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[Bug-mit-scheme] [bug #27887] i386 assembly hook for generic multiplicat
From: |
Taylor R. Campbell |
Subject: |
[Bug-mit-scheme] [bug #27887] i386 assembly hook for generic multiplication multiplies fixnums incorrectly |
Date: |
Fri, 30 Oct 2009 21:24:56 +0000 |
User-agent: |
Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en-US) AppleWebKit/525.18 (KHTML, like Gecko, Safari/525.20) OmniWeb/v622.6.1.0.111015 |
URL:
<http://savannah.gnu.org/bugs/?27887>
Summary: i386 assembly hook for generic multiplication
multiplies fixnums incorrectly
Project: MIT/GNU Scheme
Submitted by: riastradh
Submitted on: Fri 30 Oct 2009 21:24:55 GMT
Category: microcode
Severity: 2 - Minor
Priority: 5 - Normal
Item Group: Incorrect behavior
Status: None
Privacy: Public
Assigned to: riastradh
Originator Name:
Originator Email:
Open/Closed: Open
Discussion Lock: Any
Keywords:
_______________________________________________________
Details:
((fluid-let ((compiler:open-code-primitives? #f))
(compile-procedure
(eval `(LAMBDA (X Y) (,(make-primitive-procedure '&*) X Y))
(nearest-repl/environment))))
1
2)
;Value: 128
This is a reminder to me to commit the fix (shift EAX right by 6 before
IMUL), once I have cleaned up a large number of other changes that it
shouldn't get swept into.
(This doesn't really matter at all -- nobody ever inhibits open-coding of
primitives, so that the fixnum case is always open-coded and the assembly
hook's fixnum case is never used. So this bug has lain dormant for fifteen
years.)
_______________________________________________________
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