diff options
| -rw-r--r-- | sys/src/9/port/mul64fract.c | 18 |
1 files changed, 7 insertions, 11 deletions
diff --git a/sys/src/9/port/mul64fract.c b/sys/src/9/port/mul64fract.c index ca6270739..aa3d1c9e2 100644 --- a/sys/src/9/port/mul64fract.c +++ b/sys/src/9/port/mul64fract.c @@ -21,19 +21,15 @@ void mul64fract(uvlong *r, uvlong a, uvlong b) { - uvlong bh, bl; - uvlong ah, al; - uvlong res; + ulong bh, bl, ah, al; - bl = b & 0xffffffffULL; + bl = b; bh = b >> 32; - al = a & 0xffffffffULL; + al = a; ah = a >> 32; - res = (al*bl)>>32; - res += (al*bh); - res += (ah*bl); - res += (ah*bh)<<32; - - *r = res; + *r = (((uvlong)al*(uvlong)bl)>>32) + + ((uvlong)al*(uvlong)bh) + + ((uvlong)ah*(uvlong)bl) + + (((uvlong)ah*(uvlong)bh)<<32); } |