another gcc 6 warning fix

compile on osx again
remove asm version of i?mult64 (was needed only for clang because it
didn't have __uint128_t, but it now has it)

fmt/fmt_strn.c

@@ -5,10 +5,18 @@ size_t fmt_strn(char *out,const char *in,size_t limit) {
   register const char* t=in;
   register const char* u=in+limit;
   for (;;) {
-    if (!*t || t==u) break; if (s) { *s=*t; ++s; } ++t;
+    if (!*t || t==u) break;
-    if (!*t || t==u) break; if (s) { *s=*t; ++s; } ++t;
+                            if (s) { *s=*t; ++s; }
-    if (!*t || t==u) break; if (s) { *s=*t; ++s; } ++t;
+                                                   ++t;
-    if (!*t || t==u) break; if (s) { *s=*t; ++s; } ++t;
+    if (!*t || t==u) break;
+                            if (s) { *s=*t; ++s; }
+                                                   ++t;
+    if (!*t || t==u) break;
+                            if (s) { *s=*t; ++s; }
+                                                   ++t;
+    if (!*t || t==u) break;
+                            if (s) { *s=*t; ++s; }
+                                                   ++t;
   }
   return (size_t)(t-in);
 }

fmt/fmt_varint.c

@@ -15,4 +15,10 @@ size_t fmt_varint(char* dest,unsigned long long l) {
   return i;
 }
 
+#ifdef __ELF__
 size_t fmt_pb_type0_int(char* dest,unsigned long long l) __attribute__((alias("fmt_varint")));
+#else
+size_t fmt_pb_type0_int(char* dest,unsigned long long l) {
+  return fmt_varint(dest,l);
+}
+#endif

mult/imult64.c

@@ -4,28 +4,6 @@
 
 int imult64( int64 a, int64 b, int64* c) { return !__builtin_mul_overflow(a,b,c); }
 
-#else
-
-#if defined(__x86_64__) && defined(__OPTIMIZE__)
-
-/* WARNING: this only works if compiled with -fomit-frame-pointer */
-void imult64() {
-  asm volatile(
-    "xchgq %rdx,%rsi\n"
-    "movq %rdi,%rax\n"
-    "imulq %rdx\n"
-    "jc 1f\n"	/* overflow */
-    "movq %rax,(%rsi)\n"
-    "xorq %rax,%rax\n"
-    "inc %rax\n"
-    "ret\n"
-    "1:\n"
-    "xorq %rax,%rax\n"
-    /* the closing ret is renerated by gcc */
-    );
-}
-
-
 #else
 
 #include "safemult.h"
@@ -54,5 +32,3 @@ int imult64(int64 a,int64 b,int64* c) {
 #endif
 
 #endif
-
-#endif

mult/umult64.c

@@ -8,27 +8,6 @@ int umult64(uint64 a,uint64 b,uint64* c) { return !__builtin_mul_overflow(a,b,c)
 
 #include "haveuint128.h"
 
-#if defined(__x86_64__) && defined(__OPTIMIZE__)
-
-/* WARNING: this only works if compiled with -fomit-frame-pointer */
-void umult64() {
-  asm volatile(
-    "xchgq %rdx,%rsi\n"
-    "movq %rdi,%rax\n"
-    "mulq %rdx\n"
-    "jc 1f\n"	/* overflow */
-    "movq %rax,(%rsi)\n"
-    "xorq %rax,%rax\n"
-    "inc %rax\n"
-    "ret\n"
-    "1:\n"
-    "xorq %rax,%rax\n"
-    /* the closing ret is renerated by gcc */
-    );
-}
-
-#else
-
 #include "safemult.h"
 
 #if defined(HAVE_UINT128)
@@ -68,5 +47,3 @@ int umult64(uint64 a,uint64 b,uint64* c) {
 #endif
 
 #endif
-
-#endif