GEMV implementation

Signed-off-by: Amrita H S <[email protected]>

Author: amritahs-ibm

ggml/src/ggml-cpu/llamafile/sgemm.cpp

@@ -1435,7 +1435,7 @@ class tinyBLAS_PPC {
             switch(m_rem) {
                 case 1:
                     mc = 1;
-                    gemm_small(m0, m, n0, n, mc, nc);
+                    gemv(m0, m, n0, n, mc, nc);
                     break;
                 case 2:
                     mc = 2;
@@ -1453,7 +1453,7 @@ class tinyBLAS_PPC {
             switch(n_rem) {
                 case 1:
                     nc = 1;
-                    gemm_small(m0, m, n0, n, mc, nc);
+                    gemv(m0, m, n0, n, mc, nc);
                     break;
                 case 2:
                     nc = 2;
@@ -1481,7 +1481,7 @@ class tinyBLAS_PPC {
                 case 0x41:
                     mc = 4;
                     nc = 1;
-                    gemm_small(m0, m, n0, n, mc, nc);
+                    gemv(m0, m, n0, n, mc, nc);
                     break;
                 case 0x34:
                     mc = 3;
@@ -1501,7 +1501,7 @@ class tinyBLAS_PPC {
                 case 0x31:
                     mc = 3;
                     nc = 1;
-                    gemm_small(m0, m, n0, n, mc, nc);
+                    gemv(m0, m, n0, n, mc, nc);
                     break;
                 case 0x24:
                     mc = 2;
@@ -1521,27 +1521,27 @@ class tinyBLAS_PPC {
                 case 0x21:
                     mc = 2;
                     nc = 1;
-                    gemm_small(m0, m, n0, n, mc, nc);
+                    gemv(m0, m, n0, n, mc, nc);
                     break;
                 case 0x14:
                     mc = 1;
                     nc = 4;
-                    gemm_small(m0, m, n0, n, mc, nc);
+                    gemv(m0, m, n0, n, mc, nc);
                     break;
                 case 0x13:
                     mc = 1;
                     nc = 3;
-                    gemm_small(m0, m, n0, n, mc, nc);
+                    gemv(m0, m, n0, n, mc, nc);
                     break;
                 case 0x12:
                     mc = 1;
                     nc = 2;
-                    gemm_small(m0, m, n0, n, mc, nc);
+                    gemv(m0, m, n0, n, mc, nc);
                     break;
                 case 0x11:
                     mc = 1;
                     nc = 1;
-                    gemm_small(m0, m, n0, n, mc, nc);
+                    gemv(m0, m, n0, n, mc, nc);
                     break;
                 default:
                     return;
@@ -1595,6 +1595,53 @@ class tinyBLAS_PPC {
        }
     }
 
+     void gemv(int64_t m0, int64_t m, int64_t n0, int64_t n, int RM, int RN) {
+	//printf("In gemv, RM = %d, RN = %d \n", RM, RN);     
+        int64_t ytiles = (m - m0) / RM;
+        int64_t xtiles = (n - n0) / RN;
+        int64_t tiles = xtiles * ytiles;
+        int64_t duty = (tiles + nth - 1) / nth;
+        int64_t start = duty * ith;
+        int64_t end = start + duty;
+        if (end > tiles)
+            end = tiles;
+        for (int64_t job = start; job < end; ++job) {
+            int64_t ii = m0 + job / xtiles * RM;
+            int64_t jj = n0 + job % xtiles * RN;
+            vec_t vec_C[4];
+            acc_t acc_0;
+            __builtin_mma_xxsetaccz(&acc_0);
+            vec_t vec_A[4], vec_B[4];
+            for (int l=0; l<k; l+=4) {
+                if (RM == 1) {
+                    TA* a = const_cast<TA*>(A+(ii)*lda+l);
+                    packTranspose<vector float>(B+(jj*ldb)+l, ldb, RN, 4, (TA*)vec_B);
+                    vec_A[0] = (vec_t)vec_xl(0,a);
+                    vec_A[1] = (vec_t)vec_splats(*((TA*)&vec_A+1));
+                    vec_A[2] = (vec_t)vec_splats(*((TA*)&vec_A+2));
+                    vec_A[3] = (vec_t)vec_splats(*((TA*)&vec_A+3));
+                } else if (RN == 1) {
+                    packTranspose<vector float>(A+(ii*lda)+l, lda, RM, 4, (TA*)vec_A);
+                    TB* b = const_cast<TB*>(B+(jj)*ldb+l);
+                    vec_B[0] = (vec_t)vec_xl(0,b);
+                    vec_B[1] = (vec_t)vec_splats(*((TB*)&vec_B+1));
+                    vec_B[2] = (vec_t)vec_splats(*((TB*)&vec_B+2));
+                    vec_B[3] = (vec_t)vec_splats(*((TB*)&vec_B+3));
+                }
+                __builtin_mma_xvf32gerpp(&acc_0, vec_A[0], vec_B[0]);
+                __builtin_mma_xvf32gerpp(&acc_0, vec_A[1], vec_B[1]);
+                __builtin_mma_xvf32gerpp(&acc_0, vec_A[2], vec_B[2]);
+                __builtin_mma_xvf32gerpp(&acc_0, vec_A[3], vec_B[3]);
+            }
+            __builtin_mma_disassemble_acc(vec_C, &acc_0);
+            for (int I = 0; I < RM; I++) {
+                for (int J = 0; J < RN; J++) {
+                    *((TC*)(C+ii+((jj+J)*ldc)+I)) = *((TC*)&vec_C[I]+J);
+                }
+            }
+       }
+    }
+
     template <int RM, int RN>
     NOINLINE void gemm(int64_t m0, int64_t m, int64_t n0, int64_t n) {
         int64_t ytiles = (m - m0) / RM;
@@ -1680,9 +1727,10 @@ bool llamafile_sgemm(const struct ggml_compute_params * params, int64_t m, int64
     assert(params->ith < params->nth);
 
     // only enable sgemm for prompt processing
+#if !defined(__MMA__)
     if (n < 2)
         return false;
-
+#endif
     if (Ctype != GGML_TYPE_F32)
         return false;