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authorMatt Turner <[email protected]>2014-09-27 10:34:07 -0700
committerMatt Turner <[email protected]>2014-09-30 17:09:34 -0700
commit189ac077644c4ef2c6c15080b6d094410c74abdc (patch)
tree0d66fb36ec6fae28f93b164851009cf1220daebd /src/mesa/drivers
parentd13bcdb3a9f9b43010fe8cbb4efbfe7eec0b705b (diff)
i965/vec4: Call opt_algebraic after opt_cse.
The next patch adds an algebraic optimization for the pattern sqrt a, b rcp c, a and turns it into sqrt a, b rsq c, b but many vertex shaders do a = sqrt(b); var1 /= a; var2 /= a; which generates sqrt a, b rcp c, a rcp d, a If we apply the algebraic optimization before CSE, we'll end up with sqrt a, b rsq c, b rcp d, a Applying CSE combines the RCP instructions, preventing this from happening. No shader-db changes. Reviewed-by: Anuj Phogat <[email protected]> Reviewed-by: Ian Romanick <[email protected]>
Diffstat (limited to 'src/mesa/drivers')
-rw-r--r--src/mesa/drivers/dri/i965/brw_vec4.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_vec4.cpp b/src/mesa/drivers/dri/i965/brw_vec4.cpp
index 022ed37a8ef..e0a3d5fa786 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4.cpp
@@ -1790,8 +1790,8 @@ vec4_visitor::run()
OPT(dead_code_eliminate);
OPT(dead_control_flow_eliminate, this);
OPT(opt_copy_propagation);
- OPT(opt_algebraic);
OPT(opt_cse);
+ OPT(opt_algebraic);
OPT(opt_register_coalesce);
} while (progress);