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arm: Consistently use proper interworking function returns 

Use "bx lr", or "pop {lr}", which do proper mode switching
between thumb and arm modes. A plain "mov pc, lr" does not switch
from thumb mode to arm mode (while in arm mode, it does switch
mode for a thumb caller).

This is normally not an issue, as CONFIG_THUMB only is enabled if
the C compiler defaults to thumb; but stick to patterns that can
do mode switching if needed, for consistency.

Signed-off-by: Martin Storsjö <martin@martin.st>
(cherry picked from commit 77e6293735)
This commit is contained in:
Martin Storsjö 2024-10-04 00:30:24 +03:00
parent 63f5c007a7
commit 794245fa71
4 changed files with 7 additions and 10 deletions
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8
libswresample/arm/resample.S
View File

@ -30,7 +30,7 @@ function ff_resample_common_apply_filter_x4_float_neon, export=1
vpadd.f32 d0, d0, d1 @ pair adding of the 4x32-bit accumulated values
vpadd.f32 d0, d0, d0 @ pair adding of the 4x32-bit accumulator values
vst1.32 {d0[0]}, [r0] @ write accumulator
mov pc, lr
bx lr
endfunc
function ff_resample_common_apply_filter_x8_float_neon, export=1
@ -46,7 +46,7 @@ function ff_resample_common_apply_filter_x8_float_neon, export=1
vpadd.f32 d0, d0, d1 @ pair adding of the 4x32-bit accumulated values
vpadd.f32 d0, d0, d0 @ pair adding of the 4x32-bit accumulator values
vst1.32 {d0[0]}, [r0] @ write accumulator
mov pc, lr
bx lr
endfunc
function ff_resample_common_apply_filter_x4_s16_neon, export=1
@ -59,7 +59,7 @@ function ff_resample_common_apply_filter_x4_s16_neon, export=1
vpadd.s32 d0, d0, d1 @ pair adding of the 4x32-bit accumulated values
vpadd.s32 d0, d0, d0 @ pair adding of the 4x32-bit accumulator values
vst1.32 {d0[0]}, [r0] @ write accumulator
mov pc, lr
bx lr
endfunc
function ff_resample_common_apply_filter_x8_s16_neon, export=1
@ -73,5 +73,5 @@ function ff_resample_common_apply_filter_x8_s16_neon, export=1
vpadd.s32 d0, d0, d1 @ pair adding of the 4x32-bit accumulated values
vpadd.s32 d0, d0, d0 @ pair adding of the 4x32-bit accumulator values
vst1.32 {d0[0]}, [r0] @ write accumulator
mov pc, lr
bx lr
endfunc

3
libswscale/arm/hscale.S
View File

@ -65,6 +65,5 @@ function ff_hscale_8_to_15_neon, export=1
subs r2, #2 @ dstW -= 2
bgt 1b @ loop until end of line
vpop {q4-q7}
pop {r4-r12, lr}
mov pc, lr
pop {r4-r12, pc}
endfunc

3
libswscale/arm/output.S
View File

@ -73,6 +73,5 @@ function ff_yuv2planeX_8_neon, export=1
subs r4, r4, #8 @ dstW -= 8
bgt 2b @ loop until width is consumed
vpop {q4-q7}
pop {r4-r12, lr}
mov pc, lr
pop {r4-r12, pc}
endfunc

3
libswscale/arm/yuv2rgb_neon.S
View File

@ -262,8 +262,7 @@ function ff_\ifmt\()_to_\ofmt\()_neon, export=1
increment_and_test_\ifmt
bgt 1b
vpop {q4-q7}
pop {r4-r12, lr}
mov pc, lr
pop {r4-r12, pc}
endfunc
.endm