URL:
<http://savannah.nongnu.org/bugs/?35496>
Summary: _FFS: Macro should be obsoleted/no more recommended
Project: AVR C Runtime Library
Submitted by: gjlayde
Submitted on: Do 09 Feb 2012 21:43:52 GMT
Category: Library
Severity: 3 - Normal
Priority: 5 - Normal
Item Group: libc code
Status: None
Percent Complete: 0%
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Release: 1.8.0
Fixed Release: None
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Details:
GCC's builtin machinery can fold ffs* with constant arguments.
If a no-constant is passed to ffs resp. ffsl then avr-gcc provides efficient
assembler implementations, see __ffshi2 and __ffssi2 in libgcc:
http://gcc.gnu.org/viewcvs/trunk/libgcc/config/avr/lib1funcs.S?content-type=text%2Fplain&view=co
Notice that avr-gcc is aware of the reduces register footprint of these libgcc
functions.
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