Migrate to using musl 0.9.13 stpcpy for better asm.js performance.

2 files changed, 30 insertions, 0 deletions

diff --git a/system/lib/libc/musl/src/string/stpcpy.c b/system/lib/libc/musl/src/string/stpcpy.c
new file mode 100644
index 00000000..feb9eb81
--- /dev/null
+++ b/system/lib/libc/musl/src/string/stpcpy.c
@@ -0,0 +1,29 @@
+#include <string.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <limits.h>
+#include "libc.h"
+
+#define ALIGN (sizeof(size_t))
+#define ONES ((size_t)-1/UCHAR_MAX)
+#define HIGHS (ONES * (UCHAR_MAX/2+1))
+#define HASZERO(x) ((x)-ONES & ~(x) & HIGHS)
+
+char *__stpcpy(char *restrict d, const char *restrict s)
+{
+	size_t *wd;
+	const size_t *ws;
+
+	if ((uintptr_t)s % ALIGN == (uintptr_t)d % ALIGN) {
+		for (; (uintptr_t)s % ALIGN; s++, d++)
+			if (!(*d=*s)) return d;
+		wd=(void *)d; ws=(const void *)s;
+		for (; !HASZERO(*ws); *wd++ = *ws++);
+		d=(void *)wd; s=(const void *)ws;
+	}
+	for (; (*d=*s); s++, d++);
+
+	return d;
+}
+
+weak_alias(__stpcpy, stpcpy);
diff --git a/system/lib/libcextra.symbols b/system/lib/libcextra.symbols
index e38afa70..fc3eaf99 100644
--- a/system/lib/libcextra.symbols
+++ b/system/lib/libcextra.symbols
@@ -108,6 +108,7 @@
          T regfree
          T scalbnf
          D signgam
+         T stpcpy
          T strcasecmp_l
          T strcasestr
          W strchrnul