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[69.222.133.165]) by smtp.googlemail.com with ESMTPSA id 200sm740660ywq.102.2019.07.10.11.21.32 (version=TLS1_3 cipher=AEAD-AES128-GCM-SHA256 bits=128/128); Wed, 10 Jul 2019 11:21:32 -0700 (PDT) To: Richard Henderson , qemu-devel@nongnu.org References: <20190701043536.26019-1-jan.bobek@gmail.com> <20190701043536.26019-5-jan.bobek@gmail.com> <67fbe51c-ab7c-11e9-ecbc-aa72ff430911@linaro.org> From: Jan Bobek Openpgp: preference=signencrypt Autocrypt: addr=jan.bobek@gmail.com; prefer-encrypt=mutual; keydata= mQINBFbeakcBEACzYOxOXdeT3Ns+5fdSqZFODAb3VXBKQ9DL7ooxLQRhvAx6rKXP/ZkBD7eg q8DJuvx6FbH227wpX+JZQawtolRJO+BTOuyU4ANPn3LGQHNtI78VhjafK7/Geb/9J6mTLl+P iS1EpLjKFbaLQboOaVVCPOHfLJOMNm5Ks9iHVKPQcUWUnroZdm55MIWjRw+wYGpmLD/R+FK/ Cm1fS3j+tu9VYFoEFZmwW//PYzmEtYHpwXA6dOWEd12cu2208/JcEHYBl0Z6Oga0xAk2OxU5 BOELuewGLuSiWik4z594GLVleC2NMnr3gUPl1y8ADrKzQwYmPgytIdsQ0tkV5rK9R1XTk03e ZLViYWJt5dgea+jGWcHPKPfLln53V4nCbwklGFLJQDMo8hL82bjJ7x9bsXoAnkPxJgYHgsM0 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X-Received-From: 2607:f8b0:4864:20::c42 Subject: Re: [Qemu-devel] [RISU RFC PATCH v2 04/14] risugen_x86: add module X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: =?UTF-8?Q?Alex_Benn=c3=a9e?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --rIRX2k0kxhmz2gCo0RJ0YrNbjqHDWYd7w Content-Type: multipart/mixed; boundary="hNMYSFAknIMTKxyOANuUS461wRwp9KDoX"; protected-headers="v1" From: Jan Bobek To: Richard Henderson , qemu-devel@nongnu.org Cc: =?UTF-8?Q?Alex_Benn=c3=a9e?= Message-ID: <5260d896-37e3-e6f0-1ed4-b5d09bf9fbcd@gmail.com> Subject: Re: [RISU RFC PATCH v2 04/14] risugen_x86: add module References: <20190701043536.26019-1-jan.bobek@gmail.com> <20190701043536.26019-5-jan.bobek@gmail.com> <67fbe51c-ab7c-11e9-ecbc-aa72ff430911@linaro.org> In-Reply-To: <67fbe51c-ab7c-11e9-ecbc-aa72ff430911@linaro.org> --hNMYSFAknIMTKxyOANuUS461wRwp9KDoX Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 7/3/19 12:11 PM, Richard Henderson wrote: > On 7/1/19 6:35 AM, Jan Bobek wrote: >> +sub write_mov_rr($$) >> +{ >> + my ($r1, $r2) =3D @_; >> + >> + my %insn =3D (opcode =3D> X86OP_MOV, >> + modrm =3D> {mod =3D> MOD_DIRECT, >> + reg =3D> ($r1 & 0x7), >> + rm =3D> ($r2 & 0x7)}); >> + >> + $insn{rex}{w} =3D 1 if $is_x86_64; >> + $insn{rex}{r} =3D 1 if $r1 >=3D 8; >> + $insn{rex}{b} =3D 1 if $r2 >=3D 8; >=20 > This is where maybe it's better to leave rex.[rb] to risugen_x86_asm, a= nd just > leave $modrm{reg} and $modrm{rm} as 4-bit quantities. That's what I have in v3, stay tuned! >> +sub write_mov_reg_imm($$) >> +{ >> + my ($reg, $imm) =3D @_; >> + my %insn; >> + >> + if (0 <=3D $imm && $imm <=3D 0xffffffff) { >=20 > Should include !