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8e2c20023f
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> |
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acpi | ||
asm-alpha | ||
asm-arm | ||
asm-arm26 | ||
asm-avr32 | ||
asm-blackfin | ||
asm-cris | ||
asm-frv | ||
asm-generic | ||
asm-h8300 | ||
asm-i386 | ||
asm-ia64 | ||
asm-m32r | ||
asm-m68k | ||
asm-m68knommu | ||
asm-mips | ||
asm-parisc | ||
asm-powerpc | ||
asm-ppc | ||
asm-s390 | ||
asm-sh | ||
asm-sh64 | ||
asm-sparc | ||
asm-sparc64 | ||
asm-um | ||
asm-v850 | ||
asm-x86_64 | ||
asm-xtensa | ||
crypto | ||
keys | ||
linux | ||
math-emu | ||
media | ||
mtd | ||
net | ||
pcmcia | ||
rdma | ||
rxrpc | ||
scsi | ||
sound | ||
video | ||
Kbuild |