Subject: Re: Bitfields and kernel
To: None <>
From: Anders Magnusson <>
List: tech-kern
Date: 09/29/1999 16:29:47
> In the end I would have to claim that if bit-field operations generate
> worse code than the equivalent bit-fiddling idioms then the compiler is
> at fault.  (Comparing with hand optimised machine code is obviously
> apples to oranges.)
Also notice that bitfield instructions (extv) is normally slower than
corresponding shift/and (ashl/bicl) insn's on all but very old VAXen...

-- Ragge