glsl: When we've emitted a semantic error for ==, return a bool constant.

This prevents later errors (including an assertion failure) from
cascading the failure.

Fixes invalid-equality-04.vert.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=33303
Reviewed-by: Kenneth Graunke <[email protected]>
Reviewed-by: Chad Versace <[email protected]>

1 files changed, 7 insertions, 3 deletions

diff --git a/src/glsl/ast_to_hir.cpp b/src/glsl/ast_to_hir.cpp
index 108c7c35d37..ea20ebae114 100644
--- a/src/glsl/ast_to_hir.cpp
+++ b/src/glsl/ast_to_hir.cpp
@@ -1073,10 +1073,14 @@ ast_expression::hir(exec_list *instructions,
 	 error_emitted = true;
       }
 
-      result = do_comparison(ctx, operations[this->oper], op[0], op[1]);
-      type = glsl_type::bool_type;
+      if (error_emitted) {
+	 result = new(ctx) ir_constant(false);
+      } else {
+	 result = do_comparison(ctx, operations[this->oper], op[0], op[1]);
+	 assert(result->type == glsl_type::bool_type);
+	 type = glsl_type::bool_type;
+      }
 
-      assert(error_emitted || (result->type == glsl_type::bool_type));
       break;
 
    case ast_bit_and: