v_cubesc_f32 GPU Native ISA AMD Vector

V CUBESC F32 Vector Arithmetic

v_cubesc_f32

Compute the cubemap S coordinate of a 3D coordinate specified as three single-precision float inputs.

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

Compute the cubemap S coordinate of a 3D coordinate specified as three single-precision float inputs. Store the result in single-precision float format into a vector register.

Semantics

// D0.f = cubemap S coordinate. // XYZ coordinate is given in (S0.f, S1.f, S2.f). // S0.f = x // S1.f = y // S2.f = z if ((abs(S2.f32) >= abs(S0.f32)) && (abs(S2.f32) >= abs(S1.f32))) then if S2.f32 < 0.0F then D0.f32 = -S0.f32 else D0.f32 = S0.f32 endif elsif abs(S1.f32) >= abs(S0.f32) then D0.f32 = S0.f32 else if S0.f32 < 0.0F then D0.f32 = S2.f32 else D0.f32 = -S2.f32 endif endif

Example

v_cubesc_f32 v5, v1, v2, s3

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