From: Jeff King <peff@peff.net>
Date: Tue, 29 Dec 2015 06:35:46 +0000 (-0500)
Subject: avoid shifting signed integers 31 bits
X-Git-Tag: v2.7.1~25^2~1
X-Git-Url: https://git.lorimer.id.au/gitweb.git/diff_plain/9a93c6686f56086fe5280a85513041bbfebf41d0?hp=9a93c6686f56086fe5280a85513041bbfebf41d0

avoid shifting signed integers 31 bits

We sometimes use 32-bit unsigned integers as bit-fields.
It's fine to access the MSB, because it's unsigned. However,
doing so as "1 << 31" is wrong, because the constant "1" is
a signed int, and we shift into the sign bit, causing
undefined behavior.

We can fix this by using "1U" as the constant.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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