URL:
<http://savannah.nongnu.org/bugs/?18994>
Summary: minor optimization possible to stdlib functions
isspace(), isprint(), and islower()
Project: AVR C Runtime Library
Submitted by: None
Submitted on: Thursday 02/08/07 at 11:14 UTC
Category: Library
Severity: 3 - Normal
Priority: 5 - Normal
Item Group: libc code
Status: None
Privacy: Public
Percent Complete: 0%
Assigned to: None
Originator Email: [EMAIL PROTECTED]
Open/Closed: Open
Discussion Lock: Any
_______________________________________________________
Details:
The stdlib function isdigit uses a compact way to test if input is within a
given range:
GLOBAL(isdigit)
CPSE rHigh,__zero_reg__
1:
RJMP _U(__ctype_isfalse)
SUBI rLow,'0'
SUBI rLow,10
BRSH 1b
RET ; rLow: -10..-1
ENDFUNC
Other functions in the same file (ctype.S) use the slightly larger
CPI-BRLT-CPI-BRGE combination to test the same thing. At least isspace,
isprint and islower could use a similar test as isdigit.
_______________________________________________________
Reply to this item at:
<http://savannah.nongnu.org/bugs/?18994>
_______________________________________________
Message sent via/by Savannah
http://savannah.nongnu.org/
_______________________________________________
AVR-libc-dev mailing list
[email protected]
http://lists.nongnu.org/mailman/listinfo/avr-libc-dev
