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ST20-C1 Scheda tecnica(PDF) 185 Page - STMicroelectronics |
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ST20-C1 Scheda tecnica(HTML) 185 Page - STMicroelectronics |
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185 / 205 page  185/205 ® 1C; B; A 2 C;A;B;rev 3 B; C; rev; A 4 A; C; rev; B; rev The choice of loading sequence, and of which operands should be evaluated in advance is determined by the number of registers required to evaluate each of the operands. In particular, if C requires more than two registers it must be loaded before A and B.If A or B requires more than two registers it must be evaluated before C and may need to be stored in a temporary variable if C requires more than two registers. Table 8.1 gives the instruction sequences needed for loading three operands into the evaluation stack, where the number in the ‘load sequence’ column refers to the list above. The columns labelled ‘temp’ indicate where a local variable is needed to temporarily save an operand value in the load sequence. The variable ‘a’ is used to store operand ‘A’ and the variable ‘b’ is used to store operand ‘B’. registers required temp load sequence instructions CB A b a ≤ 2 1 1 1 C; B; A 1 2 2 C; A; B; rev 1 >2 4 A; C; rev; B; rev 21 1 C; B; A 2 2 * 1 A; stl a; C; B; ldl a 2 >2 * 1 A; stl a; C; B; ldl a >2 1 3 B; C; rev; A >2 2 * 3 A; stl a; B; C; rev; ldl a >2 >2 * 3 A; stl a; B; C; rev; ldl a >2 1 1 1 C; B; A 1 2 2 C; A; B; rev 1 >2 * 1 A; stl a; C; B; ldl a 21 1 C; B; A 2 2 * 1 A; stl a; C; B; ldl a 2 >2 * 1 A; stl a; C; B; ldl a >2 1 * 1 B; stl b; C; ldl b; A >2 2 * 2 B; stl b; C; A; ldl b; rev >2 >2 * * 1 A; stl a; B; stl b; C; ldl b; ldl a Table 8.1 Register loading sequences |
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