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From 836a19a9cc2b0e7ceee628e48b98da14bc81963f Mon Sep 17 00:00:00 2001
From: Andy Wingo <wingo@pobox.com>
Date: Wed, 25 Sep 2024 17:24:51 +0200
Subject: Fix boxing of non-fixnum negative u64 values
* module/language/cps/specialize-numbers.scm (u64->fixnum/truncate): New
helper.
(specialize-operations): Fix specialized boxing of u64 values to
truncate possibly-negative values, to avoid confusing CSE. Fixes
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=71891.
Origin: upstream, commit e45b70dcded37eb77e71ec30445b12040b6bb1b7
---
module/language/cps/specialize-numbers.scm | 21 ++++++++++++++++++++-
1 file changed, 20 insertions(+), 1 deletion(-)
diff --git a/module/language/cps/specialize-numbers.scm b/module/language/cps/specialize-numbers.scm
index f70c28e08..b46919a40 100644
--- a/module/language/cps/specialize-numbers.scm
+++ b/module/language/cps/specialize-numbers.scm
@@ -115,6 +115,13 @@
(letk ks64 ($kargs ('s64) (s64) ,tag-body))
(build-term
($continue ks64 src ($primcall 'u64->s64 #f (u64))))))
+(define (u64->fixnum/truncate cps k src u64 bits)
+ (with-cps cps
+ (letv truncated)
+ (let$ tag-body (u64->fixnum k src truncated))
+ (letk ku64 ($kargs ('truncated) (truncated) ,tag-body))
+ (build-term
+ ($continue ku64 src ($primcall 'ulogand/immediate bits (u64))))))
(define-simple-primcall scm->u64)
(define-simple-primcall scm->u64/truncate)
(define-simple-primcall u64->scm)
@@ -473,7 +480,19 @@ BITS indicating the significant bits needed for a variable. BITS may be
(define (box-s64 result)
(if (fixnum-result? result) tag-fixnum s64->scm))
(define (box-u64 result)
- (if (fixnum-result? result) u64->fixnum u64->scm))
+ (call-with-values
+ (lambda ()
+ (lookup-post-type types label result 0))
+ (lambda (type min max)
+ (cond
+ ((and (type<=? type &exact-integer)
+ (<= 0 min max (target-most-positive-fixnum)))
+ u64->fixnum)
+ ((only-fixnum-bits-used? result)
+ (lambda (cps k src u64)
+ (u64->fixnum/truncate cps k src u64 (intmap-ref sigbits result))))
+ (else
+ u64->scm)))))
(define (box-f64 result)
f64->scm)
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