s_get_barrier_state GPU Native ISA AMD Scalar

Scalar Arithmetic

s_get_barrier_state

AMDGPU SOP1 scalar instruction. (Format and name extracted from LLVM's AMDGPU backend source - semantics not yet curated.)

Encoding

Binary Layout (AMD CDNA 5)
101111101
31:23
SDST
22:16
01010000
15:8
SSRC0
7:0
 

The ENC_SOP1 layout from AMD's machine-readable ISA specification (AMD CDNA 5). Opcode 80 in OP rebuilds 0xBE805000, an identifier AMD lists for this encoding. No other generation in the specification defines this instruction.

Format SOP1
Width 32 bits
Opcode 80
Identifier 0xBE805000

Operands

  • SDST
    Written. Any scalar GPR operand including VCC and NULL. Data format: 32 bits of arbitrary data. (OPR_SREG, FMT_NUM_B32)
  • SSRC0
    Read. N/A Data format: 32 bits of arbitrary data. (OPR_SSRC_BARRIER_ID, FMT_NUM_B32)

In AMD's order, as its machine-readable ISA specification lists them for the ENC_SOP1 encoding (AMD CDNA 5).

GFX Target Compatibility

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

Related

More in Scalar Arithmetic

Reference

AMDGPU / GFX ISA

Example

s_get_barrier_state s0, 0

A real instruction accepted by the LLVM assembler, taken verbatim from LLVM's own AMDGPU MC test suite (gfx13_asm_sop1.s). Not from an AMD document, and not authored here.

Sources