From: "Alex Bennée" <alex.bennee@linaro.org>
To: qemu-arm@nongnu.org
Cc: laurent.desnogues@gmail.com, peter.maydell@linaro.org,
qemu-devel@nongnu.org
Subject: Re: [PATCH v6 14/20] target/arm: Hoist store to cs_base in cpu_get_tb_cpu_state
Date: Mon, 14 Oct 2019 19:51:25 +0100 [thread overview]
Message-ID: <87blujma8i.fsf@linaro.org> (raw)
In-Reply-To: <20191011155546.14342-15-richard.henderson@linaro.org>
Richard Henderson <richard.henderson@linaro.org> writes:
> By performing this store early, we avoid having to save and restore
> the register holding the address around any function calls.
Been peeking at the assembly again ;-)
>
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
> ---
> target/arm/helper.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/target/arm/helper.c b/target/arm/helper.c
> index 3f7d3f257d..37424e3d4d 100644
> --- a/target/arm/helper.c
> +++ b/target/arm/helper.c
> @@ -11225,6 +11225,7 @@ void cpu_get_tb_cpu_state(CPUARMState *env, target_ulong *pc,
> {
> uint32_t flags, pstate_for_ss;
>
> + *cs_base = 0;
> flags = rebuild_hflags_internal(env);
>
> if (is_a64(env)) {
> @@ -11298,7 +11299,6 @@ void cpu_get_tb_cpu_state(CPUARMState *env, target_ulong *pc,
> }
>
> *pflags = flags;
> - *cs_base = 0;
> }
>
> #ifdef TARGET_AARCH64
--
Alex Bennée
next prev parent reply other threads:[~2019-10-14 18:52 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-11 15:55 [PATCH v6 00/20] target/arm: Reduce overhead of cpu_get_tb_cpu_state Richard Henderson
2019-10-11 15:55 ` [PATCH v6 01/20] target/arm: Split out rebuild_hflags_common Richard Henderson
2019-10-11 15:55 ` [PATCH v6 02/20] target/arm: Split out rebuild_hflags_a64 Richard Henderson
2019-10-14 15:43 ` Alex Bennée
2019-10-11 15:55 ` [PATCH v6 03/20] target/arm: Split out rebuild_hflags_common_32 Richard Henderson
2019-10-14 15:53 ` Alex Bennée
2019-10-11 15:55 ` [PATCH v6 04/20] target/arm: Split arm_cpu_data_is_big_endian Richard Henderson
2019-10-14 16:01 ` Alex Bennée
2019-10-11 15:55 ` [PATCH v6 05/20] target/arm: Split out rebuild_hflags_m32 Richard Henderson
2019-10-14 16:13 ` Alex Bennée
2019-10-11 15:55 ` [PATCH v6 06/20] target/arm: Reduce tests vs M-profile in cpu_get_tb_cpu_state Richard Henderson
2019-10-14 16:17 ` Alex Bennée
2019-10-11 15:55 ` [PATCH v6 07/20] target/arm: Split out rebuild_hflags_a32 Richard Henderson
2019-10-14 16:17 ` Alex Bennée
2019-10-11 15:55 ` [PATCH v6 08/20] target/arm: Split out rebuild_hflags_aprofile Richard Henderson
2019-10-14 16:19 ` Alex Bennée
2019-10-11 15:55 ` [PATCH v6 09/20] target/arm: Hoist XSCALE_CPAR, VECLEN, VECSTRIDE in cpu_get_tb_cpu_state Richard Henderson
2019-10-14 16:39 ` Alex Bennée
2019-10-11 15:55 ` [PATCH v6 10/20] target/arm: Simplify set of PSTATE_SS " Richard Henderson
2019-10-14 18:21 ` Alex Bennée
2019-10-11 15:55 ` [PATCH v6 11/20] target/arm: Hoist computation of TBFLAG_A32.VFPEN Richard Henderson
2019-10-14 18:46 ` Alex Bennée
2019-10-11 15:55 ` [PATCH v6 12/20] target/arm: Add arm_rebuild_hflags Richard Henderson
2019-10-14 18:47 ` Alex Bennée
2019-10-11 15:55 ` [PATCH v6 13/20] target/arm: Split out arm_mmu_idx_el Richard Henderson
2019-10-14 18:49 ` Alex Bennée
2019-10-11 15:55 ` [PATCH v6 14/20] target/arm: Hoist store to cs_base in cpu_get_tb_cpu_state Richard Henderson
2019-10-14 18:51 ` Alex Bennée [this message]
2019-10-11 15:55 ` [PATCH v6 15/20] target/arm: Add HELPER(rebuild_hflags_{a32, a64, m32}) Richard Henderson
2019-10-14 18:59 ` Alex Bennée
2019-10-11 15:55 ` [PATCH v6 16/20] target/arm: Rebuild hflags at EL changes Richard Henderson
2019-10-14 19:01 ` Alex Bennée
2019-10-11 15:55 ` [PATCH v6 17/20] target/arm: Rebuild hflags at MSR writes Richard Henderson
2019-10-14 19:03 ` Alex Bennée
2019-10-11 15:55 ` [PATCH v6 18/20] target/arm: Rebuild hflags at CPSR writes Richard Henderson
2019-10-14 19:08 ` Alex Bennée
2019-10-14 19:15 ` Richard Henderson
2019-10-11 15:55 ` [PATCH v6 19/20] target/arm: Rebuild hflags for M-profile Richard Henderson
2019-10-14 19:08 ` Alex Bennée
2019-10-11 15:55 ` [PATCH v6 20/20] target/arm: Rely on hflags correct in cpu_get_tb_cpu_state Richard Henderson
2019-10-17 15:26 ` [PATCH v6 00/20] target/arm: Reduce overhead of cpu_get_tb_cpu_state Peter Maydell
2019-10-17 16:25 ` Richard Henderson
2019-10-17 17:01 ` Peter Maydell
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