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-rw-r--r--lib/pure/bitops.nim2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/pure/bitops.nim b/lib/pure/bitops.nim
index 7dd171a38..4f22388f3 100644
--- a/lib/pure/bitops.nim
+++ b/lib/pure/bitops.nim
@@ -395,6 +395,8 @@ proc firstSetBitNim(x: uint64): int {.inline, noSideEffect.} =
   if k == 0:
     k = uint32(v shr 32'u32) and 0xFFFFFFFF'u32
     result = 32
+  else:
+    result = 0
   result += firstSetBitNim(k)
 
 proc fastlog2Nim(x: uint32): int {.inline, noSideEffect.} =