s_lshr_b64 GPU Native ISA AMD Scalar
S LSHR B64 Scalar Arithmetic
s_lshr_b64
Given a shift count in the second scalar input, calculate the logical shift right of the first scalar input, store the result into a scalar register…
Encoding
Verified bit-level encoding data is not yet available for this instruction.
The instruction-format classification below (SOP2)
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
Given a shift count in the second scalar input, calculate the logical shift right of the first scalar input, store the result into a scalar register and set SCC iff the result is nonzero.
Semantics
D0.u64 = (S0.u64 >> S1[5 : 0].u32);
SCC = D0.u64 != 0ULL
Example
s_lshr_b64 s[0:1], 0, s4A 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 103. - LLVM MC assembler tests for AMDGPU (gfx11) ↗ - LLVM Project