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.. _amdgpu_synid_sendmsg:
sendmsg
=======
An 8-bit value in simm16[7:0] encodes the message type.
This operand may be specified as one of the following:
* An :ref:`integer_number<amdgpu_synid_integer_number>` or an :ref:`absolute_expression<amdgpu_synid_absolute_expression>`. The value must be in the range 0..0xFFFF.
* A *sendmsg* value described below.
==================================== ====================================================
Sendmsg Value Syntax Description
==================================== ====================================================
sendmsg(<*type*>) A message identified by its *type*.
==================================== ====================================================
*Type* may be specified using message *name* or message *id*.
Numeric values may be specified as positive :ref:`integer numbers<amdgpu_synid_integer_number>`
or :ref:`absolute expressions<amdgpu_synid_absolute_expression>`.
Only the following message types are valid.
====================== ===========
Message type simm16[7:0]
====================== ===========
Reserved 0
MSG_INTERRUPT 1
MSG_HS_TESSFACTOR 2
MSG_DEALLOC_VGPRS 3
MSG_GS_ALLOC_REQ 9
====================== ===========
Examples:
.. parsed-literal::
// numeric message code
msg = 0x1
s_sendmsg 0x3
s_sendmsg msg + 2
// sendmsg with strict arguments validation
s_sendmsg sendmsg(MSG_INTERRUPT)
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