From Message Descriptor section in gfxspecs:
"Memory fence messages without Commit Enable set do not return
anything to the thread (response length is 0 and destination
register is null)."
It fixes a piglit GPU hang in simulation environment.
Piglit test: arb_shader_image_load_store-shader-mem-barrier
Signed-off-by: Anuj Phogat <anuj.pho...@gmail.com>
Cc: mesa-sta...@lists.freedesktop.org
---
src/intel/compiler/brw_eu_emit.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/src/intel/compiler/brw_eu_emit.c b/src/intel/compiler/brw_eu_emit.c
index 1fb9aab51c..c66b813af8 100644
--- a/src/intel/compiler/brw_eu_emit.c
+++ b/src/intel/compiler/brw_eu_emit.c
@@ -3290,7 +3290,13 @@ brw_memory_fence(struct brw_codegen *p,
*/
insn = next_insn(p, BRW_OPCODE_SEND);
dst = retype(dst, BRW_REGISTER_TYPE_UW);
- brw_set_dest(p, insn, dst);
+
+ /* From Message Descriptor section in gfxspecs:
+ "Memory fence messages without Commit Enable set do not return
+ anything to the thread (response length is 0 and destination
+ register is null).
+ */
+ brw_set_dest(p, insn, retype(vec1(brw_null_reg()), BRW_REGISTER_TYPE_UW));
brw_set_src0(p, insn, dst);
brw_set_memory_fence_message(p, insn, GEN7_SFID_DATAPORT_DATA_CACHE,
commit_enable);
--
2.13.6
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