Shared variables can be accessed by other threads within the same
local workgroup. This prevents us from performing certain
optimizations with shared variables.
Signed-off-by: Jordan Justen <jordan.l.jus...@intel.com>
---
src/glsl/opt_constant_propagation.cpp | 3 ++-
src/glsl/opt_constant_variable.cpp | 3 ++-
src/glsl/opt_copy_propagation.cpp | 3 ++-
3 files changed, 6 insertions(+), 3 deletions(-)
diff --git a/src/glsl/opt_constant_propagation.cpp
b/src/glsl/opt_constant_propagation.cpp
index 184aaa1..fb24a4f 100644
--- a/src/glsl/opt_constant_propagation.cpp
+++ b/src/glsl/opt_constant_propagation.cpp
@@ -500,7 +500,8 @@ ir_constant_propagation_visitor::add_constant(ir_assignment
*ir)
* the variable value isn't modified between this assignment and the next
* instruction where its value is read.
*/
- if (deref->var->data.mode == ir_var_shader_storage)
+ if (deref->var->data.mode == ir_var_shader_storage ||
+ deref->var->data.mode == ir_var_shader_shared)
return;
entry = new(this->mem_ctx) acp_entry(deref->var, ir->write_mask, constant);
diff --git a/src/glsl/opt_constant_variable.cpp
b/src/glsl/opt_constant_variable.cpp
index cdfbc34..56f6a81 100644
--- a/src/glsl/opt_constant_variable.cpp
+++ b/src/glsl/opt_constant_variable.cpp
@@ -120,7 +120,8 @@ ir_constant_variable_visitor::visit_enter(ir_assignment *ir)
* and we can't be sure that this variable won't be written by another
* thread.
*/
- if (var->data.mode == ir_var_shader_storage)
+ if (var->data.mode == ir_var_shader_storage ||
+ var->data.mode == ir_var_shader_shared)
return visit_continue;
constval = ir->rhs->constant_expression_value();
diff --git a/src/glsl/opt_copy_propagation.cpp
b/src/glsl/opt_copy_propagation.cpp
index f206995..5d4cb4f 100644
--- a/src/glsl/opt_copy_propagation.cpp
+++ b/src/glsl/opt_copy_propagation.cpp
@@ -330,7 +330,8 @@ 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) {
+ } else if (lhs_var->data.mode != ir_var_shader_storage &&
+ lhs_var->data.mode != ir_var_shader_shared) {
entry = new(this->acp) acp_entry(lhs_var, rhs_var);
this->acp->push_tail(entry);
}
--
2.6.2
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