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Re: [Qemu-devel] [PATCH for 2.5] QEMU does not care about left shifts of
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH for 2.5] QEMU does not care about left shifts of signed negative values |
Date: |
Tue, 17 Nov 2015 14:48:49 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 |
On 17/11/2015 13:04, Peter Maydell wrote:
> > Using -fwrapv means that integer signed overflow is fully defined:
> > it wraps. When -fwrapv is used, there is no difference between
> > -fstrict-overflow and -fno-strict-overflow for integers.
>
> I thought this too, but note that it says "for integers". As Laszlo
> says, the reason to provide both is to get the -fno-strict-overflow
> behaviour for pointer arithmetic, which is not affected by -fwrapv.
And ubsan is not affected by -fno-strict-overflow...
Paolo
- Re: [Qemu-devel] [PATCH for 2.5] QEMU does not care about left shifts of signed negative values, (continued)
- Re: [Qemu-devel] [PATCH for 2.5] QEMU does not care about left shifts of signed negative values, Laszlo Ersek, 2015/11/17
- Re: [Qemu-devel] [PATCH for 2.5] QEMU does not care about left shifts of signed negative values, Paolo Bonzini, 2015/11/17
- Re: [Qemu-devel] [PATCH for 2.5] QEMU does not care about left shifts of signed negative values, Laszlo Ersek, 2015/11/17
- Re: [Qemu-devel] [PATCH for 2.5] QEMU does not care about left shifts of signed negative values, Markus Armbruster, 2015/11/17
- Re: [Qemu-devel] [PATCH for 2.5] QEMU does not care about left shifts of signed negative values, Peter Maydell, 2015/11/17
- Re: [Qemu-devel] [PATCH for 2.5] QEMU does not care about left shifts of signed negative values, Laszlo Ersek, 2015/11/17
- Re: [Qemu-devel] [PATCH for 2.5] QEMU does not care about left shifts of signed negative values,
Paolo Bonzini <=
- Re: [Qemu-devel] [PATCH for 2.5] QEMU does not care about left shifts of signed negative values, Laszlo Ersek, 2015/11/17
Re: [Qemu-devel] [PATCH for 2.5] QEMU does not care about left shifts of signed negative values, Markus Armbruster, 2015/11/17