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ST20-C1 Datenblatt(PDF) 11 Page - STMicroelectronics |
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ST20-C1 Datenblatt(HTML) 11 Page - STMicroelectronics |
11 / 205 page 11/205 2 Notation ® represent an address which is offset by x words (4x bytes) from the address in register. For example, in the specification of load non-local there is: Areg ′← word[Areg @ n] Here, Areg is loaded with the contents of the word that is n words from the address pointed to by Areg, i.e. the word at address Areg + 4n. In all cases, if the given base address has the correct alignment then any offset used will also give a correctly aligned address. 2.3 Operators used in the definitions A full list of the operators used in the instruction definitions is given in Table 2.1. Unless otherwise stated, all arithmetic is signed. Modulo operators Arithmetic is done using modulo arithmetic — i.e. there is no checking for errors and, if the calculation overflows, the result ‘wraps around’ the range of values representable in the word length of the processor — e.g. adding 1 to the address at the top of the Symbol Meaning Unchecked (modulo) integer arithmetic + − × / rem Signed integer add, subtract, multiply, divide and remainder. If the computation overflows the result of the operation is truncated to the word length. If a divide or remainder by zero occurs the result of the operation is undefined. No errors are signalled. The operator ‘ −’ is also used as a monadic operator. Signed comparison operators < > ≤ ≥ = ≠ Comparisons of signed integer values: ‘less than’, ‘greater than’, ‘less than or equal’, ‘greater than or equal’, ‘equal’ and ‘not equal’. Bitwise operators ∼ ∧ ∨ ⊗ >> << >>arith ‘Not’, ‘and’, ‘or’, ‘exclusive or’, logical left and right shift and arithmetic right shift operations on bits in words. Boolean operators not and or Boolean combination in conditionals. Table 2.1 Operators used in the instruction descriptions |
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