s_barrier_wait GPU Native ISA AMD Scalar

Branch & Control

s_barrier_wait

Wait for a barrier to complete. The SIMM16 argument specifies which barrier to wait on.

Encoding

Binary Layout (AMD CDNA 5)
101111111
31:23
0010100
22:16
SIMM16
15:0
 

The ENC_SOPP layout from AMD's machine-readable ISA specification (AMD CDNA 5). Opcode 20 in OP rebuilds 0xBF940000, an identifier AMD lists for this encoding. The same in AMD RDNA 4.

Format SOPP
Width 32 bits
Opcode 20
Identifier 0xBF940000

Operands

  • SIMM16
    Read. 16-bit integer constant. Data format: 16 bits of arbitrary data. (OPR_SIMM16, FMT_NUM_B16)

In AMD's order, as its machine-readable ISA specification lists them for the ENC_SOPP encoding (AMD CDNA 5).

GFX Target Compatibility

Per-target GFX compatibility has not yet been verified for this instruction.

Related

More in Branch & Control

Reference

AMDGPU / GFX ISA

Example

s_barrier_wait 0

A real instruction accepted by the LLVM assembler, taken verbatim from LLVM's own AMDGPU MC test suite (gfx13_asm_sopp.s). Not from an AMD document, and not authored here.

Sources