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From 804995807dfea9cbdbd676e52b95d42715101913 Mon Sep 17 00:00:00 2001
From: Eric Anholt <eric@anholt.net>
Date: Fri, 08 Jul 2011 22:30:48 +0000
Subject: i965/gen4: Fix GPU hangs since the program streaming change.
This was tricky. We were doing a use-before-initialize of
grf_reg_count, but the value usually got overwritten anyway -- when we
didn't have to do a relocation (typical), or on gen5 when we didn't
have relocations at all.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=38771
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
(cherry picked from commit d03fdc4cdefdfdc5b59547945704c6037a5061c7)
---
diff --git a/src/mesa/drivers/dri/i965/brw_vs_state.c b/src/mesa/drivers/dri/i965/brw_vs_state.c
index d5010a2..179ca19 100644
--- a/src/mesa/drivers/dri/i965/brw_vs_state.c
+++ b/src/mesa/drivers/dri/i965/brw_vs_state.c
@@ -47,6 +47,7 @@ brw_prepare_vs_unit(struct brw_context *brw)
memset(vs, 0, sizeof(*vs));
/* BRW_NEW_PROGRAM_CACHE | CACHE_NEW_VS_PROG */
+ vs->thread0.grf_reg_count = ALIGN(brw->vs.prog_data->total_grf, 16) / 16 - 1;
vs->thread0.kernel_start_pointer =
brw_program_reloc(brw,
brw->vs.state_offset +
@@ -54,7 +55,6 @@ brw_prepare_vs_unit(struct brw_context *brw)
brw->vs.prog_offset +
(vs->thread0.grf_reg_count << 1)) >> 6;
- vs->thread0.grf_reg_count = ALIGN(brw->vs.prog_data->total_grf, 16) / 16 - 1;
vs->thread1.floating_point_mode = BRW_FLOATING_POINT_NON_IEEE_754;
/* Choosing multiple program flow means that we may get 2-vertex threads,
* which will have the channel mask for dwords 4-7 enabled in the thread,
--
cgit v0.8.3-6-g21f6
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