Commit 95d622e1 authored by Kenneth Graunke's avatar Kenneth Graunke

glsl: Don't copy propagate or tree graft precise values.

This is kind of a hack.  We currently track precise requirements
by decorating ir_variables.  Propagating or grafting the RHS of an
assignment to a precise value into some other expression tree can
lose those decorations.

In the long run, it might be better to replace these ir_variable
decorations with an "exact" decoration on ir_expression nodes,
similar to what NIR does.

In the short run, this is probably good enough.  It preserves
enough information for glsl_to_nir to generate "exact" decorations,
and NIR will then handle optimizing these expressions reasonably.

Fixes ES31-CTS.gpu_shader5.precise_qualifier.

v2: Drop invariant handling, as it shouldn't be necessary (caught
    by Jason Ekstrand).
Signed-off-by: default avatarKenneth Graunke <kenneth@whitecape.org>
Reviewed-by: default avatarJason Ekstrand <jason@jlekstrand.net>
parent 8ec971a9
......@@ -331,7 +331,8 @@ ir_copy_propagation_visitor::add_copy(ir_assignment *ir)
ir->condition = new(ralloc_parent(ir)) ir_constant(false);
this->progress = true;
} else if (lhs_var->data.mode != ir_var_shader_storage &&
lhs_var->data.mode != ir_var_shader_shared) {
lhs_var->data.mode != ir_var_shader_shared &&
lhs_var->data.precise == rhs_var->data.precise) {
entry = new(this->acp) acp_entry(lhs_var, rhs_var);
this->acp->push_tail(entry);
}
......
......@@ -493,6 +493,9 @@ ir_copy_propagation_elements_visitor::add_copy(ir_assignment *ir)
}
}
if (lhs->var->data.precise != rhs->var->data.precise)
return;
entry = new(this->mem_ctx) acp_entry(lhs->var, rhs->var, write_mask,
swizzle);
this->acp->push_tail(entry);
......
......@@ -368,6 +368,9 @@ tree_grafting_basic_block(ir_instruction *bb_first,
lhs_var->data.mode == ir_var_shader_shared)
continue;
if (lhs_var->data.precise)
continue;
ir_variable_refcount_entry *entry = info->refs->get_variable_entry(lhs_var);
if (!entry->declaration ||
......
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