libroot: Add memcmp optimization similar to the strcmp one.

And cleanup the strcmp one a bit for consistency.

src/system/libroot/posix/string/memcmp.c

@@ -4,6 +4,7 @@
  */
 
 
+#include <stdint.h>
 #include <string.h>
 
 
@@ -13,6 +14,19 @@ memcmp(const void *_a, const void *_b, size_t count)
 	const unsigned char *a = (const unsigned char *)_a;
 	const unsigned char *b = (const unsigned char *)_b;
 
+	if ((((addr_t)a) & 3) == 0 && (((addr_t)b) & 3) == 0) {
+		uint32_t *a32 = (uint32_t *)a;
+		uint32_t *b32 = (uint32_t *)b;
+
+		while (count >= 4 && *a32 == *b32) {
+			a32++;
+			b32++;
+			count -= 4;
+		}
+		a = (const unsigned char *)a32;
+		b = (const unsigned char *)b32;
+	}
+
 	while (count-- > 0) {
 		int cmp = *a++ - *b++;
 		if (cmp != 0)

src/system/libroot/posix/string/strcmp.c

@@ -4,9 +4,8 @@
  */
 
 
-#include <stdbool.h>
+#include <stdint.h>
 #include <string.h>
-#include <SupportDefs.h>
 
 
 #define LACKS_ZERO_BYTE(value) \
@@ -16,8 +15,8 @@ int
 strcmp(char const *a, char const *b)
 {
 	if ((((addr_t)a) & 3) == 0 && (((addr_t)b) & 3) == 0) {
-		uint32* a32 = (uint32*)a;
-		uint32* b32 = (uint32*)b;
+		uint32_t *a32 = (uint32_t *)a;
+		uint32_t *b32 = (uint32_t *)b;
 
 		while (*a32 == *b32 && LACKS_ZERO_BYTE((*a32))) {
 			a32++;
@@ -27,7 +26,7 @@ strcmp(char const *a, char const *b)
 		b = (const char *)b32;
 	}
 
-	while (true) {
+	while (1) {
 		int cmp = (unsigned char)*a - (unsigned char)*b++;
 		if (cmp != 0 || *a++ == '\0')
 			return cmp;