i965: Use _mesa_num_inst_src_regs() instead of keeping a copy of its contents.

src/mesa/drivers/dri/i965/brw_wm.c

@@ -40,62 +40,20 @@
 GLuint brw_wm_nr_args( GLuint opcode )
 {
    switch (opcode) {
-
    case WM_PIXELXY:
-   case OPCODE_ABS:
-   case OPCODE_FLR:
-   case OPCODE_FRC:
-   case OPCODE_SWZ:
-   case OPCODE_MOV:
-   case OPCODE_COS:
-   case OPCODE_EX2:
-   case OPCODE_LG2:
-   case OPCODE_RCP:
-   case OPCODE_RSQ:
-   case OPCODE_SIN:
-   case OPCODE_SCS:
-   case OPCODE_TEX:
-   case OPCODE_TXB:
-   case OPCODE_TXP:	
-   case OPCODE_KIL:
-   case OPCODE_LIT: 
-   case OPCODE_NRM3:
-   case OPCODE_NRM4:
-   case WM_CINTERP: 
-   case WM_WPOSXY: 
+   case WM_CINTERP:
+   case WM_WPOSXY:
       return 1;
-
-   case OPCODE_POW:
-   case OPCODE_SUB:
-   case OPCODE_SGE:
-   case OPCODE_SGT:
-   case OPCODE_SLE:
-   case OPCODE_SLT:
-   case OPCODE_SEQ:
-   case OPCODE_SNE:
-   case OPCODE_ADD:
-   case OPCODE_MAX:
-   case OPCODE_MIN:
-   case OPCODE_MUL:
-   case OPCODE_XPD:
-   case OPCODE_DP3:	
-   case OPCODE_DP4:
-   case OPCODE_DPH:
-   case OPCODE_DST:
-   case WM_LINTERP: 
+   case WM_LINTERP:
    case WM_DELTAXY:
    case WM_PIXELW:
       return 2;
-
    case WM_FB_WRITE:
-   case WM_PINTERP: 
-   case OPCODE_MAD:	
-   case OPCODE_CMP:
-   case OPCODE_LRP:
+   case WM_PINTERP:
       return 3;
-      
    default:
-      return 0;
+      assert(opcode < MAX_OPCODE);
+      return _mesa_num_inst_src_regs(opcode);
    }
 }