diff options
Diffstat (limited to 'bytecomp/simplif.ml')
| -rw-r--r-- | bytecomp/simplif.ml | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/bytecomp/simplif.ml b/bytecomp/simplif.ml index e26524e67..d5f85fc3a 100644 --- a/bytecomp/simplif.ml +++ b/bytecomp/simplif.ml @@ -260,6 +260,9 @@ let simplify_exits lam = let simplify_lets lam = + (* Disable optimisations for bytecode compilation with -g flag *) + let optimize = !Clflags.native_code || not !Clflags.debug in + (* First pass: count the occurrences of all let-bound identifiers *) let occ = (Hashtbl.create 83: (Ident.t, int ref) Hashtbl.t) in @@ -307,7 +310,7 @@ let simplify_lets lam = count bv l1; List.iter (count bv) ll | Lfunction(kind, params, l) -> count Tbl.empty l - | Llet(str, v, Lvar w, l2) when not !Clflags.debug -> + | Llet(str, v, Lvar w, l2) when optimize -> (* v will be replaced by w in l2, so each occurrence of v in l2 increases w's refcount *) count (bind_var bv v) l2; @@ -361,7 +364,6 @@ let simplify_lets lam = and substitute the bindings of variables used exactly once. *) let subst = Hashtbl.create 83 in - let optimize = !Clflags.native_code || not !Clflags.debug in (* This (small) optimisation is always legal, it may uncover some tail call later on. *) |