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-rw-r--r--src/mesa/drivers/dri/r300/compiler/radeon_emulate_loops.c37
1 files changed, 33 insertions, 4 deletions
diff --git a/src/mesa/drivers/dri/r300/compiler/radeon_emulate_loops.c b/src/mesa/drivers/dri/r300/compiler/radeon_emulate_loops.c
index 859023a4d8b..28b9684e82d 100644
--- a/src/mesa/drivers/dri/r300/compiler/radeon_emulate_loops.c
+++ b/src/mesa/drivers/dri/r300/compiler/radeon_emulate_loops.c
@@ -297,10 +297,31 @@ static int transform_const_loop(struct emulate_loop_state * s,
/* Remove the first 4 instructions inside the loop, which are part
* of the conditional and no longer needed.
*/
- rc_remove_instruction(loop->BeginLoop->Next); /* SLT/SGE */
- rc_remove_instruction(loop->BeginLoop->Next); /* IF */
- rc_remove_instruction(loop->BeginLoop->Next); /* BRK */
- rc_remove_instruction(loop->BeginLoop->Next); /* ENDIF */
+ /* SLT/SGE */
+ if(loop->BeginLoop->Next->U.I.Opcode != RC_OPCODE_SLT &&
+ loop->BeginLoop->Next->U.I.Opcode != RC_OPCODE_SGE){
+ rc_error(s->C,"Unexpected instruction, expected SLT/SGE\n");
+ return 0;
+ }
+ /* IF */
+ rc_remove_instruction(loop->BeginLoop->Next);
+ if(loop->BeginLoop->Next->U.I.Opcode != RC_OPCODE_IF){
+ rc_error(s->C,"Unexpected instruction, expected IF\n");
+ return 0;
+ }
+ rc_remove_instruction(loop->BeginLoop->Next);
+ /* BRK */
+ if(loop->BeginLoop->Next->U.I.Opcode != RC_OPCODE_BRK){
+ rc_error(s->C,"Unexpected instruction, expected BRK\n");
+ return 0;
+ }
+ rc_remove_instruction(loop->BeginLoop->Next);
+ /* ENDIF */
+ if(loop->BeginLoop->Next->U.I.Opcode != RC_OPCODE_ENDIF){
+ rc_error(s->C,"Unexpected instruction, expected ENDIF\n");
+ return 0;
+ }
+ rc_remove_instruction(loop->BeginLoop->Next);
loop_unroll(s, loop, iterations);
loop->EndLoop = NULL;
@@ -343,6 +364,10 @@ static struct rc_instruction * transform_loop(struct emulate_loop_state * s,
case RC_OPCODE_SLT:
ptr->U.I.Opcode = RC_OPCODE_SGE;
break;
+ default:
+ rc_error(s->C,
+ "Loop does not start with a conditional instruction.");
+ break;
}
/* Check if the number of loops is known at compile time. */
@@ -363,6 +388,10 @@ static struct rc_instruction * transform_loop(struct emulate_loop_state * s,
/* The BRK instruction should always be followed by
* an ENDIF. This ENDIF will eventually replace the
* ENDLOOP insruction. */
+ if(ptr->Next->U.I.Opcode != RC_OPCODE_ENDIF){
+ rc_error(s->C,
+ "transform_loop: expected ENDIF\n");
+ }
endif = ptr->Next;
rc_remove_instruction(ptr);
rc_remove_instruction(endif);