waitcnt

Counts of outstanding instructions to wait for.

The bits of this operand have the following meaning:

Bits	Description	Value Range
3:0	VM_CNT: vector memory operations count.	0..15
6:4	EXP_CNT: export count.	0..7
12:8	LGKM_CNT: LDS, GDS, Constant and Message count.	0..31

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 combination of vmcnt, expcnt, lgkmcnt and other values described below.

  Syntax	Description
  vmcnt(<N>)	A VM_CNT value. N must not exceed the largest VM_CNT value.
  expcnt(<N>)	An EXP_CNT value. N must not exceed the largest EXP_CNT value.
  lgkmcnt(<N>)	An LGKM_CNT value. N must not exceed the largest LGKM_CNT value.
  vmcnt_sat(<N>)	A VM_CNT value computed as min(N, the largest VM_CNT value).
  expcnt_sat(<N>)	An EXP_CNT value computed as min(N, the largest EXP_CNT value).
  lgkmcnt_sat(<N>)	An LGKM_CNT value computed as min(N, the largest LGKM_CNT value).

These values may be specified in any order. Spaces, ampersands and commas may be used as optional separators.

N is either an :ref:`integer number<amdgpu_synid_integer_number>` or an :ref:`absolute expression<amdgpu_synid_absolute_expression>`.

Examples:

vm_cnt = 1
exp_cnt = 2
lgkm_cnt = 3
cnt = vm_cnt | (exp_cnt << 4) | (lgkm_cnt << 8)

s_waitcnt cnt
s_waitcnt 1 | (2 << 4) | (3 << 8)                          // the same as above
s_waitcnt vmcnt(1) expcnt(2) lgkmcnt(3)                    // the same as above
s_waitcnt vmcnt(vm_cnt) expcnt(exp_cnt) lgkmcnt(lgkm_cnt)  // the same as above

s_waitcnt vmcnt(1)
s_waitcnt expcnt(2) lgkmcnt(3)
s_waitcnt vmcnt(1), expcnt(2), lgkmcnt(3)
s_waitcnt vmcnt(1) & lgkmcnt_sat(100) & expcnt(2)