Added TGSI_OPCODE_END

Halt program execution when we get to END instruction.  The GLSL compiler
puts subroutines after the end instruction so we have to stop before then.

src/mesa/pipe/i915simple/i915_fpc_translate.c

@@ -486,6 +486,10 @@ i915_translate_instruction(struct i915_fp_compile *p,
                       swizzle(src1, ONE, Y, ONE, W), 0);
       break;
 
+   case TGSI_OPCODE_END:
+      /* no-op */
+      break;
+
    case TGSI_OPCODE_EX2:
       src0 = src_vector(p, &inst->FullSrcRegisters[0]);
 

src/mesa/pipe/tgsi/exec/tgsi_dump.c

@@ -363,7 +363,8 @@ static const char *TGSI_OPCODES[] =
    "OPCODE_CALLNZ",
    "OPCODE_IFC",
    "OPCODE_BREAKC",
-   "OPCODE_TXP"
+   "OPCODE_TXP",
+   "OPCODE_END"
 };
 
 static const char *TGSI_OPCODES_SHORT[] =
@@ -500,6 +501,8 @@ static const char *TGSI_OPCODES_SHORT[] =
    "CALLNZ",
    "IFC",
    "BREAKC",
+   "TXP",
+   "END"
 };
 
 static const char *TGSI_SATS[] =

src/mesa/pipe/tgsi/exec/tgsi_exec.c

@@ -2029,6 +2029,11 @@ exec_instruction(
       }
       break;
 
+   case TGSI_OPCODE_END:
+      /* halt execution */
+      *pc = -1;
+      break;
+
    case TGSI_OPCODE_ENDIF:
       /* pop CondMask */
       assert(mach->CondStackTop > 0);
@@ -2233,15 +2238,14 @@ tgsi_exec_machine_run( struct tgsi_exec_machine *mach )
 
    {
       uint i;
-      int pc;
+      int pc = 0;
 
       for (i = 0; i < mach->NumDeclarations; i++) {
          exec_declaration( mach, mach->Declarations+i );
       }
 
-      pc = 0;
-
-      while (pc != 99 && pc < mach->NumInstructions) {
+      while (pc != -1) {
+         assert(pc < mach->NumInstructions);
          exec_instruction( mach, mach->Instructions + pc, &pc );
       }
    }

src/mesa/pipe/tgsi/exec/tgsi_token.h

@@ -1100,7 +1100,9 @@ struct tgsi_immediate_float32
 /* TGSI_OPCODE_MOVA */
 /* TGSI_OPCODE_LOGP */
 
-#define TGSI_OPCODE_LAST                133
+#define TGSI_OPCODE_END                 133   /* aka HALT */
+
+#define TGSI_OPCODE_LAST                134
 
 #define TGSI_SAT_NONE            0  /* do not saturate */
 #define TGSI_SAT_ZERO_ONE        1  /* clamp to [0,1] */

src/mesa/pipe/tgsi/mesa/mesa_to_tgsi.c

@@ -154,7 +154,7 @@ convert_writemask(
    return writemask;
 }
 
-static GLboolean
+static void
 compile_instruction(
    const struct prog_instruction *inst,
    struct tgsi_full_instruction *fullinst,
@@ -460,12 +460,11 @@ compile_instruction(
       fulldst->DstRegister.WriteMask &= TGSI_WRITEMASK_XYZ;
       break;
    case OPCODE_END:
-      return GL_TRUE;
+      fullinst->Instruction.Opcode = TGSI_OPCODE_END;
+      break;
    default:
       assert( 0 );
    }
-
-   return GL_FALSE;
 }
 
 static struct tgsi_full_declaration
@@ -658,20 +657,13 @@ tgsi_mesa_compile_fp_program(
 #endif
 
    for( i = 0; i < program->Base.NumInstructions; i++ ) {
-      if( compile_instruction(
+      compile_instruction(
             &program->Base.Instructions[i],
             &fullinst,
             inputMapping,
             outputMapping,
             preamble_size,
-            TGSI_PROCESSOR_FRAGMENT ) ) {
-         assert( i == program->Base.NumInstructions - 1 );
-
-         if( TGSI_DEBUG ) {
-            tgsi_dump( tokens, 0 );
-         }
-         break;
-      }
+            TGSI_PROCESSOR_FRAGMENT );
 
       ti += tgsi_build_full_instruction(
          &fullinst,
@@ -741,20 +733,13 @@ tgsi_mesa_compile_vp_program(
 
 
    for( i = 0; i < program->Base.NumInstructions; i++ ) {
-      if( compile_instruction(
+      compile_instruction(
             &program->Base.Instructions[i],
             &fullinst,
             inputMapping,
             outputMapping,
             0,
-            TGSI_PROCESSOR_VERTEX ) ) {
-         assert( i == program->Base.NumInstructions - 1 );
-
-	 if( TGSI_DEBUG ) {
-            tgsi_dump( tokens, 0 );
-         }
-         break;
-      }
+            TGSI_PROCESSOR_VERTEX );
 
       ti += tgsi_build_full_instruction(
          &fullinst,