diff --git a/internal/ceres/benchmarks/macbook-pro-2014-small_blas_gemv_benchmark.json b/internal/ceres/benchmarks/macbook-pro-2014-small_blas_gemv_benchmark.json
index 1798ccb..3e483a2 100644
--- a/internal/ceres/benchmarks/macbook-pro-2014-small_blas_gemv_benchmark.json
+++ b/internal/ceres/benchmarks/macbook-pro-2014-small_blas_gemv_benchmark.json
@@ -1,6 +1,6 @@
 {
   "context": {
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+    "date": "2018-02-25 13:20:04",
     "num_cpus": 8,
     "mhz_per_cpu": 2200,
     "cpu_scaling_enabled": false,
@@ -9,506 +9,506 @@
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+      "iterations": 10179301,
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     {
       "name": "BM_MatrixTransposeVectorMultiply/3/1",
-      "iterations": 45903445,
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-      "cpu_time": 1.5023186168271270e+01,
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+      "cpu_time": 1.0183404780826111e+01,
       "time_unit": "ns"
     },
     {
       "name": "BM_MatrixTransposeVectorMultiply/3/2",
-      "iterations": 38719384,
-      "real_time": 1.8626934482269160e+01,
-      "cpu_time": 1.8326117998158196e+01,
+      "iterations": 48687523,
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+      "cpu_time": 1.4368362917127623e+01,
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     {
       "name": "BM_MatrixTransposeVectorMultiply/3/3",
-      "iterations": 32912833,
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-      "cpu_time": 2.0909078230974622e+01,
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     {
       "name": "BM_MatrixTransposeVectorMultiply/3/4",
-      "iterations": 36580841,
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     {
       "name": "BM_MatrixTransposeVectorMultiply/3/6",
-      "iterations": 27507181,
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     {
       "name": "BM_MatrixTransposeVectorMultiply/3/7",
-      "iterations": 25641026,
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     {
       "name": "BM_MatrixTransposeVectorMultiply/3/12",
-      "iterations": 21857104,
-      "real_time": 2.9318980271296027e+01,
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     {
       "name": "BM_MatrixTransposeVectorMultiply/3/16",
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     {
       "name": "BM_MatrixTransposeVectorMultiply/3/20",
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     {
       "name": "BM_MatrixTransposeVectorMultiply/4/1",
-      "iterations": 41598327,
-      "real_time": 1.7972290135515205e+01,
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+      "iterations": 68685362,
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       "time_unit": "ns"
     },
     {
       "name": "BM_MatrixTransposeVectorMultiply/4/2",
-      "iterations": 34202734,
-      "real_time": 2.2089604240919805e+01,
-      "cpu_time": 2.1759722483003841e+01,
+      "iterations": 41396113,
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+      "cpu_time": 1.6629145833088174e+01,
       "time_unit": "ns"
     },
     {
       "name": "BM_MatrixTransposeVectorMultiply/4/3",
-      "iterations": 27249123,
-      "real_time": 2.6488586586931632e+01,
-      "cpu_time": 2.6050122787437939e+01,
+      "iterations": 35592798,
+      "real_time": 2.0520861720163161e+01,
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       "time_unit": "ns"
     },
     {
       "name": "BM_MatrixTransposeVectorMultiply/4/4",
-      "iterations": 30863381,
-      "real_time": 2.4542076224741049e+01,
-      "cpu_time": 2.4055303597489978e+01,
+      "iterations": 29245508,
+      "real_time": 2.4356611964112989e+01,
+      "cpu_time": 2.4129585986333215e+01,
       "time_unit": "ns"
     },
     {
       "name": "BM_MatrixTransposeVectorMultiply/4/6",
-      "iterations": 23214321,
-      "real_time": 3.1091653333839805e+01,
-      "cpu_time": 3.0791294735693508e+01,
+      "iterations": 20036065,
+      "real_time": 3.4106466514085753e+01,
+      "cpu_time": 3.3619725230478345e+01,
       "time_unit": "ns"
     },
     {
       "name": "BM_MatrixTransposeVectorMultiply/4/7",
-      "iterations": 21214950,
-      "real_time": 3.3605207788356317e+01,
-      "cpu_time": 3.3319333771703114e+01,
+      "iterations": 18768417,
+      "real_time": 3.6661212077921938e+01,
+      "cpu_time": 3.6314090847405801e+01,
       "time_unit": "ns"
     },
     {
       "name": "BM_MatrixTransposeVectorMultiply/4/12",
-      "iterations": 21109771,
-      "real_time": 3.4236321416005268e+01,
-      "cpu_time": 3.3933669863117345e+01,
+      "iterations": 11789871,
+      "real_time": 6.1986798330774114e+01,
+      "cpu_time": 6.1171322400389727e+01,
       "time_unit": "ns"
     },
     {
       "name": "BM_MatrixTransposeVectorMultiply/4/16",
-      "iterations": 17775521,
-      "real_time": 3.9990263516471948e+01,
-      "cpu_time": 3.9692563722886177e+01,
+      "iterations": 7869236,
+      "real_time": 8.5527959635890710e+01,
+      "cpu_time": 8.2749964545479799e+01,
       "time_unit": "ns"
     },
     {
       "name": "BM_MatrixTransposeVectorMultiply/4/20",
-      "iterations": 14255226,
-      "real_time": 5.0482404275173749e+01,
-      "cpu_time": 4.9507808574903912e+01,
+      "iterations": 7417847,
+      "real_time": 9.9073482499474821e+01,
+      "cpu_time": 9.7701125407411183e+01,
       "time_unit": "ns"
     }
   ]
diff --git a/internal/ceres/small_blas.h b/internal/ceres/small_blas.h
index 9e15b5e..2d050d3 100644
--- a/internal/ceres/small_blas.h
+++ b/internal/ceres/small_blas.h
@@ -309,8 +309,8 @@
 
   for (int row = 0; row < NUM_ROW_A; ++row) {
     double tmp = 0.0;
-    for (int col = 0; col < NUM_COL_A; ++col, ++A) {
-      tmp += (*A) * b[col];
+    for (int col = 0; col < NUM_COL_A; ++col) {
+      tmp += A[row * NUM_COL_A + col] * b[col];
     }
 
     if (kOperation > 0) {
@@ -358,19 +358,18 @@
   const int NUM_ROW_A = (kRowA != Eigen::Dynamic ? kRowA : num_row_a);
   const int NUM_COL_A = (kColA != Eigen::Dynamic ? kColA : num_col_a);
 
+  for (int row = 0; row < NUM_COL_A; ++row) {
+    double tmp = 0.0;
+    for (int col = 0; col < NUM_ROW_A; ++col) {
+      tmp += A[col * NUM_COL_A + row] * b[col];
+    }
 
-  if (kOperation == 0) {
-    std::fill(c, c + NUM_COL_A, 0.0);
-  }
-
-  for (int row = 0; row < NUM_ROW_A; ++row) {
-    const double tmp = b[row];
-    for (int col = 0; col < NUM_COL_A; ++col, ++A) {
-      if (kOperation >= 0) {
-        c[col] += (*A) * tmp;
-      } else {
-        c[col] -= (*A) * tmp;
-      }
+    if (kOperation > 0) {
+      c[row] += tmp;
+    } else if (kOperation < 0) {
+      c[row] -= tmp;
+    } else {
+      c[row] = tmp;
     }
   }
 #endif  // CERES_NO_CUSTOM_BLAS