[PATCH] D137547: [AArch64][SVE] Use PTRUE instruction for get_active_lane_mask intrinsic if the range is from 0 to SVE predicator constant

[Paul Walker via Phabricator via llvm-commits]

paulwalker-arm added a comment.

This transformation is more subtle than you expect. See https://developer.arm.com/documentation/ddi0602/2022-09/SVE-Instructions/PTRUE--predicate---Initialise-predicate-from-named-constraint-, specifically the part that reads `If the constraint specifies more elements than are available at the current vector length then all elements of the destination predicate are set to false.`.


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