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arm: vp9itxfm: Simplify the stack alignment code 

This is one instruction less for thumb, and only have got
1/2 arm/thumb specific instructions.

This is cherrypicked from libav commit
e5b0fc170f.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Janne Grunau 2017-01-10 00:15:09 +02:00 committed by Michael Niedermayer
parent cb220eeef9
commit a71cd8439f
1 changed files with 12 additions and 16 deletions
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28
libavcodec/arm/vp9itxfm_neon.S
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@ -791,15 +791,13 @@ function ff_vp9_\txfm1\()_\txfm2\()_16x16_add_neon, export=1
.ifnc \txfm1\()_\txfm2,idct_idct
vpush {q4-q7}
.endif
mov r7, sp
@ Align the stack, allocate a temp buffer
T mov r12, sp
T bic r12, r12, #15
T sub r12, r12, #512
T mov sp, r12
A bic sp, sp, #15
A sub sp, sp, #512
T mov r7, sp
T and r7, r7, #15
A and r7, sp, #15
add r7, r7, #512
sub sp, sp, r7
mov r4, r0
mov r5, r1
@ -828,7 +826,7 @@ A sub sp, sp, #512
bl \txfm2\()16_1d_4x16_pass2_neon
.endr
mov sp, r7
add sp, sp, r7
.ifnc \txfm1\()_\txfm2,idct_idct
vpop {q4-q7}
.endif
@ -1117,15 +1115,13 @@ function ff_vp9_idct_idct_32x32_add_neon, export=1
beq idct32x32_dc_add_neon
push {r4-r7,lr}
vpush {q4-q7}
mov r7, sp
@ Align the stack, allocate a temp buffer
T mov r12, sp
T bic r12, r12, #15
T sub r12, r12, #2048
T mov sp, r12
A bic sp, sp, #15
A sub sp, sp, #2048
T mov r7, sp
T and r7, r7, #15
A and r7, sp, #15
add r7, r7, #2048
sub sp, sp, r7
mov r4, r0
mov r5, r1
@ -1143,7 +1139,7 @@ A sub sp, sp, #2048
bl idct32_1d_4x32_pass2_neon
.endr
mov sp, r7
add sp, sp, r7
vpop {q4-q7}
pop {r4-r7,pc}
endfunc