Difference between revisions of "X86 microop ISA"
(→Register Ops) |
(→Register Ops) |
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=== Flags === | === Flags === | ||
| − | This microop does not | + | This microop does not set any flags. |
== Mul1u == | == Mul1u == | ||
| Line 147: | Line 147: | ||
=== Flags === | === Flags === | ||
| − | This microop does not | + | This microop does not set any flags. |
== Mulel == | == Mulel == | ||
| + | === mulel: Dest = ProdLo === | ||
| + | Moves the value of the internal ProdLo register into the Dest register. | ||
| + | |||
| + | === Flags === | ||
| + | This microop does not set any flags. | ||
== Muleh == | == Muleh == | ||
| + | |||
| + | === muleh: Dest = ProdHi === | ||
| + | Moves the value of the internal ProdHi register into the Dest register. | ||
| + | |||
| + | === Flags === | ||
| + | This microop optionally sets the CF, ECF, and OF flags. | ||
| + | |||
| + | <table> | ||
| + | <tr> | ||
| + | <td> <b>CF and ECF</b> </td><td> Whether ProdHi is non-zero</td> | ||
| + | </tr> | ||
| + | <tr> | ||
| + | <td> <b>OF</b> </td><td> Whether ProdHi is non-zero. </td> | ||
| + | </tr> | ||
| + | </table> | ||
== Div1 == | == Div1 == | ||
Revision as of 20:23, 27 September 2007
Contents
- 1 Register Ops
- 2 Load/Store Ops
- 3 Load immediate Op
Register Ops
Add
add: Dest = Src1 + Src2
Adds the contents of the Src1 and Src2 registers and puts the result in the Dest register.
addi: Dest = Src1 + Imm
Adds the contents of the Src1 register and the immediate Imm and puts the result in the Dest register.
Flags
This microop optionally sets the CF, ECF, ZF, EZF, PF, AF, SF, and OF flags.
| CF and ECF | The carry out of the most significant bit. |
| ZF and EZF | Whether the result was zero. |
| PF | The parity of the result. |
| AF | The carry from the 4th to 5th bit positions. |
| SF | The sign of the result. |
| OF | Whether there was an overflow. |
Adc
adc: Dest = Src1 + Src2 + CF
Adds the contents of the Src1 and Src2 registers and the carry flag and puts the result in the Dest register.
adci: Dest = Src1 + Imm + CF
Adds the contents of the Src1 register, the immediate Imm, and the carry flag and puts the result in the Dest register.
Flags
This microop optionally sets the CF, ECF, ZF, EZF, PF, AF, SF, and OF flags.
| CF and ECF | The carry out of the most significant bit. |
| ZF and EZF | Whether the result was zero. |
| PF | The parity of the result. |
| AF | The carry from the 4th to 5th bit positions. |
| SF | The sign of the result. |
| OF | Whether there was an overflow. |
Sub
sub: Dest = Src1 - Src2
Subtracts the contents of the Src2 register from the Src1 register and puts the result in the Dest register.
subi: Dest = Src1 - Imm
Subtracts the contents of the immediate Imm from the Src1 register and puts the result in the Dest register.
Flags
This microop optionally sets the CF, ECF, ZF, EZF, PF, AF, SF, and OF flags.
| CF and ECF | The barrow into of the most significant bit. |
| ZF and EZF | Whether the result was zero. |
| PF | The parity of the result. |
| AF | The barrow from the 5th to 4th bit positions. |
| SF | The sign of the result. |
| OF | Whether there was an overflow. |
Sbb
sbb: Dest = Src1 - Src2 - CF
Subtracts the contents of the Src2 register and the carry flag from the Src1 register and puts the result in the Dest register.
sbbi: Dest = Src1 - Imm - CF
Subtracts the immediate Imm and the carry flag from the Src1 register and puts the result in the Dest register.
Flags
This microop optionally sets the CF, ECF, ZF, EZF, PF, AF, SF, and OF flags.
| CF and ECF | The barrow into of the most significant bit. |
| ZF and EZF | Whether the result was zero. |
| PF | The parity of the result. |
| AF | The barrow from the 5th to 4th bit positions. |
| SF | The sign of the result. |
| OF | Whether there was an overflow. |
Mul1s
mul1s: ProdHi:ProdLo = Src1 * Src2
Multiplies the unsigned contents of the Src1 and Src2 registers and puts the high and low portions of the product into the internal registers ProdHi and ProdLo, respectively.
mul1si: ProdHi:ProdLo = Src1 * Imm
Multiplies the unsigned contents of the Src1 register and the immediate Imm and puts the high and low portions of the product into the internal registers ProdHi and ProdLo, respectively.
Flags
This microop does not set any flags.
Mul1u
mul1u: ProdHi:ProdLo = Src1 * Src2
Multiplies the unsigned contents of the Src1 and Src2 registers and puts the high and low portions of the product into the internal registers ProdHi and ProdLo, respectively.
mul1ui: ProdHi:ProdLo = Src1 * Imm
Multiplies the unsigned contents of the Src1 register and the immediate Imm and puts the high and low portions of the product into the internal registers ProdHi and ProdLo, respectively.
Flags
This microop does not set any flags.
Mulel
mulel: Dest = ProdLo
Moves the value of the internal ProdLo register into the Dest register.
Flags
This microop does not set any flags.
Muleh
muleh: Dest = ProdHi
Moves the value of the internal ProdHi register into the Dest register.
Flags
This microop optionally sets the CF, ECF, and OF flags.
| CF and ECF | Whether ProdHi is non-zero |
| OF | Whether ProdHi is non-zero. |
