What is Sign extension?
Widening a signed integer to more bits by copying its top (sign) bit into all the new upper bits, which preserves its value. Filling the upper bits with zeros is zero extension.
Field: ISA & Assembly
Sign extension in the explanations
Thanks to sign extension, adding a negative immediate performs subtraction.
On RISC-V RV32I, what 32-bit value is in t0 after "addi t0,…lb (load byte) treats the byte as signed and copies its top bit into the upper 24 bits (sign extension).
A byte in memory holds 0x80. Which pair correctly gives the…
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Related terms
Two's complement Addressing mode Application binary interface (ABI) Assembler Branch delay slot Callee-saved register Caller-saved register Calling convention Compressed instruction Condition code