May 2016
Intermediate to advanced
504 pages
12h 11m
English
Content preview from Modern Assembly Language Programming with the ARM Processor
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10.9.8 Count Bits
These instructions can be used to count leading sign bits or zeros, or to count the number of bits that are set for each element in a vector:
vcls Count Leading Sign Bits
vclz Count Leading Zero Bits
vcnt Count Set Bits
Syntax
• <op> is either cls, clz or cnt.
• The valid choices for <type> are given in the following table:
| Opcode | Valid Types |
| vcls | s8, s16, or s32 |
| vclz | u8, u16, or u32 |
| vcnt | i8 |
Operations
| Name | Effect | Description |
| vcls |
for 0 ≤ i < n) do end for | Count the number ... |
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