s_wqm_b64 GPU Native ISA AMD Scalar
S WQM B64 Scalar Arithmetic
s_wqm_b64
Given an active pixel mask in a scalar input, calculate whole quad mode mask for that input, store the result into a scalar register and set SCC iff…
Encoding
Verified bit-level encoding data is not yet available for this instruction.
The instruction-format classification below (SOP1)
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 an active pixel mask in a scalar input, calculate whole quad mode mask for that input, store the result into a scalar register and set SCC iff the result is nonzero. In whole quad mode, if any pixel in a quad is active then all pixels of the quad are marked active.
Semantics
tmp = 0ULL;
declare i : 6'U;
for i in 6'0U : 6'63U do
tmp[i] = S0.u64[i & 6'60U +: 6'4U] != 0ULL
endfor;
D0.u64 = tmp;
SCC = D0.u64 != 0ULL
Example
s_wqm_b64 s[0:1], 0A 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 116. - LLVM MC assembler tests for AMDGPU (gfx11) ↗ - LLVM Project