commit 983460e6cd51b4b51bd1363b75324f99e7161c7b
author Olli Etuaho <oetuaho@nvidia.com> Wed May 02 17:57:39 2018 +0300
committer Commit Bot <commit-bot@chromium.org> Fri May 04 08:40:32 2018 +0000
tree 41982e320b08ad10762deb13dfa06ba8b0af37e2
parent 7a8fe15682f39a0e26c860c2973ec02f53120a24

Rewrite repeated assignments to swizzled vectors on NVIDIA

This works around the most common instances of a bug that reproduces
on some NVIDIA OpenGL drivers prior to version 397.31.

BUG=chromium:798117
TEST=angle_end2end_tests

Change-Id: Iafc6a9a64e56fa98b42117149fe6867040e932e5
Reviewed-on: https://chromium-review.googlesource.com/1042190
Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>

src/compiler/translator/Compiler.cpp

diff --git a/src/compiler/translator/Compiler.cpp b/src/compiler/translator/Compiler.cpp
index 0025b5c..74eb7bb 100644
--- a/src/compiler/translator/Compiler.cpp
+++ b/src/compiler/translator/Compiler.cpp
@@ -38,6 +38,7 @@
 #include "compiler/translator/tree_ops/RemovePow.h"
 #include "compiler/translator/tree_ops/RemoveUnreferencedVariables.h"
 #include "compiler/translator/tree_ops/RewriteDoWhile.h"
+#include "compiler/translator/tree_ops/RewriteRepeatedAssignToSwizzled.h"
 #include "compiler/translator/tree_ops/ScalarizeVecAndMatConstructorArgs.h"
 #include "compiler/translator/tree_ops/SeparateDeclarations.h"
 #include "compiler/translator/tree_ops/SimplifyLoopConditions.h"
@@ -737,6 +738,11 @@
         ClampFragDepth(root, &getSymbolTable());
     }
 
+    if (compileOptions & SH_REWRITE_REPEATED_ASSIGN_TO_SWIZZLED)
+    {
+        sh::RewriteRepeatedAssignToSwizzled(root);
+    }
+
     if (compileOptions & SH_REWRITE_VECTOR_SCALAR_ARITHMETIC)
     {
         VectorizeVectorScalarArithmetic(root, &getSymbolTable());