s_waitcnt_vmcnt GPU Native ISA AMD Scalar
S WAITCNT VMCNT Scalar Arithmetic
s_waitcnt_vmcnt
Wait for the VMCNT counter to be at or below the specified level.
Encoding
Verified bit-level encoding data is not yet available for this instruction.
The instruction-format classification below (SOPK)
is well-documented and stable; exact per-target opcode/field bit positions have not
yet been imported from a verified source.
Operands
Operand details have not yet been curated for this instruction.
GFX Target Compatibility
| Target | Support |
|---|---|
| gfx1100 | ✅ Supported |
Related
More in Scalar Arithmetic
Reference
AMDGPU / GFX ISA
Description
Wait for the VMCNT counter to be at or below the specified level. The VMCNT counter tracks the number of outstanding vector memory loads and atomics that do return data. When in 'all-in-order' mode, wait for all load and store vector memory events.
Example
s_waitcnt_vmcnt null, 0x1234A real instruction accepted by the LLVM assembler, taken verbatim from LLVM's own AMDGPU MC test suite (gfx11). Not from an AMD document, and not authored here.
Sources
- User Guide for AMDGPU Backend ↗ - LLVM Project
- AMD Machine-Readable GPU ISA Specification ↗ - Advanced Micro Devices, Inc.
- LLVM MC assembler tests for AMDGPU (gfx11) ↗ - LLVM Project