d3dx9: Return correct comment length from get_instr_length().

dlls/d3dx9_36/shader.c

@@ -2415,18 +2415,20 @@ HRESULT WINAPI D3DXCreateTextureShader(const DWORD *function, ID3DXTextureShader
 
 static unsigned int get_instr_length(const DWORD *byte_code, unsigned int major, unsigned int minor)
 {
+    DWORD opcode = *byte_code & 0xffff;
     unsigned int len = 0;
 
+    if (opcode == D3DSIO_COMMENT)
+        return (*byte_code & D3DSI_COMMENTSIZE_MASK) >> D3DSI_COMMENTSIZE_SHIFT;
+
     if (major > 1)
         return (*byte_code & D3DSI_INSTLENGTH_MASK) >> D3DSI_INSTLENGTH_SHIFT;
 
-    switch (*byte_code & 0xffff)
+    switch (opcode)
     {
         case D3DSIO_END:
             ERR("Unexpected END token.\n");
             return 0;
-        case D3DSIO_COMMENT:
-            return (*byte_code & D3DSI_COMMENTSIZE_MASK) >> D3DSI_COMMENTSIZE_SHIFT;
         case D3DSIO_DEF:
         case D3DSIO_DEFI:
             return 5;

dlls/d3dx9_36/tests/shader.c

@@ -6457,6 +6457,7 @@ static void test_shader_semantics(void)
     vs_3_0[] =
     {
         0xfffe0300,                         /* vs_3_0 */
+        0x0002fffe, 0x0200000f, 0x00000000, /* comment */
         0x0200001f, 0x80000000, 0x900f0000, /* dcl_position v0 */
         0x0200001f, 0x80000003, 0x900f0001, /* dcl_normal v1 */
         0x0200001f, 0x8001000a, 0x900f0002, /* dcl_color1 v2 */