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powerpc/8xx: Duplicate two insns instead of branching

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Branching takes two cycles on MPC8xx. Lets duplicate the two instructions
and avoid the branching.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Scott Wood <scottwood@freescale.com>
This commit is contained in:
LEROY Christophe 2014-08-29 11:14:39 +02:00 committed by Scott Wood
parent 41cacac63c
commit 111e32b2f6
1 changed files with 4 additions and 2 deletions
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6
arch/powerpc/kernel/head_8xx.S
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@ -644,9 +644,11 @@ modified_instr:
/* special handling for r10,r11 since these are modified already */
153: mfspr r11, SPRN_SPRG_SCRATCH1 /* load r11 from SPRN_SPRG_SCRATCH1 */
b 155f
add r10, r10, r11 /* add it */
mfctr r11 /* restore r11 */
b 151b
154: mfspr r11, SPRN_SPRG_SCRATCH0 /* load r10 from SPRN_SPRG_SCRATCH0 */
155: add r10, r10, r11 /* add it */
add r10, r10, r11 /* add it */
mfctr r11 /* restore r11 */
b 151b
#endif