Silence some warnings

Change-Id: I8efb64eac3438484e7a77a8a1db198223fc52bfa

av1/encoder/mcomp.c

diff --git a/av1/encoder/mcomp.c b/av1/encoder/mcomp.c
index 9e63c0f..9ea9ede 100644
--- a/av1/encoder/mcomp.c
+++ b/av1/encoder/mcomp.c
@@ -2591,7 +2591,7 @@
   if (use_upsampled_ref)
     besterr = upsampled_setup_masked_center_error(
         xd, mask, mask_stride, bestmv, ref_mv, error_per_bit, vfp, z,
-        src_stride, y, y_stride, w, h, (offset << 3), mvjcost, mvcost, sse1,
+        src_stride, y, y_stride, w, h, (offset * 8), mvjcost, mvcost, sse1,
         distortion);
   else
     besterr = setup_masked_center_error(
@@ -3090,7 +3090,7 @@
   if (use_upsampled_ref)
     besterr = upsampled_setup_obmc_center_error(
         xd, mask, bestmv, ref_mv, error_per_bit, vfp, z, y, y_stride, w, h,
-        (offset << 3), mvjcost, mvcost, sse1, distortion);
+        (offset * 8), mvjcost, mvcost, sse1, distortion);
   else
     besterr = setup_obmc_center_error(mask, bestmv, ref_mv, error_per_bit, vfp,
                                       z, y, y_stride, offset, mvjcost, mvcost,

av1/encoder/rdopt.c

diff --git a/av1/encoder/rdopt.c b/av1/encoder/rdopt.c
index 2966e77..948995d 100644
--- a/av1/encoder/rdopt.c
+++ b/av1/encoder/rdopt.c
@@ -2713,7 +2713,7 @@
 #endif  // CONFIG_EXT_INTRA
     this_rd = RDCOST(x->rdmult, x->rddiv, this_rate, this_distortion);
 #if CONFIG_EXT_INTRA
-    if (best_rd == INT64_MAX || this_rd < (best_rd + (best_rd >> 4))) {
+    if (best_rd == INT64_MAX || this_rd - best_rd < (best_rd >> 4)) {
       filter_intra_mode_skip_mask ^= (1 << mic->mbmi.mode);
     }
 #endif  // CONFIG_EXT_INTRA
@@ -8958,7 +8958,7 @@
         backup_fmv[0] = frame_mv[NEWMV][ref_frame];
         if (comp_pred) backup_fmv[1] = frame_mv[NEWMV][second_ref_frame];
 
-        rate2 += cpi->drl_mode_cost0[drl_ctx][0];
+        rate2 += (rate2 < INT_MAX ? cpi->drl_mode_cost0[drl_ctx][0] : 0);
 
         if (this_rd < INT64_MAX) {
           if (RDCOST(x->rdmult, x->rddiv, rate_y + rate_uv, distortion2) <
@@ -9049,7 +9049,7 @@
             uint8_t drl1_ctx = 0;
             drl1_ctx = av1_drl_ctx(mbmi_ext->ref_mv_stack[ref_frame_type],
                                    i + idx_offset);
-            tmp_rate += cpi->drl_mode_cost0[drl1_ctx][1];
+            tmp_rate += (tmp_rate < INT_MAX ? cpi->drl_mode_cost0[drl1_ctx][1] : 0);
           }
 
           if (mbmi_ext->ref_mv_count[ref_frame_type] >

av1/encoder/temporal_filter.c

diff --git a/av1/encoder/temporal_filter.c b/av1/encoder/temporal_filter.c
index 909d539..dafb6ff 100644
--- a/av1/encoder/temporal_filter.c
+++ b/av1/encoder/temporal_filter.c
@@ -112,8 +112,8 @@
 
       for (idy = -1; idy <= 1; ++idy) {
         for (idx = -1; idx <= 1; ++idx) {
-          int row = i + idy;
-          int col = j + idx;
+          int row = (int)i + idy;
+          int col = (int)j + idx;
 
           if (row >= 0 && row < (int)block_height && col >= 0 &&
               col < (int)block_width) {