRECISION - precision;
max = (max - 9) / base + 1;
for(; p < end; p++)
{
c = *p;
@ -211,10 +233,18 @@ interpret_number (pfile, tok)
else
break;
result = append_digit (result, c, base, precision);
overflow |= result.overflow;
if (largest_digit < c)
largest_digit = c;
if (c >= base)
big_digit = true;
/* Strict inequality for when max is set to zero. */
if (result.low < max)
result.low = result.low * base + c;
else
{
result = append_digit (result, c, base, precision);
overflow |= result.overflow;
max = 0;
}
}
if (p < end)
@ -256,7 +286,7 @@ interpret_number (pfile, tok)
"too many 'l' suffixes in integer constant");
}
if (base <= largest_digit)
if (big_digit)
cpp_error (pfile, DL_PEDWARN,
"integer constant contains digits beyond the radix");
@ -787,12 +817,12 @@ num_trim (num, precision)
{
precision -= PART_PRECISION;
if (precision < PART_PRECISION)
num.high &= (1UL << precision) - 1;
num.high &= ((cpp_num_part) 1 << precision) - 1;
}
else
{
if (precision < PART_PRECISION)
num.low &= (1UL << precision) - 1;
num.low &= ((cpp_num_part) 1 << precision) - 1;
num.high = 0;
}
@ -808,10 +838,10 @@ num_positive (num, precision)
if (precision > PART_PRECISION)
{
precision -= PART_PRECISION;
return (num.high & (1UL << (precision - 1))) == 0;
return (num.high & (cpp_num_part) 1 << (precision - 1)) == 0;
}
return (num.low & (1UL << (precision - 1))) == 0;
return (num.low & (cpp_num_part) 1 << (precision - 1)) == 0;
}
/* Returns the negative of NUM. */
@ -1245,7 +1275,7 @@ num_div_op (pfile, lhs, rhs, op)
if (rhs.high)
{
i = precision - 1;
mask = 1UL << (i - PART_PRECISION);
mask = (cpp_num_part) 1 << (i - PART_PRECISION);
for (; ; i--, mask >>= 1)
if (rhs.high & mask)
break;
@ -1256,7 +1286,7 @@ num_div_op (pfile, lhs, rhs, op)
i = precision - PART_PRECISION - 1;
else
i = precision - 1;
mask = 1UL << i;
mask = (cpp_num_part) 1 << i;
for (; ; i--, mask >>= 1)
if (rhs.low & mask)
break;
@ -1284,9 +1314,9 @@ num_div_op (pfile, lhs, rhs, op)
{
lhs = num_binary_op (pfile, lhs, sub, CPP_MINUS);
if (i >= PART_PRECISION)
result.high |= 1UL << (i - PART_PRECISION);
result.high |= (cpp_num_part) 1 << (i - PART_PRECISION);
else
result.low |= 1UL << i;
result.low |= (cpp_num_part) 1 << i;
}
if (i-- == 0)
break;