icode: discard unused pure ICode expressions

[nit.git] / src / compiling / compiling_icode.nit

diff --git a/src/compiling/compiling_icode.nit b/src/compiling/compiling_icode.nit
index 847280b..97514ac 100644 (file)
--- a/src/compiling/compiling_icode.nit
+++ b/src/compiling/compiling_icode.nit
@@ -358,7 +358,9 @@ redef class ICode
                if r != null and r.slot_index != null then
                        assert s != null
                        v.add_assignment(v.register(r), s)
-               else if s != null and not self isa IMove then
+               else if s != null and not is_pure then
+                       # ICode with side effects must be evaluated
+                       # even if the result is not wanted
                        v.add_instr(s + ";")
                end
        end