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tensorcrush
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* [AGC] Decode VOP3P and emit packed f16 arithmetic (first slice) On gfx10 the VOP3P family lives under its own 0b110011000 prefix (word0 top byte 0xCC), which the major-opcode switch currently routes to the SMEM branch, so packed instructions were decoded as scalar memory ops and emitted as silent no-ops. Intercept the exact 9-bit prefix ahead of the switch, decode the five packed-f16 arithmetic opcodes with their op_sel/op_sel_hi/neg_lo/neg_hi/clamp modifiers, and emit them as UnpackHalf2x16 -> component-wise f32 vec2 ops -> PackHalf2x16 so no Float16 capability is needed. Bit layout and opcode numbers pinned to LLVM MC test encodings (vop3p.s, gfx10_vop3p_literalv216.txt) and VOP3PInstructions.td. Unsupported modifiers, packed constants and out-of-scope packed opcodes fail with a clear error instead of emitting wrong results. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * [AGC] Make packed f16 exact and drop v_pk_fma_f16 (review response) Address the FP16 correctness review on the VOP3P slice. Replace GLSL UnpackHalf2x16/PackHalf2x16 with explicit integer f16<->f32 conversions (EmitHalfToFloat/EmitFloatToHalf): exact widening with subnormal normalisation, and narrowing with round-to-nearest-even, overflow-to-Inf and NaN/Inf handling. Their subnormal and rounding behaviour no longer depends on implementation-defined float-controls modes. With exact conversions, v_pk_add_f16 and v_pk_mul_f16 are bit-exact to a true f16 op (f32 result rounds losslessly to f16; a f16 product fits in f32). Emit v_pk_min_f16/v_pk_max_f16 as fminnum_like/fmaxnum_like (NaN operand returns the other; ordered numeric compare) instead of GLSL FMin/FMax. v_pk_fma_f16 now fails emission loudly: a fused f16 FMA rounds once, an f32 multiply-add then pack double-rounds (fma(0x4100,0x7522,0x04EA) is 0x7A6B fused vs 0x7A6A via f32). Exact fused emulation is a planned follow-up slice. ShaderDump gains an Expect model (Translates/DecodeFails/EmitFails) and packed regressions: arith, non-default modifiers, and loud-failure pins for the fma case above and for clamp. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> --------- Co-authored-by: tensorcrush <tensorcrush@users.noreply.github.com> Co-authored-by: Claude Fable 5 <noreply@anthropic.com> Co-authored-by: Antigravity AI <antigravity@gemini.com>