ds_rsub_u64 GPU Native ISA AMD Vector
DS RSUB U64 LDS / Data Share
ds_rsub_u64
Subtract an unsigned 64-bit integer value stored in a location in a data share from a value stored in the data register.
Encoding
Verified bit-level encoding data is not yet available for this instruction.
The instruction-format classification below (DS)
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 LDS / Data Share
Reference
AMDGPU / GFX ISA
Semantics
addr = CalcDsAddr(ADDR.b32, OFFSET0.b32, OFFSET1.b32);
tmp = MEM[addr].u64;
MEM[addr].u64 = DATA.u64 - MEM[addr].u64;
RETURN_DATA.u64 = tmp
Example
ds_rsub_u64 v1, v[2:3]A 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 Instinct MI300" Instruction Set Architecture: Reference Guide ↗
- Advanced Micro Devices, Inc.
Reference Guide, page 438. - LLVM MC assembler tests for AMDGPU (gfx11) ↗ - LLVM Project