Does B200 / 5090 support tcgen05.ld.red ？

Accelerated Computing CUDA CUDA NVCC Compiler
1

I am trying to understand which GPUs support the tcgen05.ld.red instruction. I found conflicting information in the PTX ISA V9.2 (P681)

In the “Target ISA Notes” section for tcgen05 instructions, there are two architecture lists:

First list (no instruction name specified):

  • sm_100a

  • sm_101a (Renamed to sm_110a from PTX ISA version 9.0)

  • sm_100f or higher in the same family

  • sm_101f or higher in the same family (Renamed to sm_110f from PTX ISA version 9.0)

  • sm_110f or higher in the same family

Second list ( explicitly for tcgen05.ld.red ):

  • sm_101a (Renamed to sm_110a from PTX ISA version 9.0)

  • sm_101f or higher in the same family (Renamed to sm_110f from PTX ISA version 9.0)

  • sm_103f or higher in the same family

  • sm_110f or higher in the same family

My question: Does the first list refer to tcgen05.ld or tcgen05.ld.red ? Thank you for clarifying !

2

Yes it does.

In answer to “Does B200 / 5090 support tcgen05.ld.red ?”, no.

B200 is sm_100 and 5090 is sm_120.

3

Thanks! I check the PTX doc again. The whole section argues tcgen05.ld, so the first list should refers to pure load inst. Sensible :D