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From: Paul F. <pj...@wa...> - 2021-11-24 19:26:28
|
On 24/11/2021 00:11, Bart Van Assche wrote: > > Hi Paul, > > Has it been considered to change the compiler flags instead of the > test case source > code? > Hi Bart I was just doing some testing with GCC git head (future GCC 12). For these two I was trying to see a bit what the compiler was doing, and since I already fixed the error (without causing any older compilers to fail) I pushed the changes. Looking forward, there looks like a lot of changes will be required to keep the regression tests clean - I got over 130 failures in total. Removing optimization will certainly be one option, and generally I prefer that over changes that require expected to be updated. I don't have any plans to resolve these failures en masse, though I may chip away at a few as I work on other things. A+ Paul |
|
From: Ambalu, R.
|
Understood, thanik you for the thorough explanation. I'll pass along to the pyarrow maintainers -----Original Message----- From: John Reiser <jr...@bi...> Sent: Tuesday, November 23, 2021 6:09 PM To: val...@li... Subject: Re: [Valgrind-developers] Unrecognised instruction request On 11/23/21 08:46, Ambalu, Robert wrote: > 0x62 0xF1 0xFD 0x8 0x6F 0x44 0x24 0xA 0xC7 0x43 This is vmovdqa64 0xa0(%rsp),%xmm0 which requires CPU feature flag AVX512VL/AVX512F which is not supported by valgrind 3.18.1. In the results of the emulated CPUID instruction, valgrind tells the running application that AVX512 is not supported. It is a bug in pyarrow ( python ) that its initialization routine does not check the cpu feature flags, and switch its later run-time instructions appropriately. Please report this bug to the maintainers of pyarrow. Modern run-time libraries use the STT_GNU_IFUNC feature to choose at run time which instruction set is available and may be used. pyarrow (and/or python3 itself) must upgrade. Gcc supports compile-time feature flags to avoid generating code that uses certain instructions. Run "info gcc" and search for "avx512", paying attention to the flags beginning with "-mavx512", and in particular the "-mno-avx512" variants. Some software administration systems for installing and maintaining software packages can limit the hardware features that packages may assume. You may be able to work-around valgrind's non-support for AVX512 by telling the packaging system to avoid the package variants which require AVX512. _______________________________________________ Valgrind-developers mailing list Val...@li... https://urldefense.com/v3/__https://lists.sourceforge.net/lists/listinfo/valgrind-developers__;!!K_TC0FI_KA!4V2IlnDw8tJ7DJLRT5jea4uUWHWCfZRWe2_efWl48nET9r5gND9JGkZHVEKQHVGzdBACBg$ DISCLAIMER: This e-mail message and any attachments are intended solely for the use of the individual or entity to which it is addressed and may contain information that is confidential or legally privileged. If you are not the intended recipient, you are hereby notified that any dissemination, distribution, copying or other use of this message or its attachments is strictly prohibited. If you have received this message in error, please notify the sender immediately and permanently delete this message and any attachments. |