v_fmac_legacy_f32 GPU Native ISA AMD Vector

V FMAC LEGACY F32 Vector Arithmetic

v_fmac_legacy_f32

Multiply two single-precision values and accumulate the result with the destination. Follows DX9 rules where 0.0 times anything produces 0.0.

Encoding

Verified bit-level encoding data is not yet available for this instruction. The instruction-format classification below (VOP2) is well-documented and stable; exact per-target opcode/field bit positions have not yet been imported from a verified source.
Format VOP2
Execution Unit

Operands

Operand details have not yet been curated for this instruction.

GFX Target Compatibility

Per-target GFX compatibility has not yet been verified for this instruction.

Related

More in Vector Arithmetic

Reference

AMDGPU / GFX ISA

Example

v_fmac_legacy_f32 v5, -1, v2

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