i965/fs: Don't set dependency hints on instructions with spilled destinations
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
diff --git a/src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp b/src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp
index 2313af9..44c74a3 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp
@@ -881,6 +881,14 @@
inst->dst.reg = spill_src.reg;
inst->dst.reg_offset = 0;
+ /* If we're immediately spilling the register, we should not use
+ * destination dependency hints. Doing so will cause the GPU do
+ * try to read and write the register at the same time and may
+ * hang the GPU.
+ */
+ inst->no_dd_clear = false;
+ inst->no_dd_check = false;
+
/* If our write is going to affect just part of the
* inst->regs_written(), then we need to unspill the destination
* since we write back out all of the regs_written().