Add optimized versions of musl libc string and memory comparison functions.

emcc

@@ -1476,6 +1476,13 @@ try:
         ['stdlib', [
          'atof.c',
          'strtod.c',
+        ]],
+        ['string', [
+         'memcmp.c',
+         'strcasecmp.c',
+         'strcmp.c',
+         'strncasecmp.c',
+         'strncmp.c',
         ]]
       ]
       for directory, sources in musl_files:

src/library.js

@@ -3754,10 +3754,6 @@ LibraryManager.library = {
     return pdest;
   },
 
-  strcmp__deps: ['strncmp'],
-  strcmp: function(px, py) {
-    return _strncmp(px, py, TOTAL_MEMORY);
-  },
   // We always assume ASCII locale.
   strcoll: 'strcmp',
   strcoll_l__deps: ['strcoll'],
@@ -3765,68 +3761,6 @@ LibraryManager.library = {
     return _strcoll(px, py); // no locale support yet
   },
 
-  strcasecmp__asm: true,
-  strcasecmp__sig: 'iii',
-  strcasecmp__deps: ['strncasecmp'],
-  strcasecmp: function(px, py) {
-    px = px|0; py = py|0;
-    return _strncasecmp(px, py, -1)|0;
-  },
-
-  strncmp: function(px, py, n) {
-    var i = 0;
-    while (i < n) {
-      var x = {{{ makeGetValue('px', 'i', 'i8', 0, 1) }}};
-      var y = {{{ makeGetValue('py', 'i', 'i8', 0, 1) }}};
-      if (x == y && x == 0) return 0;
-      if (x == 0) return -1;
-      if (y == 0) return 1;
-      if (x == y) {
-        i ++;
-        continue;
-      } else {
-        return x > y ? 1 : -1;
-      }
-    }
-    return 0;
-  },
-
-  strncasecmp__asm: true,
-  strncasecmp__sig: 'iiii',
-  strncasecmp__deps: ['tolower'],
-  strncasecmp: function(px, py, n) {
-    px = px|0; py = py|0; n = n|0;
-    var i = 0, x = 0, y = 0;
-    while ((i>>>0) < (n>>>0)) {
-      x = _tolower({{{ makeGetValueAsm('px', 'i', 'i8', 0, 1) }}})|0;
-      y = _tolower({{{ makeGetValueAsm('py', 'i', 'i8', 0, 1) }}})|0;
-      if (((x|0) == (y|0)) & ((x|0) == 0)) return 0;
-      if ((x|0) == 0) return -1;
-      if ((y|0) == 0) return 1;
-      if ((x|0) == (y|0)) {
-        i = (i + 1)|0;
-        continue;
-      } else {
-        return ((x>>>0) > (y>>>0) ? 1 : -1)|0;
-      }
-    }
-    return 0;
-  },
-
-  memcmp__asm: true,
-  memcmp__sig: 'iiii',
-  memcmp: function(p1, p2, num) {
-    p1 = p1|0; p2 = p2|0; num = num|0;
-    var i = 0, v1 = 0, v2 = 0;
-    while ((i|0) < (num|0)) {
-      v1 = {{{ makeGetValueAsm('p1', 'i', 'i8', true) }}};
-      v2 = {{{ makeGetValueAsm('p2', 'i', 'i8', true) }}};
-      if ((v1|0) != (v2|0)) return ((v1|0) > (v2|0) ? 1 : -1)|0;
-      i = (i+1)|0;
-    }
-    return 0;
-  },
-
   memchr: function(ptr, chr, num) {
     chr = unSign(chr);
     for (var i = 0; i < num; i++) {

system/lib/libc.symbols

@@ -72,7 +72,12 @@
          W realloc_in_place
          T scalbn
          T scalbnl
+         T memcpy
          T strtod
+         T strcmp
+         T strncmp
+         T strcasecmp
+         T strncasecmp
          T strtod_l
          T strtof
          T strtof_l

system/lib/libc/musl/src/string/memcmp.c

@@ -0,0 +1,8 @@
+#include <string.h>
+
+int memcmp(const void *vl, const void *vr, size_t n)
+{
+	const unsigned char *l=vl, *r=vr;
+	for (; n && *l == *r; n--, l++, r++);
+	return n ? *l-*r : 0;
+}

system/lib/libc/musl/src/string/strcasecmp.c

@@ -0,0 +1,9 @@
+#include <strings.h>
+#include <ctype.h>
+
+int strcasecmp(const char *_l, const char *_r)
+{
+	const unsigned char *l=(void *)_l, *r=(void *)_r;
+	for (; *l && *r && (*l == *r || tolower(*l) == tolower(*r)); l++, r++);
+	return tolower(*l) - tolower(*r);
+}

system/lib/libc/musl/src/string/strcmp.c

@@ -0,0 +1,7 @@
+#include <string.h>
+
+int strcmp(const char *l, const char *r)
+{
+	for (; *l==*r && *l; l++, r++);
+	return *(unsigned char *)l - *(unsigned char *)r;
+}

system/lib/libc/musl/src/string/strncasecmp.c

@@ -0,0 +1,10 @@
+#include <strings.h>
+#include <ctype.h>
+
+int strncasecmp(const char *_l, const char *_r, size_t n)
+{
+	const unsigned char *l=(void *)_l, *r=(void *)_r;
+	if (!n--) return 0;
+	for (; *l && *r && n && (*l == *r || tolower(*l) == tolower(*r)); l++, r++, n--);
+	return tolower(*l) - tolower(*r);
+}

system/lib/libc/musl/src/string/strncmp.c

@@ -0,0 +1,9 @@
+#include <string.h>
+
+int strncmp(const char *_l, const char *_r, size_t n)
+{
+	const unsigned char *l=(void *)_l, *r=(void *)_r;
+	if (!n--) return 0;
+	for (; *l && *r && n && *l == *r ; l++, r++, n--);
+	return *l - *r;
+}

tools/shared.py

@@ -345,7 +345,7 @@ def find_temp_directory():
 # we re-check sanity when the settings are changed)
 # We also re-check sanity and clear the cache when the version changes
 
-EMSCRIPTEN_VERSION = '1.10.1'
+EMSCRIPTEN_VERSION = '1.10.2'
 
 def generate_sanity():
   return EMSCRIPTEN_VERSION + '|' + get_llvm_target() + '|' + LLVM_ROOT + '|' + get_clang_version()