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glsl_to_tgsi: make assignment hack safer

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Fixes an assertion failure in piglit test glsl-texcoord-array.
This commit is contained in:
Bryan Cain 2011-07-21 16:29:56 -05:00
parent 7732822c83
commit 0da994a9f1
1 changed files with 4 additions and 3 deletions
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7
src/mesa/state_tracker/st_glsl_to_tgsi.cpp
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@ -1917,12 +1917,13 @@ glsl_to_tgsi_visitor::visit(ir_assignment *ir)
ir->rhs == ((glsl_to_tgsi_instruction *)this->instructions.get_tail())->ir &&
type_size(ir->lhs->type) == 1) {
/* To avoid emitting an extra MOV when assigning an expression to a
* variable, change the destination register of the last instruction
* emitted as part of the expression to the assignment variable.
* variable, emit the last instruction of the expression again, but
* replace the destination register with the target of the assignment.
* Dead code elimination will remove the original instruction.
*/
glsl_to_tgsi_instruction *inst;
inst = (glsl_to_tgsi_instruction *)this->instructions.get_tail();
inst->dst = l;
emit(ir, inst->op, l, inst->src[0], inst->src[1], inst->src[2]);
} else {
for (i = 0; i < type_size(ir->lhs->type); i++) {
emit(ir, TGSI_OPCODE_MOV, l, r);