What is the meaning of the following mnemonics (and what do they do)?
a. LDRSH
b RSBLES
c CMPS
d MRS r0,CPSR
a. LDRSH Load signed half word into register; that is, a 16?bit value is sign?extended to 32 bits before being
loaded into a 32?bit register.
b. RSBLES This looks confusing. It has three components RSB LE S and means if the current condition
code is ‘less than or equal to’ perform a reverse subtract operation and then update the CCR
flags, otherwise do nothing and advance to the next instruction.
c. CMPS This means perform a comparison and then set the CCR. However, since the CMP performs a
comparison by definition, the S is redundant and CMP and CMPS are the same.
d. MRS The MRS instruction copies the status word to a register. MRS r0,CPSR copies the machine
status into register r0.
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