[Mesa-dev] [PATCH] [rfc] r600: set vpm bit for loop start clause

[Dave Airlie]

From: Dave Airlie <airlied at redhat.com>

This fixes some hangs with the arb_shader_image_load_store-atomicity tests
on evergreen/cayman GPUs.

I'm not 100% sure why (VPM hurts my brain), I'm running some piglit
runs to see if it has any bad side effects.
---
 src/gallium/drivers/r600/r600_shader.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/gallium/drivers/r600/r600_shader.c b/src/gallium/drivers/r600/r600_shader.c
index 2229dc8fab3..1341bf2c48c 100644
--- a/src/gallium/drivers/r600/r600_shader.c
+++ b/src/gallium/drivers/r600/r600_shader.c
@@ -10587,7 +10587,7 @@ static int tgsi_bgnloop(struct r600_shader_ctx *ctx)
 	/* LOOP_START_DX10 ignores the LOOP_CONFIG* registers, so it is not
 	 * limited to 4096 iterations, like the other LOOP_* instructions. */
 	r600_bytecode_add_cfinst(ctx->bc, CF_OP_LOOP_START_DX10);
-
+	ctx->bc->cf_last->vpm = 1;
 	fc_pushlevel(ctx, FC_LOOP);
 
 	/* check stack depth */
-- 
2.17.1