fix repeated_fc_fuse_pass and jit::matmul bug test=develop test=release/1.6 (#20948)

- fix jit::matmul bug 

input x, shape(m, k), weight, shape(k, n)

Author: jiweibo

paddle/fluid/operators/jit/gen/matmul.cc

@@ -40,7 +40,12 @@ void MatMulJitCode::genCode() {
   size_t wgt_offset = 0;
   for (size_t g = 0; g < groups.size(); ++g) {
     size_t x_offset = 0;
+    size_t wgt_offset_tmp = 0;
+    for (int i = 0; i < g; ++i) {
+      wgt_offset_tmp += groups[i] * block_len;
+    }
     for (int k = 0; k < k_; ++k) {
+      wgt_offset = wgt_offset_tmp;
       vbroadcastss(zmm_t(x_reg_idx), ptr[param_x + x_offset]);
       // clean
       if (k == 0) {
@@ -49,7 +54,8 @@ void MatMulJitCode::genCode() {
         }
       }
       for (int i = 0; i < groups[g]; ++i) {
-        vmovups(zmm_t(w_reg_idx), ptr[reg_ptr_wgt + wgt_offset]);
+        vmovups(zmm_t(w_reg_idx),
+                ptr[reg_ptr_wgt + wgt_offset + k * n_ * sizeof(float)]);
         vfmadd231ps(zmm_t(i), zmm_t(w_reg_idx), zmm_t(x_reg_idx));
         wgt_offset += block_len;
       }

python/paddle/fluid/tests/unittests/test_fusion_repeated_fc_relu_op.py

@@ -78,7 +78,7 @@ def set_conf(self):
 class TestFusionRepeatedFCReluOpBS1(TestFusionRepeatedFCReluOp):
     def set_conf(self):
         self.bs = 1
-        self.oc = [4, 2, 7, 5]
+        self.oc = [4, 2, 7, 5, 512, 1024]
 
 
 if __name__ == '__main__':