litmus-rt.git - The LITMUS^RT kernel.

	Commit message (Collapse)	Author	Age
*	Fix constant folding and poor optimization in byte swapping code	Trent Piepho	2007-05-08
\| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \|	Constant folding does not work for the swabXX() byte swapping functions, and the C versions optimize poorly. Attempting to initialize a global variable to swab16(0x1234) or put something like "case swab32(42):" in a switch statement will not compile. It can work, swab.h just isn't doing it correctly. This patch fixes that. Contrary to the comment in asm-i386/byteorder.h, gcc does not recognize the "C" version of swab16 and turn it into efficient code. gcc can do this, just not with the current code. The simple function: u16 foo(u16 x) { return swab16(x); } Would compile to: movzwl %ax, %eax movl %eax, %edx shrl $8, %eax sall $8, %edx orl %eax, %edx With this patch, it will compile to: rolw $8, %ax I also attempted to document the maze different macros/inline functions that are used to create the final product. Signed-off-by: Trent Piepho <xyzzy@speakeasy.org> Cc: Francois-Rene Rideau <fare@tunes.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
*	[PATCH] remove gcc-2 checks	Andrew Morton	2006-01-08
\| \| \| \| \| \| \| \| \| \| \| \| \|	Remove various things which were checking for gcc-1.x and gcc-2.x compilers. From: Adrian Bunk <bunk@stusta.de> Some documentation updates and removes some code paths for gcc < 3.2. Acked-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
*	Linux-2.6.12-rc2v2.6.12-rc2	Linus Torvalds	2005-04-16
	Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!