Various optimisations by inverting branches and removing
redundant instructions.
Signed-off-by: Christophe Leroy <christophe.le...@c-s.fr>
---
arch/powerpc/kernel/vdso32/datapage.S | 3 +--
arch/powerpc/kernel/vdso32/getcpu.S | 6 +++---
arch/powerpc/kernel/vdso32/gettimeofday.S | 18 +++++++++---------
3 files changed, 13 insertions(+), 14 deletions(-)
diff --git a/arch/powerpc/kernel/vdso32/datapage.S
b/arch/powerpc/kernel/vdso32/datapage.S
index d480d2d4a3fe..436b88c455d1 100644
--- a/arch/powerpc/kernel/vdso32/datapage.S
+++ b/arch/powerpc/kernel/vdso32/datapage.S
@@ -31,11 +31,10 @@ V_FUNCTION_BEGIN(__kernel_get_syscall_map)
.cfi_startproc
mflr r12
.cfi_register lr,r12
- mr r4,r3
+ mr. r4,r3
get_datapage r3, r0
mtlr r12
addi r3,r3,CFG_SYSCALL_MAP32
- cmpli cr0,r4,0
beqlr
li r0,NR_syscalls
stw r0,0(r4)
diff --git a/arch/powerpc/kernel/vdso32/getcpu.S
b/arch/powerpc/kernel/vdso32/getcpu.S
index bde226ad904d..ac1faa8a2bfd 100644
--- a/arch/powerpc/kernel/vdso32/getcpu.S
+++ b/arch/powerpc/kernel/vdso32/getcpu.S
@@ -31,10 +31,10 @@ V_FUNCTION_BEGIN(__kernel_getcpu)
rlwinm r7,r5,16,31-15,31-0
beq cr0,1f
stw r6,0(r3)
-1: beq cr1,2f
- stw r7,0(r4)
-2: crclr cr0*4+so
+1: crclr cr0*4+so
li r3,0 /* always success */
+ beqlr cr1
+ stw r7,0(r4)
blr
.cfi_endproc
V_FUNCTION_END(__kernel_getcpu)
diff --git a/arch/powerpc/kernel/vdso32/gettimeofday.S
b/arch/powerpc/kernel/vdso32/gettimeofday.S
index c65f41c612f7..47aa44ab8bbb 100644
--- a/arch/powerpc/kernel/vdso32/gettimeofday.S
+++ b/arch/powerpc/kernel/vdso32/gettimeofday.S
@@ -35,10 +35,9 @@ V_FUNCTION_BEGIN(__kernel_gettimeofday)
mflr r12
.cfi_register lr,r12
- mr r10,r3 /* r10 saves tv */
+ mr. r10,r3 /* r10 saves tv */
mr r11,r4 /* r11 saves tz */
get_datapage r9, r0
- cmplwi r10,0 /* check if tv is NULL */
beq 3f
LOAD_REG_IMMEDIATE(r7, 1000000) /* load up USEC_PER_SEC */
bl __do_get_tspec@local /* get sec/usec from tb & kernel */
@@ -46,15 +45,16 @@ V_FUNCTION_BEGIN(__kernel_gettimeofday)
stw r4,TVAL32_TV_USEC(r10)
3: cmplwi r11,0 /* check if tz is NULL */
- beq 1f
+ mtlr r12
+ crclr cr0*4+so
+ li r3,0
+ beqlr
+
lwz r4,CFG_TZ_MINUTEWEST(r9)/* fill tz */
lwz r5,CFG_TZ_DSTTIME(r9)
stw r4,TZONE_TZ_MINWEST(r11)
stw r5,TZONE_TZ_DSTTIME(r11)
-1: mtlr r12
- crclr cr0*4+so
- li r3,0
blr
.cfi_endproc
V_FUNCTION_END(__kernel_gettimeofday)
@@ -248,10 +248,10 @@ V_FUNCTION_BEGIN(__kernel_time)
lwz r3,STAMP_XTIME+TSPEC_TV_SEC(r9)
cmplwi r11,0 /* check if t is NULL */
- beq 2f
- stw r3,0(r11) /* store result at *t */
-2: mtlr r12
+ mtlr r12
crclr cr0*4+so
+ beqlr
+ stw r3,0(r11) /* store result at *t */
blr
.cfi_endproc
V_FUNCTION_END(__kernel_time)
--
2.13.3
