• Hao Xu's avatar
    [compiler] Improve reduction of Word64Comparisons · 1e98dd91
    Hao Xu authored
    Add "k <= (x >> n) to (k << n) <= x" reduction to Word64Comparisons.
    This can help to reduce the below codes:
    
      45: Int64Constant[164]
      39: Load[kRepTaggedSigned|kTypeInt32](...)
      40: BitcastTaggedToWordForTagAndSmiBits(39)
      41: TruncateInt64ToInt32(40)
      42: ChangeInt32ToInt64(41)
      43: Word64Sar[ShiftOutZeros](42, 29)
      46: Uint64LessThan(45, 43)
    
    into:
    
      4530: Int32Constant[328]
      39: Load[kRepTaggedSigned|kTypeInt32](...)
      40: BitcastTaggedToWordForTagAndSmiBits(39)
      41: TruncateInt64ToInt32(40)
      46: Uint32LessThan(4530, 41)
    
    Change-Id: I6ca802c9bb3c941c689ebbcb4ae3072501555266
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3793464
    Commit-Queue: Hao A Xu <hao.a.xu@intel.com>
    Reviewed-by: 's avatarNico Hartmann <nicohartmann@chromium.org>
    Cr-Commit-Position: refs/heads/main@{#82210}
    1e98dd91
Name
Last commit
Last update
..
benchmarks Loading commit data...
bigint Loading commit data...
cctest Loading commit data...
common Loading commit data...
debugger Loading commit data...
debugging Loading commit data...
fuzzer Loading commit data...
fuzzilli Loading commit data...
inspector Loading commit data...
intl Loading commit data...
js-perf-test Loading commit data...
memory Loading commit data...
message Loading commit data...
mjsunit Loading commit data...
mkgrokdump Loading commit data...
mozilla Loading commit data...
test262 Loading commit data...
torque Loading commit data...
unittests Loading commit data...
wasm-api-tests Loading commit data...
wasm-js Loading commit data...
wasm-spec-tests Loading commit data...
webkit Loading commit data...
BUILD.gn Loading commit data...
OWNERS Loading commit data...