[PATCH v7 00/20] target/arm: Reduce overhead of cpu_get_tb_cpu_state

[Richard Henderson]

Changes since v6:
  * Regen hflags in two more places for m-profile (patch 19).

Changes since v5:
  * Fix the debug assertion ifdef in the final patch.
  * Add more calls to arm_rebuild_hflags: CPSR and M-profile
    These become two new patches, 18 & 19.
  * Update some comments per review. (Alex)

Changes since v4:
  * Split patch 1 into 15 smaller patches.
  * Cache the new DEBUG_TARGET_EL field.
  * Split out m-profile hflags separately from a-profile 32-bit.
  * Move around non-cached tb flags as well, avoiding repetitive
    checks for m-profile or other mutually exclusive conditions.

  I haven't officially re-run the performance test quoted in the
  last patch, but I have eyeballed "perf top", and have dug into
  the compiled code a bit, which resulted in a few of the new
  cleanup patches (e.g. cs_base, arm_mmu_idx_el, and
  arm_cpu_data_is_big_endian).
...


r~


Richard Henderson (20):
  target/arm: Split out rebuild_hflags_common
  target/arm: Split out rebuild_hflags_a64
  target/arm: Split out rebuild_hflags_common_32
  target/arm: Split arm_cpu_data_is_big_endian
  target/arm: Split out rebuild_hflags_m32
  target/arm: Reduce tests vs M-profile in cpu_get_tb_cpu_state
  target/arm: Split out rebuild_hflags_a32
  target/arm: Split out rebuild_hflags_aprofile
  target/arm: Hoist XSCALE_CPAR, VECLEN, VECSTRIDE in
    cpu_get_tb_cpu_state
  target/arm: Simplify set of PSTATE_SS in cpu_get_tb_cpu_state
  target/arm: Hoist computation of TBFLAG_A32.VFPEN
  target/arm: Add arm_rebuild_hflags
  target/arm: Split out arm_mmu_idx_el
  target/arm: Hoist store to cs_base in cpu_get_tb_cpu_state
  target/arm: Add HELPER(rebuild_hflags_{a32,a64,m32})
  target/arm: Rebuild hflags at EL changes
  target/arm: Rebuild hflags at MSR writes
  target/arm: Rebuild hflags at CPSR writes
  target/arm: Rebuild hflags for M-profile.
  target/arm: Rely on hflags correct in cpu_get_tb_cpu_state

 target/arm/cpu.h           |  84 +++++---
 target/arm/helper.h        |   4 +
 target/arm/internals.h     |   9 +
 hw/intc/armv7m_nvic.c      |   1 +
 linux-user/syscall.c       |   1 +
 target/arm/cpu.c           |   1 +
 target/arm/helper-a64.c    |   3 +
 target/arm/helper.c        | 383 ++++++++++++++++++++++++-------------
 target/arm/m_helper.c      |   6 +
 target/arm/machine.c       |   1 +
 target/arm/op_helper.c     |   4 +
 target/arm/translate-a64.c |  13 +-
 target/arm/translate.c     |  33 +++-
 13 files changed, 368 insertions(+), 175 deletions(-)

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2.17.1