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yaml
---
r: 28082
b: refs/heads/master
c: 441ff85
h: refs/heads/master
v: v3
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H. Peter Anvin authored and Russell King committed Jun 19, 2006
1 parent 1fbf441 commit 94506b2
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Showing 2 changed files with 7 additions and 5 deletions.
2 changes: 1 addition & 1 deletion [refs]
Original file line number Diff line number Diff line change
@@ -1,2 +1,2 @@
---
refs/heads/master: 5e6423871772b89120c9fb356d2eabb67fea60bd
refs/heads/master: 441ff855f3edf5d355bea30f557bbed6bcd42c6c
10 changes: 6 additions & 4 deletions trunk/include/asm-arm/byteorder.h
Original file line number Diff line number Diff line change
Expand Up @@ -22,16 +22,18 @@ static inline __attribute_const__ __u32 ___arch__swab32(__u32 x)
{
__u32 t;

if (__builtin_constant_p(x)) {
t = x ^ ((x << 16) | (x >> 16)); /* eor r1,r0,r0,ror #16 */
} else {
#ifndef __thumb__
if (!__builtin_constant_p(x)) {
/*
* The compiler needs a bit of a hint here to always do the
* right thing and not screw it up to different degrees
* depending on the gcc version.
*/
asm ("eor\t%0, %1, %1, ror #16" : "=r" (t) : "r" (x));
}
} else
#endif
t = x ^ ((x << 16) | (x >> 16)); /* eor r1,r0,r0,ror #16 */

x = (x << 24) | (x >> 8); /* mov r0,r0,ror #8 */
t &= ~0x00FF0000; /* bic r1,r1,#0x00FF0000 */
x ^= (t >> 8); /* eor r0,r0,r1,lsr #8 */
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