Message ID | 20190819213755.26175-12-richard.henderson@linaro.org |
---|---|
State | New |
Headers | show
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[97.113.7.119]) by smtp.gmail.com with ESMTPSA id d2sm13446951pjs.21.2019.08.19.14.38.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 19 Aug 2019 14:38:10 -0700 (PDT) From: Richard Henderson <richard.henderson@linaro.org> To: qemu-devel@nongnu.org Date: Mon, 19 Aug 2019 14:36:58 -0700 Message-Id: <20190819213755.26175-12-richard.henderson@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190819213755.26175-1-richard.henderson@linaro.org> References: <20190819213755.26175-1-richard.henderson@linaro.org> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::644 Subject: [Qemu-devel] [PATCH v2 11/68] target/arm: Simplify op_smlawx for SMLAW* X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: <qemu-devel.nongnu.org> List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>, <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe> List-Archive: <https://lists.nongnu.org/archive/html/qemu-devel> List-Post: <mailto:qemu-devel@nongnu.org> List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help> List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>, <mailto:qemu-devel-request@nongnu.org?subject=subscribe> Cc: peter.maydell@linaro.org, qemu-arm@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" <qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org> |
Series |
target/arm: Convert aa32 base isa to decodetree
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expand
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On Mon, 19 Aug 2019 at 22:38, Richard Henderson <richard.henderson@linaro.org> wrote: > > By shifting the 16-bit input left by 16, we can align the desired > portion of the 48-bit product and use tcg_gen_muls2_i32. > > Signed-off-by: Richard Henderson <richard.henderson@linaro.org> > --- > target/arm/translate.c | 16 ++++++++-------- > 1 file changed, 8 insertions(+), 8 deletions(-) > Reviewed-by: Peter Maydell <peter.maydell@linaro.org> thanks -- PMM
diff --git a/target/arm/translate.c b/target/arm/translate.c index 8557ef831f..9a2fb7d3aa 100644 --- a/target/arm/translate.c +++ b/target/arm/translate.c @@ -8213,7 +8213,6 @@ DO_SMLAX(SMLALTT, 2, 1, 1) static bool op_smlawx(DisasContext *s, arg_rrrr *a, bool add, bool mt) { TCGv_i32 t0, t1; - TCGv_i64 t64; if (!ENABLE_ARCH_5TE) { return false; @@ -8221,16 +8220,17 @@ static bool op_smlawx(DisasContext *s, arg_rrrr *a, bool add, bool mt) t0 = load_reg(s, a->rn); t1 = load_reg(s, a->rm); + /* + * Since the nominal result is product<47:16>, shift the 16-bit + * input up by 16 bits, so that the result is at product<63:32>. + */ if (mt) { - tcg_gen_sari_i32(t1, t1, 16); + tcg_gen_andi_i32(t1, t1, 0xffff0000); } else { - gen_sxth(t1); + tcg_gen_shli_i32(t1, t1, 16); } - t64 = gen_muls_i64_i32(t0, t1); - tcg_gen_shri_i64(t64, t64, 16); - t1 = tcg_temp_new_i32(); - tcg_gen_extrl_i64_i32(t1, t64); - tcg_temp_free_i64(t64); + tcg_gen_muls2_i32(t0, t1, t0, t1); + tcg_temp_free_i32(t0); if (add) { t0 = load_reg(s, a->ra); gen_helper_add_setq(t1, cpu_env, t1, t0);
By shifting the 16-bit input left by 16, we can align the desired portion of the 48-bit product and use tcg_gen_muls2_i32. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> --- target/arm/translate.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-)