Arch86

Opcode	Encoding	16-bit	32-bit	64-bit	`CPUID` Feature Flag(s)	Description
`66 0F AE mem/6` `CLWB m8`	`m`	Valid	Valid	Valid	`clwb`	Write back the cache line containing m8 into main memory. The data may remain in the cache line afterwards.
Opcode: `66 0F AE mem/6` Mnemonic: `CLWB m8` Encoding: `m` Validity (16/32/64 bit): valid, valid, valid `CPUID` Feature Flag(s): `clwb` Write back the cache line containing m8 into main memory. The data may remain in the cache line afterwards.

Encoding

Encoding	Operand
`m`	`ModRM.r/m[w]`

Description

The CLWB instruction writes back the cache line (if modified) containing m8 into main memory. The data may remain in the cache line afterwards, but this is not guaranteed.

Operation

public void CLWB(IntPtr addr)
{
    CacheLineWriteBack(addr)
}

Flags Affected

None.

Intrinsics

void _mm_clwb(void const* p)

Exceptions

Real-Address Mode

#UD

If the
LOCK
prefix is used.

#SS(0)

If a memory operand using the
SS
segment has an effective address that is outside the
SS
segment's limit.

#GP(0)

If a memory operand (using a segment other than
SS
) has an effective address that is outside the segment's limit.

Virtual-8086 Mode

#UD

If the
LOCK
prefix is used.

#SS(0)

If a memory operand using the
SS
segment has an effective address that is outside the
SS
segment's limit.

#GP(0)

If a memory operand (using a segment other than
SS
) has an effective address that is outside the segment's limit.

#PF(fc)

If a page fault occurs.

Protected Mode

#UD

If the
LOCK
prefix is used.

#SS(0)

If a memory operand using the
SS
segment has an effective address that is outside the
SS
segment's limit.

#GP(0)

If the destination is located in a non-writable segment.
If a memory operand uses a segment containing a NULL selector.
If a memory operand (using a segment other than SS) has an effective address that is outside the segment's limit.

#PF(fc)

If a page fault occurs.

Compatibility Mode

#UD

If the
LOCK
prefix is used.

#SS(0)

If a memory operand using the
SS
segment has an effective address that is outside the
SS
segment's limit.

#GP(0)

If the destination is located in a non-writable segment.
If a memory operand uses a segment containing a NULL selector.
If a memory operand (using a segment other than SS) has an effective address that is outside the segment's limit.

#PF(fc)

If a page fault occurs.

Long Mode

#UD

If the
LOCK
prefix is used.

#SS(0)

If a memory operand using the SS segment is in non-canonical form.
If a memory operand using the SS segment has an effective address that is outside the SS segment's limit.

#GP(0)

If a memory operand (using a segment other than SS) is in non-canonical form.
If the destination is located in a non-writable segment.
If a memory operand uses a segment containing a NULL selector.
If a memory operand (using a segment other than SS) has an effective address that is outside the segment's limit.

#PF(fc)

If a page fault occurs.