[FFmpeg-devel] [PATCH 08/29] lavu/floatdsp: RISC-V V vector_dmul_scalar

[remi@remlab.net]

From: Rémi Denis-Courmont <remi@remlab.net>

---
 libavutil/riscv/float_dsp_init.c |  9 ++++++++-
 libavutil/riscv/float_dsp_rvv.S  | 18 ++++++++++++++++++
 2 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/libavutil/riscv/float_dsp_init.c b/libavutil/riscv/float_dsp_init.c
index de567c50d2..b829c0f736 100644
--- a/libavutil/riscv/float_dsp_init.c
+++ b/libavutil/riscv/float_dsp_init.c
@@ -28,12 +28,19 @@
 void ff_vector_fmul_scalar_rvv(float *dst, const float *src, float mul,
                                 int len);
 
+void ff_vector_dmul_scalar_rvv(double *dst, const double *src, double mul,
+                                int len);
+
 av_cold void ff_float_dsp_init_riscv(AVFloatDSPContext *fdsp)
 {
 #if HAVE_RVV
     int flags = av_get_cpu_flags();
 
-    if (flags & AV_CPU_FLAG_RV_ZVE32F)
+    if (flags & AV_CPU_FLAG_RV_ZVE32F) {
         fdsp->vector_fmul_scalar = ff_vector_fmul_scalar_rvv;
+
+        if (flags & AV_CPU_FLAG_RV_ZVE64D)
+            fdsp->vector_dmul_scalar = ff_vector_dmul_scalar_rvv;
+    }
 #endif
 }
diff --git a/libavutil/riscv/float_dsp_rvv.S b/libavutil/riscv/float_dsp_rvv.S
index 5095ed5bfc..e82d56ac15 100644
--- a/libavutil/riscv/float_dsp_rvv.S
+++ b/libavutil/riscv/float_dsp_rvv.S
@@ -38,3 +38,21 @@ NOHWF   mv       a2, a3
 
         ret
 endfunc
+
+// (a0) = (a1) * fa0 [0..a2-1]
+func ff_vector_dmul_scalar_rvv, zve64d
+NOHWD   fmv.d.x  fa0, a2
+NOHWD   mv       a2, a3
+1:
+        vsetvli  t0, a2, e64, m1, ta, ma
+        slli     t1, t0, 3
+        vle64.v  v16, (a1)
+        add      a1, a1, t1
+        vfmul.vf v16, v16, fa0
+        sub      a2, a2, t0
+        vse64.v  v16, (a0)
+        add      a0, a0, t1
+        bnez     a2, 1b
+
+        ret
+endfunc
-- 
2.37.2

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