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[v3,00/48] tcg: optimize redundant sign extensions

Message ID 20211021210539.825582-1-richard.henderson@linaro.org
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Series tcg: optimize redundant sign extensions | expand

Message

Richard Henderson Oct. 21, 2021, 9:04 p.m. UTC 
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.

But before that, split the quite massive tcg_optimize function.


r~


Changes for v3:
  * Fix brcond2 bug (luis)
  * Fix fold_count_zeros typo.
  * Rebase and fix up int128.h conflict.

Changes for v2:
  * Rebase, adjusting MemOpIdx renaming.
  * Apply r-b and some feedback (f4bug).


Patches lacking review:
  17-tcg-optimize-Split-out-fold_brcond2.patch
  20-tcg-optimize-Split-out-fold_mulu2_i32.patch
  21-tcg-optimize-Split-out-fold_addsub2_i32.patch
  22-tcg-optimize-Split-out-fold_movcond.patch
  23-tcg-optimize-Split-out-fold_extract2.patch
  24-tcg-optimize-Split-out-fold_extract-fold_sextract.patch
  25-tcg-optimize-Split-out-fold_deposit.patch
  26-tcg-optimize-Split-out-fold_count_zeros.patch
  28-tcg-optimize-Split-out-fold_dup-fold_dup2.patch
  33-tcg-optimize-Add-type-to-OptContext.patch
  34-tcg-optimize-Split-out-fold_to_not.patch
  35-tcg-optimize-Split-out-fold_sub_to_neg.patch
  36-tcg-optimize-Split-out-fold_xi_to_x.patch
  37-tcg-optimize-Split-out-fold_ix_to_i.patch
  38-tcg-optimize-Split-out-fold_masks.patch
  39-tcg-optimize-Expand-fold_mulu2_i32-to-all-4-arg-m.patch
  41-tcg-optimize-Sink-commutative-operand-swapping-in.patch
  42-tcg-optimize-Add-more-simplifications-for-orc.patch
  43-tcg-optimize-Stop-forcing-z_mask-to-garbage-for-3.patch
  44-tcg-optimize-Optimize-sign-extensions.patch
  46-tcg-optimize-Propagate-sign-info-for-setcond.patch
  47-tcg-optimize-Propagate-sign-info-for-bit-counting.patch
  48-tcg-optimize-Propagate-sign-info-for-shifting.patch



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 | 2600 +++++++++++++++++++++++++++++-------------------
 1 file changed, 1583 insertions(+), 1017 deletions(-)

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2.25.1