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VR4102 Datasheet(PDF) 644 Page - NEC |
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VR4102 Datasheet(HTML) 644 Page - NEC |
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644 / 701 page  CHAPTER 27 CPU INSTRUCTION SET DETAILS 644 SUB Subtract SUB rs SPECIAL 0 0 0 0 0 0 rt rd 0 0 0 0 0 0 SUB 1 0 0 0 1 0 31 26 25 21 20 16 15 11 10 6 5 0 6 5555 6 Format: SUB rd, rs, rt Description: The contents of general register rt are subtracted from the contents of general register rs to form a result. The result is placed into general register rd. In 64-bit mode, the operands must be valid sign-extended, 32-bit values. The only difference between this instruction and the SUBU instruction is that SUBU never traps on overflow. An integer overflow exception takes place if the carries out of bits 30 and 31 differ (2’s complement overflow). The destination register rd is not modified when an integer overflow exception occurs. Operation: 32 T: GPR [rd] <- GPR [rs] - GPR [rt] 64 T: temp <- GPR [rs] - GPR [rt] GPR [rd] <- (temp31) 32 || temp31...0 Exceptions: Integer overflow exception |
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