diff options
Diffstat (limited to 'src/emu/cpu/rsp/vcl.h')
-rw-r--r-- | src/emu/cpu/rsp/vcl.h | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/src/emu/cpu/rsp/vcl.h b/src/emu/cpu/rsp/vcl.h new file mode 100644 index 00000000000..e82a7fde162 --- /dev/null +++ b/src/emu/cpu/rsp/vcl.h @@ -0,0 +1,65 @@ +// license:BSD-3-Clause +// copyright-holders:Tyler J. Stachecki,Ryan Holtz + +inline rsp_vec_t vec_vcl(rsp_vec_t vs, rsp_vec_t vt, rsp_vec_t zero, rsp_vec_t *ge, rsp_vec_t *le, rsp_vec_t eq, rsp_vec_t sign, rsp_vec_t vce) +{ + // sign_negvt = sign ? -vt : vt + rsp_vec_t sign_negvt = _mm_xor_si128(vt, sign); + sign_negvt = _mm_sub_epi16(sign_negvt, sign); + + // Compute diff, diff_zero, ncarry, and nvce: + // Note: diff = sign ? (vs + vt) : (vs - vt). + rsp_vec_t diff = _mm_sub_epi16(vs, sign_negvt); + rsp_vec_t ncarry = _mm_adds_epu16(vs, vt); + ncarry = _mm_cmpeq_epi16(diff, ncarry); + rsp_vec_t nvce = _mm_cmpeq_epi16(vce, zero); + rsp_vec_t diff_zero = _mm_cmpeq_epi16(diff, zero); + + // Compute results for if (sign && ne): + rsp_vec_t le_case1 = _mm_and_si128(diff_zero, ncarry); + le_case1 = _mm_and_si128(nvce, le_case1); + rsp_vec_t le_case2 = _mm_or_si128(diff_zero, ncarry); + le_case2 = _mm_and_si128(vce, le_case2); + rsp_vec_t le_eq = _mm_or_si128(le_case1, le_case2); + + // Compute results for if (!sign && ne): + rsp_vec_t ge_eq = _mm_subs_epu16(vt, vs); + ge_eq = _mm_cmpeq_epi16(ge_eq, zero); + + // Blend everything together. Caveat: we don't update + // the results of ge/le if ne is false, so be careful. + rsp_vec_t do_le = _mm_andnot_si128(eq, sign); +#if (defined(__SSE4_1__) || defined(_MSC_VER)) + *le = _mm_blendv_epi8(*le, le_eq, do_le); +#else + le_eq = _mm_and_si128(do_le, le_eq); + *le = _mm_andnot_si128(do_le, *le); + *le = _mm_or_si128(le_eq, *le); +#endif + + rsp_vec_t do_ge = _mm_or_si128(sign, eq); +#if (defined(__SSE4_1__) || defined(_MSC_VER)) + *ge = _mm_blendv_epi8(ge_eq, *ge, do_ge); +#else + *ge = _mm_and_si128(do_ge, *ge); + ge_eq = _mm_andnot_si128(do_ge, ge_eq); + *ge = _mm_or_si128(ge_eq, *ge); +#endif + + // Mux the result based on the value of sign. +#if (defined(__SSE4_1__) || defined(_MSC_VER)) + rsp_vec_t mux_mask = _mm_blendv_epi8(*ge, *le, sign); +#else + do_le = _mm_and_si128(sign, *le); + do_ge = _mm_andnot_si128(sign, *ge); + rsp_vec_t mux_mask = _mm_or_si128(do_le, do_ge); +#endif + +#if (defined(__SSE4_1__) || defined(_MSC_VER)) + return _mm_blendv_epi8(vs, sign_negvt, mux_mask); +#else + sign_negvt = _mm_and_si128(mux_mask, sign_negvt); + vs = _mm_andnot_si128(mux_mask, vs); + return _mm_or_si128(sign_negvt, vs); +#endif +} |