update bit.extract, bit.replace

b58242c5 · Chen Bill · 7c918ad9 · b58242c5
Commit b58242c5 authored Dec 05, 2023 by Chen Bill
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utility.lua utility.lua +2 -0

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--- a/utility.lua
+++ b/utility.lua
@@ -37,10 +37,12 @@ local function fieldargs(f,width)
 	return f,~(-1<<w)
 end
 function bit.extract(r,field,width)
+	width=width or 1
 	local f,m=fieldargs(field,width)
 	return (r>>f)&m
 end
 function bit.replace(r,v,field,width)
+	width=width or 1
 	local f,m=fieldargs(field,width)
 	return (r&~(m<<f))|((v&m)<< f)
 end