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List: gmp-bugs
Subject: Erro in libgmp when making fdk-aac
From: michael () fuckner ! net (Michael Fuckner)
Date: 2016-07-19 17:44:43
Message-ID: 529f0c1b-9bfc-5e9f-cab1-c945bcb45a8f () fuckner ! net
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Hi,
I just checked microcode Version: 0x8a is used for CPUID 0x506e3-
Intel's Linux Processor Microcode Data File 20160607 contains the same
version.
How to check which CPUs or instructions are affected?
Regards,
Michael!
On 7/19/2016 1:40 PM, Torbj?rn Granlund wrote:
> Michael Fuckner <michael at fuckner.net> writes:
>
> I am using Fedora24 (umgraded from 23) on Intel G3900 (Skylake) and
> try to compile fdk-aac. Any help appreciated!
>
> [snip]
>
> libAACdec/src/aacdec_drc.cpp:137:3: internal compiler error: Illegal
> instruction
> pParams->cut = FL2FXCONST_DBL(0.0f);
> ^~~~~~~
>
> [snip]
>
> in dmesg I see (that's why I believe this problem is related to gmp):
> [87398.237931] traps: expr[13570] trap invalid opcode ip:7f542d3efa1b
> sp:7ffc3d9c3fe8 error:0 in libgmp.so.10.3.0[7f542d3b5000+92000]
>
> I think this is really a problem with the chip, that CPUID claims
> support for instructions which are actually clobbered with silicon
> fuses.
>
> A BIOS upgrade might fix this, as BIOS can patch instructions like
> CPUID. Also, upgrading to GMP 6.1.1 should help, as we there blacklist
> known faulty Intel chips.
>
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