$is_x86_64 here, >=20 >> + %insn =3D (opcode =3D> {value =3D> 0xB8 | ($reg & 0x7), len =3D= > 1}, >> + imm =3D> {value =3D> $imm, len =3D> 4}); >> + } elsif (-0x80000000 <=3D $imm && $imm <=3D 0x7fffffff) { >> + %insn =3D (opcode =3D> {value =3D> 0xC7, len =3D> 1}, >> + modrm =3D> {mod =3D> MOD_DIRECT, >> + reg =3D> 0, rm =3D> ($reg & 0x7)}, >> + imm =3D> {value =3D> $imm, len =3D> 4}); >> + >> + $insn{rex}{w} =3D 1 if $is_x86_64; >=20 > making this unconditional. Doesn't B8 (without REX.W) work for x86_64, too? It zeroes the upper part of the destination, so it's effectively zero-extending, and it's one byte shorter than C7 (no ModR/M byte needed). That being said, I moved most of this function to risugen_x86_asm and included a bunch of comments regarding different cases, so it should be easier to understand. >> +sub write_random_ymmdata() >> +{ >> + my $ymm_cnt =3D $is_x86_64 ? 16 : 8; >> + my $ymm_len =3D 32; >> + my $datalen =3D $ymm_cnt * $ymm_len; >> + >> + # Generate random data blob >> + write_random_datablock($datalen); >> + >> + # Load the random data into YMM regs. >> + for (my $ymm_reg =3D 0; $ymm_reg < $ymm_cnt; $ymm_reg++) { >> + write_insn(vex =3D> {l =3D> VEX_L_256, p =3D> VEX_P_DATA16, >> + r =3D> !($ymm_reg >=3D 8)}, >=20 > Again, vex.r should be handled in vex_encode. As I said, there will be more high-level instruction-assembling functions exported by risugen_x86_asm in v3, which take care of this. >> + opcode =3D> X86OP_VMOVAPS, >> + modrm =3D> {mod =3D> MOD_INDIRECT_DISP32, >> + reg =3D> ($ymm_reg & 0x7), >> + rm =3D> REG_EAX}, >> + disp =3D> {value =3D> $ymm_reg * $ymm_len, >> + len =3D> 4}); >> + } >=20 > So... this now generates code that cannot run without AVX2. >=20 > Which is probably fine for testing right now, since we do > want to be able to notice effects of SSE/AVX insns on the > high bits of the registers. >=20 > But we'll probably need to have the same --xsave=3Dfoo > command-line option that we have for risu itself. >=20 > That would let you initialize only 16-bytes here, or > for avx512 initialize 64-bytes, plus the k-registers. Ah yes, indeed. -Jan --hNMYSFAknIMTKxyOANuUS461wRwp9KDoX-- --rIRX2k0kxhmz2gCo0RJ0YrNbjqHDWYd7w Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEESPYOqtMR3qRZrEutZeg2ldrjNs8FAl0mLKsACgkQZeg2ldrj Ns+4dg//VmVzK8vFWAxJcT6xHoUmMRQvPKDmO9h0uRqVnmQDM9AoPTc8Kk0fPKB5 gprFz1nmOAoOX3A2DHuh7o9KrCTZRM6RNCzXWI/9g+k2DswQpBxHmmDJZnXM9/45 CNRXv8RswzKLCqDgOEpEcZlQGXn5elOcmYb+O4otZyW/aHIt1x4baC/R/+mfnulG OHJyA96K5YftYgX/k7YLAHAyBZKHM4PFUCNYkazo/dklZ68O62E9KSDJsst6q48p BOdxlvhRCbsTntGWZU4ZBJJl2I48bfiJPoR/UWbDzg0vlTDvYnQr+xYKdQ31jHDf j0xSLXaKo0V6y2VJyi8JBboUjzIbkLA2wTTEuGXcIPOEF8HGGK5kMx+iugWdMFEJ 4/Qg5SikJA5ljOGqfbKtgC6Xvbokbb+YmOYuFT0Qb82mQgj75R0HmHtYZf7O5vKM 2ab8NcprT4zL2UHaRiY9quIXV3IBDdIZoWvCbNdPv3zOzq1chJGHUjM98mqBKN+6 F+7/iLYFeYyBwgm2UJXOTnr4KsoN8imLtTICK7aBhFIh/0hfBcRNKNYvb8VciyvR cQ9+d06cUU9us5XTbSzHbPH0FasK8Sa+RHsNoCRBE3dRVf7hHXrfucplWR849AlK +1cgcTW6FfD2PpyMrPD+BrrmS/EQia8heutdlS5UTA07Kh1pKrM= =x168 -----END PGP SIGNATURE----- --rIRX2k0kxhmz2gCo0RJ0YrNbjqHDWYd7w--