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i965/fs: Use measured Gen7 instruction timings on Gen6. 

x before
+ after
+------------------------------------------------------------------------------+
|   x                                   x   +                                  |
|   xx  ++                              x   +                                  |
|   xx  ++ +                           xx   ++                                 |
|x xxx x+++++          +           xxx x*x+*+++ +         x                   +|
|   |_____|____________A______A____M____M_|_______|                            |
+------------------------------------------------------------------------------+
    N           Min           Max        Median           Avg        Stddev
    x  23       8083.78       8287.83       8205.55     8162.7461     68.307951
    +  23       8107.56       8358.74       8224.33     8186.1765     71.506301
    No difference proven at 95.0% confidence

Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Matt Turner 2013-03-28 11:38:57 -07:00
parent f085b21b25
commit 0e0ab8a071
1 changed files with 4 additions and 1 deletions
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5
src/mesa/drivers/dri/i965/brw_fs_schedule_instructions.cpp
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@ -67,7 +67,10 @@ public:
this->parent_count = 0;
this->unblocked_time = 0;
if (intel->gen >= 7)
/* We can't measure Gen6 timings directly but expect them to be much
* closer to Gen7 than Gen4.
*/
if (intel->gen >= 6)
set_latency_gen7(intel->is_haswell);
else
set_latency_gen4();