Mesa (master): i965: Bail on FS copy propagation for scratch writes with source modifiers

[Anuj Phogat]

Module: Mesa
Branch: master
Commit: 9b9dd22f4448da6a6e825faaa40cd601b6fb2b59
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=9b9dd22f4448da6a6e825faaa40cd601b6fb2b59

Author: Anuj Phogat <anuj.phogat at gmail.com>
Date:   Mon Jul 28 19:27:59 2014 -0700

i965: Bail on FS copy propagation for scratch writes with source modifiers

Signed-off-by: Anuj Phogat <anuj.phogat at gmail.com>
Reviewed-by: Matt Turner <mattst88 at gmail.com>

---

 src/mesa/drivers/dri/i965/brw_fs_copy_propagation.cpp |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/brw_fs_copy_propagation.cpp b/src/mesa/drivers/dri/i965/brw_fs_copy_propagation.cpp
index 498e078..09f51bc 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_copy_propagation.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_copy_propagation.cpp
@@ -311,6 +311,10 @@ fs_visitor::try_copy_propagate(fs_inst *inst, int arg, acp_entry *entry)
        !inst->can_do_source_mods(brw))
       return false;
 
+   if (has_source_modifiers &&
+       inst->opcode == SHADER_OPCODE_GEN4_SCRATCH_WRITE)
+      return false;
+
    /* Bail if the result of composing both strides would exceed the
     * hardware limit.
     */