Re: [PATCH][AArch64] Implement workaround for ARM Cortex-A53 erratum 835769

2014-10-10 Thread Andrew Pinski
On Fri, Oct 10, 2014 at 3:53 AM, Kyrill Tkachov wrote: > Hi all, > > > Some early revisions of the Cortex-A53 have an erratum (835769) whereby > it is possible for a 64-bit multiply-accumulate instruction in > AArch64 state to generate an incorrect result. The details are quite > complex and hard

Re: [PATCH][AArch64] Implement workaround for ARM Cortex-A53 erratum 835769

2014-10-10 Thread Richard Earnshaw
On 10/10/14 15:22, Kyrill Tkachov wrote: > > On 10/10/14 15:18, Richard Earnshaw wrote: >> On 10/10/14 11:53, Kyrill Tkachov wrote: >>> Hi all, >>> >>> >>> Some early revisions of the Cortex-A53 have an erratum (835769) whereby >>> it is possible for a 64-bit multiply-accumulate instruction in >>>

Re: [PATCH][AArch64] Implement workaround for ARM Cortex-A53 erratum 835769

2014-10-10 Thread Kyrill Tkachov
On 10/10/14 15:18, Richard Earnshaw wrote: On 10/10/14 11:53, Kyrill Tkachov wrote: Hi all, Some early revisions of the Cortex-A53 have an erratum (835769) whereby it is possible for a 64-bit multiply-accumulate instruction in AArch64 state to generate an incorrect result. The details are qu

Re: [PATCH][AArch64] Implement workaround for ARM Cortex-A53 erratum 835769

2014-10-10 Thread Richard Earnshaw
On 10/10/14 11:53, Kyrill Tkachov wrote: > Hi all, > > > Some early revisions of the Cortex-A53 have an erratum (835769) whereby > it is possible for a 64-bit multiply-accumulate instruction in > AArch64 state to generate an incorrect result. The details are quite > complex and hard to determine

Re: [PATCH][AArch64] Implement workaround for ARM Cortex-A53 erratum 835769

2014-10-10 Thread Marcus Shawcroft
On 10 October 2014 11:53, Kyrill Tkachov wrote: > Hi all, > > > Some early revisions of the Cortex-A53 have an erratum (835769) whereby > it is possible for a 64-bit multiply-accumulate instruction in > AArch64 state to generate an incorrect result. The details are quite > complex and hard to det