This saves three scratch registers and three instructions per line. The
performance gains are mostly negligible. The main point is to free up
registers for further rework.
---
libswscale/riscv/rgb2rgb_rvv.S | 25 ++++++++++++-------------
1 file changed, 12 insertions(+), 13 deletions(-)
diff --git a/libswscale/riscv/rgb2rgb_rvv.S b/libswscale/riscv/rgb2rgb_rvv.S
index 671089c842..172f5918dc 100644
--- a/libswscale/riscv/rgb2rgb_rvv.S
+++ b/libswscale/riscv/rgb2rgb_rvv.S
@@ -127,31 +127,30 @@ func ff_deinterleave_bytes_rvv, zve32x
endfunc
.macro yuy2_to_i422p y_shift
- addi a4, a4, 1
+ slli t4, a4, 1 // pixel width -> (source) byte width
lw t6, (sp)
+ sub a6, a6, a4
srai a4, a4, 1 // pixel width -> chroma width
+ sub a7, a7, a4
+ sub t6, t6, t4
1:
mv t4, a4
- mv t3, a3
- mv t0, a0
- mv t1, a1
- mv t2, a2
addi a5, a5, -1
2:
vsetvli t5, t4, e8, m2, ta, ma
- vlseg2e16.v v16, (t3)
+ vlseg2e16.v v16, (a3)
sub t4, t4, t5
vnsrl.wi v24, v16, \y_shift // Y0
- sh2add t3, t5, t3
+ sh2add a3, t5, a3
vnsrl.wi v26, v20, \y_shift // Y1
vnsrl.wi v28, v16, 8 - \y_shift // U
vnsrl.wi v30, v20, 8 - \y_shift // V
- vsseg2e8.v v24, (t0)
- sh1add t0, t5, t0
- vse8.v v28, (t1)
- add t1, t5, t1
- vse8.v v30, (t2)
- add t2, t5, t2
+ vsseg2e8.v v24, (a0)
+ sh1add a0, t5, a0
+ vse8.v v28, (a1)
+ add a1, t5, a1
+ vse8.v v30, (a2)
+ add a2, t5, a2
bnez t4, 2b
add a3, a3, t6
--
2.42.0
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