Mesa (master): i965: Initialize compaction tables once per process.

[Matt Turner]

Module: Mesa
Branch: master
Commit: 82811ff17628d978c69dd0c08d4c68069cd482c2
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=82811ff17628d978c69dd0c08d4c68069cd482c2

Author: Matt Turner <mattst88 at gmail.com>
Date:   Fri Nov 21 18:04:51 2014 -0800

i965: Initialize compaction tables once per process.

Reviewed-by: Jason Ekstrand <jason.ekstrand at intel.com>

---

 src/mesa/drivers/dri/i965/brw_eu_compact.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/brw_eu_compact.c b/src/mesa/drivers/dri/i965/brw_eu_compact.c
index 7117890..8e33bcb 100644
--- a/src/mesa/drivers/dri/i965/brw_eu_compact.c
+++ b/src/mesa/drivers/dri/i965/brw_eu_compact.c
@@ -75,6 +75,7 @@
 #include "brw_context.h"
 #include "brw_eu.h"
 #include "intel_asm_annotation.h"
+#include "util/u_atomic.h" /* for p_atomic_cmpxchg */
 
 static const uint32_t g45_control_index_table[32] = {
    0b00000000000000000,
@@ -1247,6 +1248,10 @@ update_gen4_jump_count(struct brw_context *brw, brw_inst *insn,
 void
 brw_init_compaction_tables(struct brw_context *brw)
 {
+   static bool initialized;
+   if (initialized || p_atomic_cmpxchg(&initialized, false, true) != false)
+      return;
+
    assert(g45_control_index_table[ARRAY_SIZE(g45_control_index_table) - 1] != 0);
    assert(g45_datatype_table[ARRAY_SIZE(g45_datatype_table) - 1] != 0);
    assert(g45_subreg_table[ARRAY_SIZE(g45_subreg_table) - 1] != 0);