[LIB]: div64_64 optimization

[powerpc.git] / lib / div64.c

diff --git a/lib/div64.c b/lib/div64.c
index 365719f..74f0c8c 100644 (file)
--- a/lib/div64.c
+++ b/lib/div64.c
@@ -58,4 +58,24 @@ uint32_t __div64_32(uint64_t *n, uint32_t base)
 
 EXPORT_SYMBOL(__div64_32);
 
+/* 64bit divisor, dividend and result. dynamic precision */
+uint64_t div64_64(uint64_t dividend, uint64_t divisor)
+{
+       uint32_t high, d;
+
+       high = divisor >> 32;
+       if (high) {
+               unsigned int shift = fls(high);
+
+               d = divisor >> shift;
+               dividend >>= shift;
+       } else
+               d = divisor;
+
+       do_div(dividend, d);
+
+       return dividend;
+}
+EXPORT_SYMBOL(div64_64);
+
 #endif /* BITS_PER_LONG == 32 */