[PATCH 00/48] tcg: optimize redundant sign extensions

[Richard Henderson]

Currently, we have support for optimizing redundant zero extensions,
which I think was done with x86 and aarch64 in mind, which zero-extend
all 32-bit operations into the 64-bit register.

But targets like Alpha, MIPS, and RISC-V do sign-extensions instead.
The last 5 patches address this.

But before that, split the quite massive tcg_optimize function.


r~


Richard Henderson (48):
  tcg/optimize: Rename "mask" to "z_mask"
  tcg/optimize: Split out OptContext
  tcg/optimize: Remove do_default label
  tcg/optimize: Change tcg_opt_gen_{mov,movi} interface
  tcg/optimize: Move prev_mb into OptContext
  tcg/optimize: Split out init_arguments
  tcg/optimize: Split out copy_propagate
  tcg/optimize: Split out fold_call
  tcg/optimize: Drop nb_oargs, nb_iargs locals
  tcg/optimize: Change fail return for do_constant_folding_cond*
  tcg/optimize: Return true from tcg_opt_gen_{mov,movi}
  tcg/optimize: Split out finish_folding
  tcg/optimize: Use a boolean to avoid a mass of continues
  tcg/optimize: Split out fold_mb, fold_qemu_{ld,st}
  tcg/optimize: Split out fold_const{1,2}
  tcg/optimize: Split out fold_setcond2
  tcg/optimize: Split out fold_brcond2
  tcg/optimize: Split out fold_brcond
  tcg/optimize: Split out fold_setcond
  tcg/optimize: Split out fold_mulu2_i32
  tcg/optimize: Split out fold_addsub2_i32
  tcg/optimize: Split out fold_movcond
  tcg/optimize: Split out fold_extract2
  tcg/optimize: Split out fold_extract, fold_sextract
  tcg/optimize: Split out fold_deposit
  tcg/optimize: Split out fold_count_zeros
  tcg/optimize: Split out fold_bswap
  tcg/optimize: Split out fold_dup, fold_dup2
  tcg/optimize: Split out fold_mov
  tcg/optimize: Split out fold_xx_to_i
  tcg/optimize: Split out fold_xx_to_x
  tcg/optimize: Split out fold_xi_to_i
  tcg/optimize: Add type to OptContext
  tcg/optimize: Split out fold_to_not
  tcg/optimize: Split out fold_sub_to_neg
  tcg/optimize: Split out fold_xi_to_x
  tcg/optimize: Split out fold_ix_to_i
  tcg/optimize: Split out fold_masks
  tcg/optimize: Expand fold_mulu2_i32 to all 4-arg multiplies
  tcg/optimize: Expand fold_addsub2_i32 to 64-bit ops
  tcg/optimize: Sink commutative operand swapping into fold functions
  tcg/optimize: Add more simplifications for orc
  tcg/optimize: Stop forcing z_mask to "garbage" for 32-bit values
  tcg/optimize: Optimize sign extensions
  tcg/optimize: Propagate sign info for logical operations
  tcg/optimize: Propagate sign info for setcond
  tcg/optimize: Propagate sign info for bit counting
  tcg/optimize: Propagate sign info for shifting

 tcg/optimize.c | 2594 +++++++++++++++++++++++++++++-------------------
 1 file changed, 1577 insertions(+), 1017 deletions(-)

-- 
2.25.1