Constraint of vector types in Zve32*

[jacquesguan]

Constraint of vector types in Zve32*

[topperc]

This sentence from section 3.4.2 in the spec removes LMUL=1/8 for ELEN=32. "For standard vector extensions with ELEN=32, fractional LMULs of 1/2 and 1/4 must be supported. For standard vector extensions with ELEN=64, fractional LMULs of 1/2, 1/4, and 1/8 must be supported"

The other text around there explains the rest.

The summary is that there are no fractional LMULs with SEW==ELEN. And the fractional types that exist are the ones needed to be able to widen to LMUL==1 SEW==ELEN.

[jacquesguan]

This sentence from section 3.4.2 in the spec removes LMUL=1/8 for ELEN=32. "For standard vector extensions with ELEN=32, fractional LMULs of 1/2 and 1/4 must be supported. For standard vector extensions with ELEN=64, fractional LMULs of 1/2, 1/4, and 1/8 must be supported"

The other text around there explains the rest.

The summary is that there are no fractional LMULs with SEW==ELEN. And the fractional types that exist are the ones needed to be able to widen to LMUL==1 SEW==ELEN.

Thanks to response. So vfloat16mf4_t and vfloat32mf2_t should also be not available for Zve32f, but for Zve64f, are they available too?