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[83.57.175.68]) by smtp.gmail.com with ESMTPSA id t9sm15791314wrw.76.2021.02.14.10.00.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 14 Feb 2021 10:00:34 -0800 (PST) From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= To: qemu-devel@nongnu.org Subject: [RFC PATCH 16/42] target/mips/tx79: Introduce PSUB* opcodes (Parallel Subtract) Date: Sun, 14 Feb 2021 18:58:46 +0100 Message-Id: <20210214175912.732946-17-f4bug@amsat.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210214175912.732946-1-f4bug@amsat.org> References: <20210214175912.732946-1-f4bug@amsat.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2a00:1450:4864:20::330; envelope-from=philippe.mathieu.daude@gmail.com; helo=mail-wm1-x330.google.com X-Spam_score_int: -14 X-Spam_score: -1.5 X-Spam_bar: - X-Spam_report: (-1.5 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.249, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action 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: Fredrik Noring , Aleksandar Rikalo , Richard Henderson , Laurent Vivier , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Thomas Huth , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Aurelien Jarno , "Maciej W. Rozycki" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Introduce the 'Parallel Subtract' opcodes: - PSUBB (Parallel Subtract Byte) - PSUBH (Parallel Subtract Halfword) - PSUBW (Parallel Subtract Word) Signed-off-by: Philippe Mathieu-Daudé --- target/mips/tx79.decode | 6 ++++ target/mips/tx79_translate.c | 61 ++++++++++++++++++++++++++++++++++++ 2 files changed, 67 insertions(+) diff --git a/target/mips/tx79.decode b/target/mips/tx79.decode index 26c80b9bce5..d1c07c7d901 100644 --- a/target/mips/tx79.decode +++ b/target/mips/tx79.decode @@ -29,6 +29,12 @@ MTHI1 011100 ..... 0000000000 00000 010001 @rs MFLO1 011100 0000000000 ..... 00000 010010 @rd MTLO1 011100 ..... 0000000000 00000 010011 @rs +# MMI0 + +PSUBW 011100 ..... ..... ..... 00001 001000 @rs_rt_rd +PSUBH 011100 ..... ..... ..... 00101 001000 @rs_rt_rd +PSUBB 011100 ..... ..... ..... 01001 001000 @rs_rt_rd + # MMI2 PCPYLD 011100 ..... ..... ..... 01110 001001 @rs_rt_rd diff --git a/target/mips/tx79_translate.c b/target/mips/tx79_translate.c index 28d07baaa73..23146f6bfac 100644 --- a/target/mips/tx79_translate.c +++ b/target/mips/tx79_translate.c @@ -115,6 +115,67 @@ static bool trans_MTLO1(DisasContext *ctx, arg_rtype *a) * PSUBUW rd, rs, rt Parallel Subtract with Unsigned saturation Word */ +static bool trans_parallel_substract(DisasContext *ctx, arg_rtype *a, unsigned wlen) +{ + TCGv_i64 ax, bx, t0, t1, t2; + + if (a->rd == 0) { + /* nop */ + return true; + } + + ax = tcg_temp_new_i64(); + bx = tcg_temp_new_i64(); + t0 = tcg_temp_new_i64(); + t1 = tcg_temp_new_i64(); + t2 = tcg_temp_new_i64(); + + /* Lower halve */ + gen_load_gpr(ax, a->rs); + gen_load_gpr(bx, a->rt); + for (int i = 0; i < (64 / wlen); i++) { + tcg_gen_sextract_i64(t0, ax, wlen * i, wlen); + tcg_gen_sextract_i64(t1, bx, wlen * i, wlen); + tcg_gen_sub_i64(t2, t0, t1); + tcg_gen_deposit_i64(cpu_gpr[a->rd], cpu_gpr[a->rd], t2, wlen * i, wlen); + } + /* Upper halve */ + gen_load_gpr_hi(ax, a->rs); + gen_load_gpr_hi(bx, a->rt); + for (int i = 0; i < (64 / wlen); i++) { + tcg_gen_sextract_i64(t0, ax, wlen * i, wlen); + tcg_gen_sextract_i64(t1, bx, wlen * i, wlen); + tcg_gen_sub_i64(t2, t0, t1); + tcg_gen_deposit_i64(cpu_gpr_hi[a->rd], cpu_gpr_hi[a->rd], t2, wlen * i, wlen); + } + + tcg_temp_free(t2); + tcg_temp_free(t1); + tcg_temp_free(t0); + tcg_temp_free(bx); + tcg_temp_free(ax); + + return true; +} + +/* Parallel Subtract Byte */ +static bool trans_PSUBB(DisasContext *ctx, arg_rtype *a) +{ + return trans_parallel_substract(ctx, a, 8); +} + +/* Parallel Subtract Halfword */ +static bool trans_PSUBH(DisasContext *ctx, arg_rtype *a) +{ + return trans_parallel_substract(ctx, a, 16); +} + +/* Parallel Subtract Word */ +static bool trans_PSUBW(DisasContext *ctx, arg_rtype *a) +{ + return trans_parallel_substract(ctx, a, 32); +} + /* * Min/Max (4 instructions) * ------------------------ -- 2.26.2