0F BE / r                 MOVSX r16,r/m8         Move byte to word with sign-extension

0F BE / r                 MOVSX r32,r/m8         Move byte to doubleword, sign-extension

0F BF / r                 MOVSX r32,r/m16         Move word to doubleword, sign-extension


Description

Copies the contents of the source operand (register or memory location) to the destination operand (register) and sign extends the value to 16 or 32 bits (see Figure 6-5 in the Intel Architecture Software Developer's Manual, Volume 1). The size of the converted value depends on the operand-size attribute.


Operands        Bytes                Clocks

reg, reg           3                3   NP

reg, mem           3+d(0,1,2,4)        3   NP

(Note: destination reg is 16 or 32-bits; source is 8 or 16 bits)


Flags

None.

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