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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::333; envelope-from=richard.henderson@linaro.org; helo=mail-wm1-x333.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1662465631004100001 Content-Type: text/plain; charset="utf-8" We do not modify any general-purpose registers in BCR, which means that we may be able to avoid saving the value across a branch. Signed-off-by: Richard Henderson --- target/s390x/tcg/translate.c | 10 ++++++++++ target/s390x/tcg/insn-data.def | 2 +- 2 files changed, 11 insertions(+), 1 deletion(-) diff --git a/target/s390x/tcg/translate.c b/target/s390x/tcg/translate.c index e6c7c2a6ae..b27e34f712 100644 --- a/target/s390x/tcg/translate.c +++ b/target/s390x/tcg/translate.c @@ -5704,6 +5704,16 @@ static void in2_r2_nz(DisasContext *s, DisasOps *o) } #define SPEC_in2_r2_nz 0 =20 +static void in2_r2_o_nz(DisasContext *s, DisasOps *o) +{ + int r2 =3D get_field(s, r2); + if (r2 !=3D 0) { + o->in2 =3D regs[r2]; + o->g_in2 =3D true; + } +} +#define SPEC_in2_r2_o_nz 0 + static void in2_r2_8s(DisasContext *s, DisasOps *o) { o->in2 =3D tcg_temp_new_i64(); diff --git a/target/s390x/tcg/insn-data.def b/target/s390x/tcg/insn-data.def index 6d2cfe5fa2..682d1d292d 100644 --- a/target/s390x/tcg/insn-data.def +++ b/target/s390x/tcg/insn-data.def @@ -121,7 +121,7 @@ /* BRANCH INDIRECT ON CONDITION */ C(0xe347, BIC, RXY_b, MIE2,0, m2_64w, 0, 0, bc, 0) /* BRANCH ON CONDITION */ - C(0x0700, BCR, RR_b, Z, 0, r2_nz, 0, 0, bc, 0) + C(0x0700, BCR, RR_b, Z, 0, r2_o_nz, 0, 0, bc, 0) C(0x4700, BC, RX_b, Z, 0, a2, 0, 0, bc, 0) /* BRANCH RELATIVE ON CONDITION */ C(0xa704, BRC, RI_c, Z, 0, 0, 0, 0, bc, 0) --=20 2.34.1