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[Qemu-devel] possible qemu miscompilation by latest gcc
From: |
John Regehr |
Subject: |
[Qemu-devel] possible qemu miscompilation by latest gcc |
Date: |
Wed, 20 Jan 2010 23:15:07 -0700 |
User-agent: |
Thunderbird 2.0.0.23 (X11/20090817) |
Hi folks-
Just wanted to let you know that perhaps the function
helper_neon_rshl_s8() is being miscompiled by the latest gcc.
I'm using qemu 0.12.2 and gcc rev 156103, which is a pre-version of gcc
4.5. This is on an x86 machine running Ubuntu 9.10.
At -O2 or higher this is the resulting object code:
00002060 <helper_neon_rshl_s8>:
2060: 31 c0 xor %eax,%eax
2062: c3 ret
If this is not the intended result, then either the function has a
latent bug or else the compiler is doing something bad.
Hope this is helpful,
John Regehr
- [Qemu-devel] possible qemu miscompilation by latest gcc,
John Regehr <=