[Qemu-devel] [PATCH for-next 00/15] Collection of improvements for tcg/ppc64

[Richard Henderson <rth@twiddle.net>]

About half of these patches are focused on reducing the number of
full 64-bit constants that need to be generated for addresses:

E.g. patch 5, looking through the function descriptor.  If the
program is built --disable-pie, the elements of the function
descriptors are all 32-bit constants.

E.g. the end result of indirect jump threading + TCG_REG_TB.
Before, we reserve 6 insn slots to generate the full 64-bit address.
After, we use 2 insns -- addis + ld -- to load the full 64-bit
address from the indirection slot.

The second patch could probably be reverted.  I'd planned to be
able to use the same conditional call + tail call scheme as ARM,
but I'd forgotten the need for a conditional store to go along
with that.  OTOH, it might still turn out to be useful somewhere.


r~


Richard Henderson (15):
  tcg-ppc64: Avoid code for nop move
  tcg-ppc64: Add an LK argument to tcg_out_call
  tcg-ppc64: Use the branch absolute instruction when possible
  tcg-ppc64: Don't load the static chain from TCG
  tcg-ppc64: Look through the function descriptor when profitable
  tcg-ppc64: Move AREG0 to r31
  tcg-ppc64: Tidy register allocation order
  tcg-ppc64: Create PowerOpcode
  tcg-ppc64: Handle long offsets better
  tcg-ppc64: Use indirect jump threading
  tcg-ppc64: Setup TCG_REG_TB
  tcg-ppc64: Use TCG_REG_TB in tcg_out_movi and tcg_out_mem_long
  tcg-ppc64: Tidy tcg_target_qemu_prologue
  tcg-ppc64: Streamline tcg_out_tlb_read
  tcg-ppc64: Implement CONFIG_QEMU_LDST_OPTIMIZATION

 configure               |    2 +-
 include/exec/exec-all.h |    7 +-
 tcg/ppc64/tcg-target.c  | 1079 ++++++++++++++++++++++++++---------------------
 tcg/ppc64/tcg-target.h  |    2 +-
 4 files changed, 598 insertions(+), 492 deletions(-)

-- 
1.8.3.1