diff options
Diffstat (limited to 'backend/CSE.v')
| -rw-r--r-- | backend/CSE.v | 19 |
1 files changed, 5 insertions, 14 deletions
diff --git a/backend/CSE.v b/backend/CSE.v index dab8fc3..4347c33 100644 --- a/backend/CSE.v +++ b/backend/CSE.v @@ -375,23 +375,14 @@ Definition analyze (f: RTL.function): PMap.t numbering := (** * Code transformation *) -(** Some operations are so cheap to compute that it is generally not - worth reusing their results. These operations are detected by the - function below. *) - -Definition is_trivial_op (op: operation) : bool := - match op with - | Omove => true - | Ointconst _ => true - | Oaddrsymbol _ _ => true - | Oaddrstack _ => true - | _ => false - end. - (** The code transformation is performed instruction by instruction. [Iload] instructions and non-trivial [Iop] instructions are turned into move instructions if their result is already available in a - register, as indicated by the numbering inferred at that program point. *) + register, as indicated by the numbering inferred at that program point. + + Some operations are so cheap to compute that it is generally not + worth reusing their results. These operations are detected by the + function [is_trivial_op] in module [Op]. *) Definition transf_instr (n: numbering) (instr: instruction) := match instr with |