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From f269f147357bdd59ac3e984563fc92d89b178de9 Mon Sep 17 00:00:00 2001
From: Andy Wingo <wingo@pobox.com>
Date: Wed, 25 Sep 2024 17:27:17 +0200
Subject: Tighten up range inference for scm->u64/truncate
* module/language/cps/types.scm (scm->u64/truncate): Better range
analysis.
Origin: upstream, commit 30c3849092b17a56b9b74dd23da121afc5076e08
---
module/language/cps/types.scm | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/module/language/cps/types.scm b/module/language/cps/types.scm
index 512be4bb2..db4a8c7c8 100644
--- a/module/language/cps/types.scm
+++ b/module/language/cps/types.scm
@@ -1008,10 +1008,12 @@ minimum, and maximum."
(define! result &u64 param param))
(define-type-checker (scm->u64/truncate scm)
- (check-type scm &exact-integer &range-min &range-max))
+ (check-type scm &exact-integer -inf.0 +inf.0))
(define-type-inferrer (scm->u64/truncate scm result)
- (restrict! scm &exact-integer &range-min &range-max)
- (define! result &u64 0 &u64-max))
+ (restrict! scm &exact-integer -inf.0 +inf.0)
+ (if (<= 0 (&min scm) (&max scm) &u64-max)
+ (define! result &u64 (&min scm) (&max scm))
+ (define! result &u64 0 &u64-max)))
(define-type-checker (u64->scm u64)
#t)
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