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target/ppc: Increment PMC5 with inline insns

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Profiling QEMU during Fedora 35 for PPC64 boot revealed that
6.39% of total time was being spent in helper_insns_inc(), on a
POWER9 machine. To avoid calling this helper every time PMCs had
to be incremented, an inline implementation of PMC5 increment and
check for overflow was developed. This led to a reduction of
about 12% in Fedora's boot time.

Signed-off-by: Leandro Lupori <leandro.lupori@eldorado.org.br>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Message-Id: <20221025202424.195984-4-leandro.lupori@eldorado.org.br>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
This commit is contained in:
Leandro Lupori 2022-10-25 17:24:24 -03:00 • committed by Daniel Henrique Barboza
parent 8b3d1c49a9
commit eeaaefe9fa
4 changed files with 69 additions and 41 deletions
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3
target/ppc/power8-pmu.h
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@ -14,6 +14,9 @@
#define POWER8_PMU_H
#if defined(TARGET_PPC64) && !defined(CONFIG_USER_ONLY)
#define PMC_COUNTER_NEGATIVE_VAL 0x80000000UL
void cpu_ppc_pmu_init(CPUPPCState *env);
void pmu_update_summaries(CPUPPCState *env);
#else