v_mqsad_u32_u8 GPU Native ISA AMD Vector

V MQSAD U32 U8 Vector Arithmetic

v_mqsad_u32_u8

Perform the V_MSAD_U8 operation four times using different slices of the first array, all entries of the second array and each entry of the third…

Encoding

Verified bit-level encoding data is not yet available for this instruction. The instruction-format classification below (VOP3) is well-documented and stable; exact per-target opcode/field bit positions have not yet been imported from a verified source.
Format VOP3
Execution Unit

Operands

Operand details have not yet been curated for this instruction.

GFX Target Compatibility

TargetSupport
gfx1100✅ Supported

Related

More in Vector Arithmetic

Reference

AMDGPU / GFX ISA

Description

Perform the V_MSAD_U8 operation four times using different slices of the first array, all entries of the second array and each entry of the third array. Pack each 32-bit value into a 4-entry array and store the array into a vector register. The first input is an 8-entry array of unsigned 8-bit integers, the second input is a 4-entry array of unsigned 8-bit integers and the third input is a 4-entry array of unsigned 32-bit integers.

Semantics

tmp[127 : 96] = 32'B(v_msad_u8(S0[55 : 24], S1[31 : 0], S2[127 : 96].u32)); tmp[95 : 64] = 32'B(v_msad_u8(S0[47 : 16], S1[31 : 0], S2[95 : 64].u32)); tmp[63 : 32] = 32'B(v_msad_u8(S0[39 : 8], S1[31 : 0], S2[63 : 32].u32)); tmp[31 : 0] = 32'B(v_msad_u8(S0[31 : 0], S1[31 : 0], S2[31 : 0].u32)); D0.b128 = tmp.b128

Example

v_mqsad_u32_u8 v[5:8], -1, -1, v[252:255]

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