Adwaith-Rajesh/gperf
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Speed up the case-insensitive lookups.

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This commit is contained in:
Bruno Haible
2003-04-24 10:47:54 +00:00
parent 7ccc2cf132
commit 2598419bcf
3 changed files with 127 additions and 12 deletions
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99
src/output.cc
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@@ -230,6 +230,42 @@ Output::output_constants (struct Output_Constants& style) const
/* ------------------------------------------------------------------------- */
/* We use a downcase table because when called repeatedly, the code
gperf_downcase[c]
is faster than
if (c >= 'A' && c <= 'Z')
c += 'a' - 'A';
*/
#define USE_DOWNCASE_TABLE 1
#if USE_DOWNCASE_TABLE
/* Output gperf's ASCII-downcase table. */
static void
output_upperlower_table ()
{
unsigned int c;
printf ("#ifndef GPERF_DOWNCASE\n"
"#define GPERF_DOWNCASE 1\n"
"static unsigned char gperf_downcase[256] =\n"
" {");
for (c = 0; c < 256; c++)
{
if ((c % 15) == 0)
printf ("\n ");
printf (" %3d", c >= 'A' && c <= 'Z' ? c + 'a' - 'A' : c);
if (c < 255)
printf (",");
}
printf ("\n"
" };\n"
"#endif\n\n");
}
#endif
/* Output gperf's ASCII-case insensitive strcmp replacement. */
static void
@@ -250,6 +286,18 @@ output_upperlower_strcmp ()
option[ANSIC] | option[CPLUSPLUS] ?
"(register const char *s1, register const char *s2)\n" :
"");
#if USE_DOWNCASE_TABLE
printf ("{\n"
" for (;;)\n"
" {\n"
" unsigned char c1 = gperf_downcase[(unsigned char)*s1++];\n"
" unsigned char c2 = gperf_downcase[(unsigned char)*s2++];\n"
" if (c1 != 0 && c1 == c2)\n"
" continue;\n"
" return (int)c1 - (int)c2;\n"
" }\n"
"}\n");
#else
printf ("{\n"
" for (;;)\n"
" {\n"
@@ -263,8 +311,9 @@ output_upperlower_strcmp ()
" continue;\n"
" return (int)c1 - (int)c2;\n"
" }\n"
"}\n"
"#endif\n\n");
"}\n");
#endif
printf ("#endif\n\n");
}
/* Output gperf's ASCII-case insensitive strncmp replacement. */
@@ -289,6 +338,22 @@ output_upperlower_strncmp ()
option[ANSIC] | option[CPLUSPLUS] ?
"(register const char *s1, register const char *s2, register unsigned int n)\n" :
"");
#if USE_DOWNCASE_TABLE
printf ("{\n"
" for (; n > 0;)\n"
" {\n"
" unsigned char c1 = gperf_downcase[(unsigned char)*s1++];\n"
" unsigned char c2 = gperf_downcase[(unsigned char)*s2++];\n"
" if (c1 != 0 && c1 == c2)\n"
" {\n"
" n--;\n"
" continue;\n"
" }\n"
" return (int)c1 - (int)c2;\n"
" }\n"
" return 0;\n"
"}\n");
#else
printf ("{\n"
" for (; n > 0;)\n"
" {\n"
@@ -306,8 +371,9 @@ output_upperlower_strncmp ()
" return (int)c1 - (int)c2;\n"
" }\n"
" return 0;\n"
"}\n"
"#endif\n\n");
"}\n");
#endif
printf ("#endif\n\n");
}
/* Output gperf's ASCII-case insensitive memcmp replacement. */
@@ -332,6 +398,22 @@ output_upperlower_memcmp ()
option[ANSIC] | option[CPLUSPLUS] ?
"(register const char *s1, register const char *s2, register unsigned int n)\n" :
"");
#if USE_DOWNCASE_TABLE
printf ("{\n"
" for (; n > 0;)\n"
" {\n"
" unsigned char c1 = gperf_downcase[(unsigned char)*s1++];\n"
" unsigned char c2 = gperf_downcase[(unsigned char)*s2++];\n"
" if (c1 == c2)\n"
" {\n"
" n--;\n"
" continue;\n"
" }\n"
" return (int)c1 - (int)c2;\n"
" }\n"
" return 0;\n"
"}\n");
#else
printf ("{\n"
" for (; n > 0;)\n"
" {\n"
@@ -349,8 +431,9 @@ output_upperlower_memcmp ()
" return (int)c1 - (int)c2;\n"
" }\n"
" return 0;\n"
"}\n"
"#endif\n\n");
"}\n");
#endif
printf ("#endif\n\n");
}
/* ------------------------------------------------------------------------- */
@@ -1903,6 +1986,10 @@ Output::output ()
if (option[UPPERLOWER])
{
#if USE_DOWNCASE_TABLE
output_upperlower_table ();
#endif
if (option[LENTABLE])
output_upperlower_memcmp ();
else