[PATCH v2 0/8] target/sparc: Use tcg_gen_lookup_and_goto_ptr

[Richard Henderson]

Changes from v1:
  * Split into teeny weeny pieces.

  * It turns out the sparc_tr_tb_stop hunk of v1 was buggy,
    in that things that are not simple branches use DYNAMIC_PC,
    e.g. the RETT (return from trap) instruction.

    Introduce DYNAMIC_PC_LOOKUP to distinguish the couple of
    places where we have a dynamic pc, but no other change
    of state (conditional branches, JMPL, RETURN).

  * Drop the change for WRFPRS, because it's too infrequent.
    The WRASI change affects memcpy/memset, so that's more important.

Boots Mark's sol8 install cdrom.  :-)

Top of the profile changes from

    41.55%  qemu-system-sparc              [.] cpu_exec_loop
    14.02%  qemu-system-sparc              [.] cpu_tb_exec
     8.74%  qemu-system-sparc              [.] tb_lookup
     2.11%  qemu-system-sparc              [.] tcg_splitwx_to_rw
     1.63%  memfd:tcg-jit (deleted)        [.] 0x0000000000000004

to

    31.59%  qemu-system-sparc              [.] helper_lookup_tb_ptr
    17.79%  qemu-system-sparc              [.] tb_lookup
     5.38%  qemu-system-sparc              [.] compute_all_sub
     2.38%  qemu-system-sparc              [.] helper_compute_psr
     2.36%  qemu-system-sparc              [.] helper_check_align
     1.79%  memfd:tcg-jit (deleted)        [.] 0x000000000063fc8e

This probably indicates that cpu_get_tb_cpu_state could be
improved to not consume so much overhead.


r~


Richard Henderson (8):
  target/sparc: Use tcg_gen_lookup_and_goto_ptr in gen_goto_tb
  target/sparc: Fix npc comparison in sparc_tr_insn_start
  target/sparc: Drop inline markers from translate.c
  target/sparc: Introduce DYNAMIC_PC_LOOKUP
  target/sparc: Use DYNAMIC_PC_LOOKUP for conditional branches
  target/sparc: Use DYNAMIC_PC_LOOKUP for JMPL
  target/sparc: Use DYNAMIC_PC_LOOKUP for v9 RETURN
  target/sparc: Use tcg_gen_lookup_and_goto_ptr for v9 WRASI

 target/sparc/translate.c | 410 ++++++++++++++++++++++-----------------
 1 file changed, 233 insertions(+), 177 deletions(-)

-- 
2.34.1