glsl/lower_output_reads: set invariant and precise flags on temporaries

fixes a couple of deqp tests (on nvc0 and potential other drivers):
dEQP-GLES3.functional.shaders.invariance.highp.common_subexpression_1
dEQP-GLES3.functional.shaders.invariance.highp.common_subexpression_2
dEQP-GLES3.functional.shaders.invariance.highp.common_subexpression_3
dEQP-GLES3.functional.shaders.invariance.mediump.common_subexpression_1
dEQP-GLES3.functional.shaders.invariance.mediump.common_subexpression_2
dEQP-GLES3.functional.shaders.invariance.mediump.common_subexpression_3
dEQP-GLES3.functional.shaders.invariance.lowp.common_subexpression_1
dEQP-GLES3.functional.shaders.invariance.lowp.common_subexpression_2
dEQP-GLES3.functional.shaders.invariance.lowp.common_subexpression_3

CC: <[email protected]>
Signed-off-by: Karol Herbst <[email protected]>
Reviewed-by: Ilia Mirkin <[email protected]>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/compiler/glsl/lower_output_reads.cpp b/src/compiler/glsl/lower_output_reads.cpp
index bd3accb3dda..4f90c7385ad 100644
--- a/src/compiler/glsl/lower_output_reads.cpp
+++ b/src/compiler/glsl/lower_output_reads.cpp
@@ -101,6 +101,10 @@ output_read_remover::visit(ir_dereference_variable *ir)
       void *var_ctx = ralloc_parent(ir->var);
       temp = new(var_ctx) ir_variable(ir->var->type, ir->var->name,
                                       ir_var_temporary);
+      /* copy flags which affect arithematical precision */
+      temp->data.invariant = ir->var->data.invariant;
+      temp->data.precise = ir->var->data.precise;
+      temp->data.precision = ir->var->data.precision;
       _mesa_hash_table_insert(replacements, ir->var, temp);
       ir->var->insert_after(temp);
    }