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Clarify how the largest element index is determined #876

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Clarify how the largest element index is determined #876

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5 changes: 3 additions & 2 deletions v-spec.adoc
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Expand Up @@ -558,8 +558,9 @@ setting (8) and the smallest SEW setting (8), so VLMAX_max = 8*VLEN/8
= VLEN. For example, for VLEN=256, `vstart` would have 8 bits to
represent indices from 0 through 255.

The use of `vstart` values greater than the largest element index for
the current `vtype` setting is reserved.
The use of `vstart` values greater than the largest element index is reserved.
The largest element index is determined using the EEW and EMUL of any vector
operand of the current instruction.

NOTE: It is recommended that implementations trap if `vstart` is out
of bounds. It is not required to trap, as a possible future use of
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