fontconfig libX11 libxcb libxcb/xcb-proto mesa xserver xkbcomp xkeyboard-config git update 29 Nov 2014

xserver          commit c52a2b1ebad56820af932dfbc871701a8b04fd9c
libxcb           commit bbca7b82f803fa13fd30a2891ec06f2a213a28c2
libxcb/xcb-proto commit 691d2b97e5989d6d7006304d81bd8fa128477ca1
xkeyboard-config commit b664d7fb8aab9b0f834dd9c81d273c7809561b34
libX11           commit f3831dde6972e4da9e018c6a5f4013d8756a5e78
xkbcomp          commit 1e8ee9d0aad072f04186df84752f5636340574e0
fontconfig       commit b732bf057f4b3ec3bac539803005e9c42d056b2a
mesa             commit 67c498086d0858a94d53ebb6921cfda847250368

1 files changed, 12 insertions, 1 deletions

diff --git a/mesalib/src/glsl/loop_unroll.cpp b/mesalib/src/glsl/loop_unroll.cpp
index ce795f6cd..635e1dd99 100644
--- a/mesalib/src/glsl/loop_unroll.cpp
+++ b/mesalib/src/glsl/loop_unroll.cpp
@@ -64,6 +64,7 @@ class loop_unroll_count : public ir_hierarchical_visitor {
 public:
    int nodes;
    bool unsupported_variable_indexing;
+   bool array_indexed_by_induction_var_with_exact_iterations;
    /* If there are nested loops, the node count will be inaccurate. */
    bool nested_loop;
 
@@ -74,6 +75,7 @@ public:
       nodes = 0;
       nested_loop = false;
       unsupported_variable_indexing = false;
+      array_indexed_by_induction_var_with_exact_iterations = false;
 
       run(list);
    }
@@ -112,6 +114,14 @@ public:
          ir_variable *array = ir->array->variable_referenced();
          loop_variable *lv = ls->get(ir->array_index->variable_referenced());
          if (array && lv && lv->is_induction_var()) {
+            /* If an array is indexed by a loop induction variable, and the
+             * array size is exactly the number of loop iterations, this is
+             * probably a simple for-loop trying to access each element in
+             * turn; the application may expect it to be unrolled.
+             */
+            if (int(array->type->length) == ls->limiting_terminator->iterations)
+               array_indexed_by_induction_var_with_exact_iterations = true;
+
             switch (array->data.mode) {
             case ir_var_auto:
             case ir_var_temporary:
@@ -314,7 +324,8 @@ loop_unroll_visitor::visit_leave(ir_loop *ir)
    bool loop_too_large =
       count.nested_loop || count.nodes * iterations > max_iterations * 5;
 
-   if (loop_too_large && !count.unsupported_variable_indexing)
+   if (loop_too_large && !count.unsupported_variable_indexing &&
+       !count.array_indexed_by_induction_var_with_exact_iterations)
       return visit_continue;
 
    /* Note: the limiting terminator contributes 1 to ls->num_loop_jumps.