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powerpc/8xx: Duplicate two insns instead of branching
author
LEROY Christophe
<christophe.leroy@c-s.fr>
Fri, 29 Aug 2014 09:14:39 +0000
(11:14 +0200)
committer
Scott Wood
<scottwood@freescale.com>
Fri, 5 Sep 2014 00:28:56 +0000
(19:28 -0500)
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>
arch/powerpc/kernel/head_8xx.S
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diff --git
a/arch/powerpc/kernel/head_8xx.S
b/arch/powerpc/kernel/head_8xx.S
index
1bdd7c1
..
fafff8d
100644
(file)
--- a/
arch/powerpc/kernel/head_8xx.S
+++ b/
arch/powerpc/kernel/head_8xx.S
@@
-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