Message 286391 - Python tracker

Message286391

Author	gco
Recipients	benjamin.peterson, christian.heimes, doko, gco, ned.deily, serhiy.storchaka, skrah, vstinner, ztane
Date	2017-01-28.00:19:44
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1485562785.22.0.746842785973.issue28055@psf.upfronthosting.co.za>
In-reply-to

Content
32-bit and 64-bit SPARC ABIs have 64-bit integer data types. SPARC, like many RISC architectures, also has natural alignment requirements. Attempting to dereference a pointer to a 4-byte-sized object requires 4-byte alignment, for example. 2-byte-sized objects require 2-byte alignment. 8-byte-sized objects require 8-byte alignment. siphash24 is encountering this bug on modern SPARC (32-bit ABI currently, haven't tried compiling as 64-bit yet). The code simply is not portable. Benjamin's patch gets the failing self-test (test_plistlib) to pass as well as the simple test case in msg275493 above.

Content

32-bit and 64-bit SPARC ABIs have 64-bit integer data types.

SPARC, like many RISC architectures, also has natural alignment requirements.  Attempting to dereference a pointer to a 4-byte-sized object requires 4-byte alignment, for example.  2-byte-sized objects require 2-byte alignment.  8-byte-sized objects require 8-byte alignment.

siphash24 is encountering this bug on modern SPARC (32-bit ABI currently, haven't tried compiling as 64-bit yet).  The code simply is not portable.

Benjamin's patch gets the failing self-test (test_plistlib) to pass as well as the simple test case in msg275493 above.

History
Date	User	Action	Args
2017-01-28 00:19:45	gco	set	recipients: + gco, doko, vstinner, christian.heimes, benjamin.peterson, ned.deily, skrah, serhiy.storchaka, ztane
2017-01-28 00:19:45	gco	set	messageid: <1485562785.22.0.746842785973.issue28055@psf.upfronthosting.co.za>
2017-01-28 00:19:45	gco	link	issue28055 messages
2017-01-28 00:19:44	gco	create