Merge branch 'HaydnTrigg-patch-1'

Test/baseResults/constFold.frag.out

@@ -179,6 +179,10 @@ ERROR: node is still EOpNull!
 0:83        2147483647 (const int)
 0:84      Constant:
 0:84        +1.#INF
+0:84      Constant:
+0:84        -1.#INF
+0:84      Constant:
+0:84        1.#IND
 0:88      Constant:
 0:88        2 (const uint)
 0:88        3 (const uint)

Test/constFold.frag

@@ -81,7 +81,7 @@ void foo()
     a[0] = s.m[1].z;     // 7.0
     b % 0;  // int
     b / 0;
-    e / 0;
+    e / 0;  -e / 0;  0.0 / 0.0;
     const uint ua = 5;
     const uvec2 ub = uvec2(6, 7);
     const uint uc = 8;

glslang/Include/revision.h

 // This header is generated by the make-revision script.
 
-#define GLSLANG_PATCH_LEVEL 2787
+#define GLSLANG_PATCH_LEVEL 2793

glslang/MachineIndependent/Constant.cpp

@@ -179,7 +179,14 @@ TIntermTyped* TIntermConstantUnion::fold(TOperator op, const TIntermTyped* right
             case EbtDouble:
             case EbtFloat:
             case EbtFloat16:
-                newConstArray[i].setDConst(leftUnionArray[i].getDConst() / rightUnionArray[i].getDConst());
+                if (rightUnionArray[i].getDConst() != 0.0)
+                    newConstArray[i].setDConst(leftUnionArray[i].getDConst() / rightUnionArray[i].getDConst());
+                else if (leftUnionArray[i].getDConst() > 0.0)
+                    newConstArray[i].setDConst((double)INFINITY);
+                else if (leftUnionArray[i].getDConst() < 0.0)
+                    newConstArray[i].setDConst((double)-INFINITY);
+                else
+                    newConstArray[i].setDConst((double)NAN);
                 break;
             case EbtInt8:
                 if (rightUnionArray[i] == (signed char)0)