diff --git a/tools/code_generators/GEN_AMD_switch_buffer_by_offset_le_S.pl b/tools/code_generators/GEN_AMD_switch_buffer_by_offset_le_S.pl
new file mode 100644
index 000000000..143342238
--- /dev/null
+++ b/tools/code_generators/GEN_AMD_switch_buffer_by_offset_le_S.pl
@@ -0,0 +1,27 @@
+#!/usr/bin/perl
+
+use strict;
+use warnings;
+
+for (my $i = 0, my $s = 0; $i < 64; $i++, $s++)
+{
+  printf ("    case %2d:\n", $i);
+
+  for (my $j = 64 - 1; $j >= 0; $j--)
+  {
+    if ((($j - $s - 1) >= 0) && (($j - $s - 0) >= 0))
+    {
+      printf ("      w[%2d] = amd_bytealign_S (w[%2d], w[%2d], offset_minus_4);\n", $j, $j - $s - 0, $j - $s - 1);
+    }
+    elsif (($j - $s - 0) >= 0)
+    {
+      printf ("      w[%2d] = amd_bytealign_S (w[%2d],     0, offset_minus_4);\n", $j, $j - $s - 0);
+    }
+    else
+    {
+      printf ("      w[%2d] = 0;\n", $j);
+    }
+  }
+
+  printf ("      break;\n");
+}
diff --git a/tools/code_generators/GEN_NV_switch_buffer_by_offset_le_S.pl b/tools/code_generators/GEN_NV_switch_buffer_by_offset_le_S.pl
new file mode 100644
index 000000000..c9228ce0a
--- /dev/null
+++ b/tools/code_generators/GEN_NV_switch_buffer_by_offset_le_S.pl
@@ -0,0 +1,27 @@
+#!/usr/bin/perl
+
+use strict;
+use warnings;
+
+for (my $i = 0, my $s = 0; $i < 64; $i++, $s++)
+{
+  printf ("    case %2d:\n", $i);
+
+  for (my $j = 64 - 1; $j >= 0; $j--)
+  {
+    if ((($j - $s - 1) >= 0) && (($j - $s - 0) >= 0))
+    {
+      printf ("      w[%2d] = __byte_perm_S (w[%2d], w[%2d], selector);\n", $j, $j - $s - 1, $j - $s - 0);
+    }
+    elsif (($j - $s - 0) >= 0)
+    {
+      printf ("      w[%2d] = __byte_perm_S (    0, w[%2d], selector);\n", $j, $j - $s - 0);
+    }
+    else
+    {
+      printf ("      w[%2d] = 0;\n", $j);
+    }
+  }
+
+  printf ("      break;\n");
+}