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| author | Vincent Laviron <vincent.laviron@gmail.com> | 2021-10-05 11:01:54 +0200 |
|---|---|---|
| committer | Vincent Laviron <vincent.laviron@gmail.com> | 2021-10-21 09:01:04 +0200 |
| commit | ff41359014aa0c2965c151c699bd888ea1478b87 (patch) | |
| tree | dafc5a8a5adc08194c2be168ccd099fb28991866 | |
| parent | 37298b0b9f3ee6a48b6eaae2f981e12cc4f9a665 (diff) | |
| download | ocaml-ff41359014aa0c2965c151c699bd888ea1478b87.tar.gz | |
Enable if-then-else elimination in Cmmgen
| -rw-r--r-- | asmcomp/cmmgen.ml | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/asmcomp/cmmgen.ml b/asmcomp/cmmgen.ml index 3876da2e60..ac4f47771c 100644 --- a/asmcomp/cmmgen.ml +++ b/asmcomp/cmmgen.ml @@ -609,8 +609,16 @@ let rec transl env e = let ifso_dbg = Debuginfo.none in let ifnot_dbg = Debuginfo.none in let dbg = Debuginfo.none in - transl_if env Unknown dbg cond - ifso_dbg (transl env ifso) ifnot_dbg (transl env ifnot) + let ifso = transl env ifso in + let ifnot = transl env ifnot in + let approx = + match ifso, ifnot with + | Cconst_int (1, _), Cconst_int (3, _) -> Then_false_else_true + | Cconst_int (3, _), Cconst_int (1, _) -> Then_true_else_false + | _, _ -> Unknown + in + transl_if env approx dbg cond + ifso_dbg ifso ifnot_dbg ifnot | Usequence(exp1, exp2) -> Csequence(remove_unit(transl env exp1), transl env exp2) | Uwhile(cond, body) -> |