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X-Received-From: 2607:f8b0:4864:20::442 Subject: [Qemu-devel] [PATCH v3 3/3] target/arm: Rely on hflags correct in cpu_get_tb_cpu_state X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.maydell@linaro.org, cota@braap.org, alex.bennee@linaro.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) This is the payoff. From perf record -g data of ubuntu 18 boot and shutdown: BEFORE: - 23.02% 2.82% qemu-system-aar [.] helper_lookup_tb_ptr - 20.22% helper_lookup_tb_ptr + 10.05% tb_htable_lookup - 9.13% cpu_get_tb_cpu_state 3.20% aa64_va_parameters_both 0.55% fp_exception_el - 11.66% 4.74% qemu-system-aar [.] cpu_get_tb_cpu_state - 6.96% cpu_get_tb_cpu_state 3.63% aa64_va_parameters_both 0.60% fp_exception_el 0.53% sve_exception_el AFTER: - 16.40% 3.40% qemu-system-aar [.] helper_lookup_tb_ptr - 13.03% helper_lookup_tb_ptr + 11.19% tb_htable_lookup 0.55% cpu_get_tb_cpu_state 0.98% 0.71% qemu-system-aar [.] cpu_get_tb_cpu_state 0.87% 0.24% qemu-system-aar [.] rebuild_hflags_a64 Before, helper_lookup_tb_ptr is the second hottest function in the application, consuming almost a quarter of the runtime. Within the entire execution, cpu_get_tb_cpu_state consumes about 12%. After, helper_lookup_tb_ptr has dropped to the fourth hottest function, with consumption dropping to a sixth of the runtime. Within the entire execution, cpu_get_tb_cpu_state has dropped below 1%, and the supporting function to rebuild hflags also consumes about 1%. Assertions are retained for --enable-debug-tcg. Tested-by: Alex Benn=C3=A9e Reviewed-by: Alex Benn=C3=A9e Signed-off-by: Richard Henderson --- v2: Retain asserts for future debugging. --- target/arm/helper.c | 20 +++++++++++++++----- 1 file changed, 15 insertions(+), 5 deletions(-) diff --git a/target/arm/helper.c b/target/arm/helper.c index 1140739d6b..0d19333be0 100644 --- a/target/arm/helper.c +++ b/target/arm/helper.c @@ -14027,19 +14027,29 @@ void HELPER(rebuild_hflags_a64)(CPUARMState *env,= uint32_t el) void cpu_get_tb_cpu_state(CPUARMState *env, target_ulong *pc, target_ulong *cs_base, uint32_t *pflags) { - int current_el =3D arm_current_el(env); - uint32_t flags; + uint32_t flags =3D env->hflags; uint32_t pstate_for_ss; =20 +#ifdef CONFIG_DEBUG_TCG + { + int el =3D arm_current_el(env); + uint32_t check_flags; + if (is_a64(env)) { + check_flags =3D rebuild_hflags_a64(env, el); + } else { + check_flags =3D rebuild_hflags_a32(env, el); + } + g_assert_cmphex(flags, =3D=3D, check_flags); + } +#endif + *cs_base =3D 0; - if (is_a64(env)) { + if (FIELD_EX32(flags, TBFLAG_ANY, AARCH64_STATE)) { *pc =3D env->pc; - flags =3D rebuild_hflags_a64(env, current_el); flags =3D FIELD_DP32(flags, TBFLAG_A64, BTYPE, env->btype); pstate_for_ss =3D env->pstate; } else { *pc =3D env->regs[15]; - flags =3D rebuild_hflags_a32(env, current_el); flags =3D FIELD_DP32(flags, TBFLAG_A32, THUMB, env->thumb); flags =3D FIELD_DP32(flags, TBFLAG_A32, CONDEXEC, env->condexec_bi= ts); flags =3D FIELD_DP32(flags, TBFLAG_A32, VECLEN, env->vfp.vec_len); --=20 2.17.2