stop at end of mask index

diff --git a/src/ieee754/part_mul_add/partpoints.py b/src/ieee754/part_mul_add/partpoints.py
index efc55e4128e6ef38e928ebc7646f3391c4bb2f3a..e138490be2d8a14083a7e5cd33e7ac135251fc6a 100644 (file)
--- a/src/ieee754/part_mul_add/partpoints.py
+++ b/src/ieee754/part_mul_add/partpoints.py
@@ -18,7 +18,7 @@ def make_partition(mask, width):
     mlen = mask.shape()[0]
     ppos = mlen
     midx = 0
-    while ppos < width-1: # -1, ignore last bit
+    while ppos < width and midx < mlen: # -1, ignore last bit
         ppoints[ppos] = mask[midx]
         ppos += mlen
         midx += 1