Mesa (master): anv: Add a new block-based batch emit macro

[Jason Ekstrand]

Module: Mesa
Branch: master
Commit: 64ad2d3bcd9bcbb49ef3840446f560e0f11a1f70
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=64ad2d3bcd9bcbb49ef3840446f560e0f11a1f70

Author: Jason Ekstrand <jason.ekstrand at intel.com>
Date:   Mon Apr 18 14:25:03 2016 -0700

anv: Add a new block-based batch emit macro

This new macro uses a for loop to create an actual code block in which to
place the macro setup code.  One advantage of this is that you syntatically
use braces instead of parentheses.  Another is that the code in the block
doesn't even get executed if anv_batch_emit_dwords fails.

Acked-by: Kristian Høgsberg <krh at bitplanet.net>

---

 src/intel/vulkan/anv_private.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/intel/vulkan/anv_private.h b/src/intel/vulkan/anv_private.h
index 2840f98..63c207a 100644
--- a/src/intel/vulkan/anv_private.h
+++ b/src/intel/vulkan/anv_private.h
@@ -858,6 +858,15 @@ __gen_combine_address(struct anv_batch *batch, void *location,
       VG(VALGRIND_CHECK_MEM_IS_DEFINED(dw, ARRAY_SIZE(dwords0) * 4));\
    } while (0)
 
+#define anv_batch_emit_blk(batch, cmd, name)                            \
+   for (struct cmd name = { __anv_cmd_header(cmd) },                    \
+        *_dst = anv_batch_emit_dwords(batch, __anv_cmd_length(cmd));    \
+        __builtin_expect(_dst != NULL, 1);                              \
+        ({ __anv_cmd_pack(cmd)(batch, _dst, &name);                     \
+           VG(VALGRIND_CHECK_MEM_IS_DEFINED(_dst, __anv_cmd_length(cmd) * 4)); \
+           _dst = NULL;                                                 \
+         }))
+
 #define anv_state_pool_emit(pool, cmd, align, ...) ({                   \
       const uint32_t __size = __anv_cmd_length(cmd) * 4;                \
       struct anv_state __state =                                        \