linux-kernel - Re: [PATCH] sparc64: use unsigned long long for u64

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Date:	Sat, 27 Dec 2008 01:37:12 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	sam@...nborg.org
Cc:	akpm@...ux-foundation.org, sparclinux@...r.kernel.org,
	mingo@...e.hu, sfr@...b.auug.org.au, linux-kernel@...r.kernel.org,
	kenchen@...gle.com, paulus@...ba.org, tglx@...utronix.de,
	hpa@...or.com, linux-next@...r.kernel.org
Subject: Re: [PATCH] sparc64: use unsigned long long for u64

From: Sam Ravnborg <sam@...nborg.org>
Date: Sat, 27 Dec 2008 10:24:04 +0100

> So it looks like my gcc does not promote:
> ((tagval & 0x0fffffff00000000UL) >> 19UL) to unsigned long long int
> but your gcc does?
> 
> My gcc (build with Dan Kegel's crosstool):
> $ /opt/crosstool/gcc-3.4.5-glibc-2.3.6/sparc64-unknown-linux-gnu/bin/sparc64-unknown-linux-gnu-gcc -v
> Reading specs from /opt/crosstool/gcc-3.4.5-glibc-2.3.6/sparc64-unknown-linux-gnu/lib/gcc/sparc64-unknown-linux-gnu/3.4.5/specs
> Configured with: /home/sam/devel/crosstool-0.43/build/sparc64-unknown-linux-gnu/gcc-3.4.5-glibc-2.3.6/gcc-3.4.5/configure --target=sparc64-unknown-linux-gnu --host=i686-host_pc-linux-gnu --prefix=/opt/crosstool/gcc-3.4.5-glibc-2.3.6/sparc64-unknown-linux-gnu --disable-multilib --with-cpu=ultrasparc3 --enable-cxx-flags=-mcpu=ultrasparc3 --with-headers=/opt/crosstool/gcc-3.4.5-glibc-2.3.6/sparc64-unknown-linux-gnu/sparc64-unknown-linux-gnu/include --with-local-prefix=/opt/crosstool/gcc-3.4.5-glibc-2.3.6/sparc64-unknown-linux-gnu/sparc64-unknown-linux-gnu --disable-nls --enable-threads=posix --enable-symvers=gnu --enable-__cxa_atexit --enable-languages=c --enable-shared --enable-c99 --enable-long-long
> Thread model: posix
> gcc version 3.4.5

I'm using a native gcc-4.1.3 here:

gcc (GCC) 4.1.3 20070929 (prerelease) (Ubuntu 4.1.2-16ubuntu2)

When you cross build 32-bit to 64-bit, a small but non-zero
number of warning checks and optimizations are not performed
and I think that is what you're hitting here.
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