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glsl_to_tgsi: improve assignment handling

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This is a hack, but it's better than emitting an unnecessary MOV instruction
and hoping the optimization passes clean it up.
This commit is contained in:
Bryan Cain 2011-06-27 17:11:07 -05:00
parent 71cbc9e3c4
commit f00406b68c
1 changed files with 14 additions and 3 deletions
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17
src/mesa/state_tracker/st_glsl_to_tgsi.cpp
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@ -695,13 +695,13 @@ glsl_to_tgsi_visitor::emit_arl(ir_instruction *ir,
st_src_reg tmp = get_temp(glsl_type::float_type);
if (src0.type == GLSL_TYPE_INT)
emit(ir, TGSI_OPCODE_I2F, st_dst_reg(tmp), src0);
emit(NULL, TGSI_OPCODE_I2F, st_dst_reg(tmp), src0);
else if (src0.type == GLSL_TYPE_UINT)
emit(ir, TGSI_OPCODE_U2F, st_dst_reg(tmp), src0);
emit(NULL, TGSI_OPCODE_U2F, st_dst_reg(tmp), src0);
else
tmp = src0;
emit(ir, TGSI_OPCODE_ARL, dst, tmp);
emit(NULL, TGSI_OPCODE_ARL, dst, tmp);
}
/**
@ -1902,6 +1902,17 @@ glsl_to_tgsi_visitor::visit(ir_assignment *ir)
l.index++;
r.index++;
}
} else if (ir->rhs->as_expression() &&
this->instructions.get_tail() &&
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.
*/
glsl_to_tgsi_instruction *inst;
inst = (glsl_to_tgsi_instruction *)this->instructions.get_tail();
inst->dst = l;
} else {
for (i = 0; i < type_size(ir->lhs->type); i++) {
emit(ir, TGSI_OPCODE_MOV, l, r);