Add MSA optimized HalfFloatRow function

TBR=kjellander@chromium.org
R=fbarchard@google.com

Bug:libyuv:634
Change-Id: I54a2c57d66093b887c8ba31fd7a21a102165393a
Reviewed-on: https://chromium-review.googlesource.com/628557Reviewed-by: Frank Barchard <fbarchard@google.com>

include/libyuv/row.h

@@ -424,6 +424,7 @@ extern "C" {
 #define HAS_ARGBEXTRACTALPHAROW_MSA
 #define HAS_SPLITUVROW_MSA
 #define HAS_MIRRORUVROW_MSA
+#define HAS_HALFFLOATROW_MSA
 
 #ifndef DISABLE_CLANG_MSA
 #define HAS_ABGRTOUVROW_MSA
@@ -3190,6 +3191,11 @@ void HalfFloat1Row_Any_NEON(const uint16* src,
                             uint16* dst,
                             float scale,
                             int width);
+void HalfFloatRow_MSA(const uint16* src, uint16* dst, float scale, int width);
+void HalfFloatRow_Any_MSA(const uint16* src,
+                          uint16* dst,
+                          float scale,
+                          int width);
 
 void ARGBLumaColorTableRow_C(const uint8* src_argb,
                              uint8* dst_argb,

source/planar_functions.cc

@@ -2941,6 +2941,14 @@ int HalfFloatPlane(const uint16* src_y,
     }
   }
 #endif
+#if defined(HAS_HALFFLOATROW_MSA)
+  if (TestCpuFlag(kCpuHasMSA)) {
+    HalfFloatRow = HalfFloatRow_Any_MSA;
+    if (IS_ALIGNED(width, 32)) {
+      HalfFloatRow = HalfFloatRow_MSA;
+    }
+  }
+#endif
 
   for (y = 0; y < height; ++y) {
     HalfFloatRow(src_y, dst_y, scale, width);

source/row_any.cc

@@ -749,6 +749,9 @@ ANY11P16(HalfFloat1Row_Any_F16C, HalfFloat1Row_F16C, float, 2, 2, 15)
 ANY11P16(HalfFloatRow_Any_NEON, HalfFloatRow_NEON, float, 2, 2, 7)
 ANY11P16(HalfFloat1Row_Any_NEON, HalfFloat1Row_NEON, float, 2, 2, 7)
 #endif
+#ifdef HAS_HALFFLOATROW_MSA
+ANY11P16(HalfFloatRow_Any_MSA, HalfFloatRow_MSA, float, 2, 2, 31)
+#endif
 #undef ANY11P16
 
 // Any 1 to 1 with yuvconstants

source/row_msa.cc

@@ -3458,6 +3458,64 @@ void SobelYRow_MSA(const uint8* src_y0,
 }
 #endif
 
+void HalfFloatRow_MSA(const uint16* src, uint16* dst, float scale, int width) {
+  int i;
+  v8u16 src0, src1, src2, src3, dst0, dst1, dst2, dst3;
+  v4u32 vec0, vec1, vec2, vec3, vec4, vec5, vec6, vec7;
+  v4f32 fvec0, fvec1, fvec2, fvec3, fvec4, fvec5, fvec6, fvec7;
+  v4f32 mult_vec;
+  v8i16 zero = {0};
+  mult_vec[0] = 1.9259299444e-34f * scale;
+  mult_vec = (v4f32)__msa_splati_w((v4i32)mult_vec, 0);
+
+  for (i = 0; i < width; i += 32) {
+    src0 = (v8u16)__msa_ld_h((v8i16*)src, 0);
+    src1 = (v8u16)__msa_ld_h((v8i16*)src, 16);
+    src2 = (v8u16)__msa_ld_h((v8i16*)src, 32);
+    src3 = (v8u16)__msa_ld_h((v8i16*)src, 48);
+    vec0 = (v4u32)__msa_ilvr_h(zero, (v8i16)src0);
+    vec1 = (v4u32)__msa_ilvl_h(zero, (v8i16)src0);
+    vec2 = (v4u32)__msa_ilvr_h(zero, (v8i16)src1);
+    vec3 = (v4u32)__msa_ilvl_h(zero, (v8i16)src1);
+    vec4 = (v4u32)__msa_ilvr_h(zero, (v8i16)src2);
+    vec5 = (v4u32)__msa_ilvl_h(zero, (v8i16)src2);
+    vec6 = (v4u32)__msa_ilvr_h(zero, (v8i16)src3);
+    vec7 = (v4u32)__msa_ilvl_h(zero, (v8i16)src3);
+    fvec0 = __msa_ffint_u_w(vec0);
+    fvec1 = __msa_ffint_u_w(vec1);
+    fvec2 = __msa_ffint_u_w(vec2);
+    fvec3 = __msa_ffint_u_w(vec3);
+    fvec4 = __msa_ffint_u_w(vec4);
+    fvec5 = __msa_ffint_u_w(vec5);
+    fvec6 = __msa_ffint_u_w(vec6);
+    fvec7 = __msa_ffint_u_w(vec7);
+    fvec0 *= mult_vec;
+    fvec1 *= mult_vec;
+    fvec2 *= mult_vec;
+    fvec3 *= mult_vec;
+    fvec4 *= mult_vec;
+    fvec5 *= mult_vec;
+    fvec6 *= mult_vec;
+    fvec7 *= mult_vec;
+    vec0 = ((v4u32)fvec0) >> 13;
+    vec1 = ((v4u32)fvec1) >> 13;
+    vec2 = ((v4u32)fvec2) >> 13;
+    vec3 = ((v4u32)fvec3) >> 13;
+    vec4 = ((v4u32)fvec4) >> 13;
+    vec5 = ((v4u32)fvec5) >> 13;
+    vec6 = ((v4u32)fvec6) >> 13;
+    vec7 = ((v4u32)fvec7) >> 13;
+    dst0 = (v8u16)__msa_pckev_h((v8i16)vec1, (v8i16)vec0);
+    dst1 = (v8u16)__msa_pckev_h((v8i16)vec3, (v8i16)vec2);
+    dst2 = (v8u16)__msa_pckev_h((v8i16)vec5, (v8i16)vec4);
+    dst3 = (v8u16)__msa_pckev_h((v8i16)vec7, (v8i16)vec6);
+    ST_UH2(dst0, dst1, dst, 8);
+    ST_UH2(dst2, dst3, dst + 16, 8);
+    src += 32;
+    dst += 32;
+  }
+}
+
 #ifdef __cplusplus
 }  // extern "C"
 }  // namespace libyuv