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target/arm: Optimize cpu_mmu_index

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We now cache the core mmu_idx in env->hflags.  Rather than recompute
from scratch, extract the field.  All of the uses of cpu_mmu_index
within target/arm are within helpers, and env->hflags is always stable
within a translation block from whence helpers are called.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20200302175829.2183-3-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2020-03-05 16:09:20 +00:00 committed by Peter Maydell
parent 3e270f67f0
commit fb901c905d
2 changed files with 13 additions and 15 deletions
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23
target/arm/cpu.h
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@ -2943,16 +2943,6 @@ typedef enum ARMMMUIdxBit {
#define MMU_USER_IDX 0
/**
* cpu_mmu_index:
* @env: The cpu environment
* @ifetch: True for code access, false for data access.
*
* Return the core mmu index for the current translation regime.
* This function is used by generic TCG code paths.
*/
int cpu_mmu_index(CPUARMState *env, bool ifetch);
/* Indexes used when registering address spaces with cpu_address_space_init */
typedef enum ARMASIdx {
ARMASIdx_NS = 0,
@ -3232,6 +3222,19 @@ FIELD(TBFLAG_A64, BTYPE, 10, 2) /* Not cached. */
FIELD(TBFLAG_A64, TBID, 12, 2)
FIELD(TBFLAG_A64, UNPRIV, 14, 1)
/**
* cpu_mmu_index:
* @env: The cpu environment
* @ifetch: True for code access, false for data access.
*
* Return the core mmu index for the current translation regime.
* This function is used by generic TCG code paths.
*/
static inline int cpu_mmu_index(CPUARMState *env, bool ifetch)
{
return FIELD_EX32(env->hflags, TBFLAG_ANY, MMUIDX);
}
static inline bool bswap_code(bool sctlr_b)
{
#ifdef CONFIG_USER_ONLY

5
target/arm/helper.c
View file

@ -12274,11 +12274,6 @@ ARMMMUIdx arm_mmu_idx(CPUARMState *env)
return arm_mmu_idx_el(env, arm_current_el(env));
}
int cpu_mmu_index(CPUARMState *env, bool ifetch)
{
return arm_to_core_mmu_idx(arm_mmu_idx(env));
}
#ifndef CONFIG_USER_ONLY
ARMMMUIdx arm_stage1_mmu_idx(CPUARMState *env)
{