Fix -0.0

src/rewriter.fs

@@ -112,6 +112,7 @@ let rec private simplifyExpr env = function
     | FunCall(Op "/", [Int (i1, su); Int (i2, _)]) -> Int (i1 / i2, su)
     | FunCall(Op "%", [Int (i1, su); Int (i2, _)]) -> Int (i1 % i2, su)
 
+    | FunCall(Op "-", [Float (0.0,su)]) -> Float (0.0, su)
     | FunCall(Op "-", [Float (f1,su)]) -> Float (-f1, su)
     | FunCall(Op "-", [Float (i1,su); Float (i2,_)]) -> Float (i1 - i2, su)
     | FunCall(Op "+", [Float (i1,su); Float (i2,_)]) -> Float (i1 + i2, su)

tests/commands.txt

@@ -11,6 +11,7 @@
 --no-renaming --format c-variables -o tests/unit/blocks.expected tests/unit/blocks.frag
 --hlsl --no-renaming --format c-variables -o tests/unit/geometry.hlsl.expected tests/unit/geometry.hlsl
 --no-renaming --format c-array -o tests/unit/operators.expected tests/unit/operators.frag
+--no-renaming --format c-array -o tests/unit/minus-zero.expected tests/unit/minus-zero.frag
 
 # Partial renaming tests
 

tests/unit/minus-zero.expected

@@ -0,0 +1,9 @@
+/* File generated with Shader Minifier 1.1.6
+ * http://www.ctrl-alt-test.fr
+ */
+
+// tests/unit/minus-zero.frag
+"void main()"
+ "{"
+   "float a=0.;"
+ "}",

tests/unit/minus-zero.frag

@@ -0,0 +1,4 @@
+void main()
+{
+    float a = -0.0;
+}