Intel Pentium Instruction Set Reference
MOVSX - Move with Sign-Extension
| Code |
Mnemonic |
Description |
| 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
| ID |
unaffected |
DF |
unaffected |
| VIP |
unaffected |
IF |
unaffected |
| VIF |
unaffected |
TF |
unaffected |
| AC |
unaffected |
SF |
unaffected |
| VM |
unaffected |
ZF |
unaffected |
| RF |
unaffected |
AF |
unaffected |
| NT |
unaffected |
PF |
unaffected |
| IOPL |
unaffected |
CF |
unaffected |
| OF |
unaffected |