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In a disassembled program I’m analyzing, I found the command
sar %eax
What does this do? I know that sar with two arguments performs a right shift, but I can’t find what it means with only one parameter.
This program was compiled for an Intel x86 processor.
Looks like the dissembler used short-hand for
SAR EAX,1which has an opcode of0xD1F8. when the immediate is not 1, akaSAR EAX,xx, the opcode is0xC1F8 xx, see the Intel Instruction reference, Vol. 2B, 4-353.