Mesa (master): glsl: When assigning to a whole array, mark the array as accessed.

Eric Anholt anholt at kemper.freedesktop.org
Mon Aug 15 17:55:28 PDT 2011


Module: Mesa
Branch: master
Commit: a313c29c777de0bc74c252f1d35eef7d3d907e1f
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=a313c29c777de0bc74c252f1d35eef7d3d907e1f

Author: Eric Anholt <eric at anholt.net>
Date:   Fri Aug  5 21:40:50 2011 -0700

glsl: When assigning to a whole array, mark the array as accessed.

The vs-varying-array-mat2-col-row-wr test writes a mat2[3] constant to
a mat2[3] varying out array, and also statically accesses element 1 of
it on the VS and FS sides.  At link time it would get trimmed down to
just 2 elements, and then codegen of the VS would end up generating
assignments to the unallocated last entry of the array.  On the new
i965 VS backend, that happened to land on the vertex position.

Some issues remain in this test on softpipe, i965/old-vs and
i965/new-vs on visual inspection, but i965 is passing because only one
green pixel is probed, not the whole split green/red quad.

---

 src/glsl/ast_to_hir.cpp |   21 +++++++++++----------
 1 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/src/glsl/ast_to_hir.cpp b/src/glsl/ast_to_hir.cpp
index 2025911..9e7496b 100644
--- a/src/glsl/ast_to_hir.cpp
+++ b/src/glsl/ast_to_hir.cpp
@@ -653,6 +653,16 @@ validate_assignment(struct _mesa_glsl_parse_state *state,
    return NULL;
 }
 
+static void
+mark_whole_array_access(ir_rvalue *access)
+{
+   ir_dereference_variable *deref = access->as_dereference_variable();
+
+   if (deref && deref->var) {
+      deref->var->max_array_access = deref->type->length - 1;
+   }
+}
+
 ir_rvalue *
 do_assignment(exec_list *instructions, struct _mesa_glsl_parse_state *state,
 	      ir_rvalue *lhs, ir_rvalue *rhs, bool is_initializer,
@@ -713,6 +723,7 @@ do_assignment(exec_list *instructions, struct _mesa_glsl_parse_state *state,
 						   rhs->type->array_size());
 	 d->type = var->type;
       }
+      mark_whole_array_access(lhs);
    }
 
    /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
@@ -773,16 +784,6 @@ ast_node::hir(exec_list *instructions,
    return NULL;
 }
 
-static void
-mark_whole_array_access(ir_rvalue *access)
-{
-   ir_dereference_variable *deref = access->as_dereference_variable();
-
-   if (deref) {
-      deref->var->max_array_access = deref->type->length - 1;
-   }
-}
-
 static ir_rvalue *
 do_comparison(void *mem_ctx, int operation, ir_rvalue *op0, ir_rvalue *op1)
 {



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