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[0/3] gimple-fold improvements

Message ID 20211111194116.1626980-1-siddhesh@gotplt.org
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Siddhesh Poyarekar Nov. 11, 2021, 7:41 p.m. UTC 
  This patchset improves folding in cases where input lengths
and/or destination sizes may not be constant but are range bound.

Tested on x86_64 with a full bootstrap build and verified that there are
no regressions resulting from this patchset.

Also tested a build of bash, which results in 3 __memcpy_chk calls being
optimized away completely in addition to a couple of memmove and strcpy
chk variants being transformed into regular calls.

Siddhesh Poyarekar (3):
  gimple-fold: Transform stp*cpy_chk to str*cpy directly
  gimple-fold: Use ranges to simplify _chk calls
  gimple-fold: Use ranges to simplify strncat and snprintf

 gcc/gimple-fold.c                       | 312 +++++++++---------------
 gcc/testsuite/gcc.dg/Wobjsize-1.c       |   5 +-
 gcc/testsuite/gcc.dg/fold-stringops-1.c |  23 ++
 gcc/testsuite/gcc.dg/fold-stringops-2.c |  63 +++++
 gcc/testsuite/gcc.dg/fold-stringops-3.c |  18 ++
 5 files changed, 220 insertions(+), 201 deletions(-)
 create mode 100644 gcc/testsuite/gcc.dg/fold-stringops-1.c
 create mode 100644 gcc/testsuite/gcc.dg/fold-stringops-2.c
 create mode 100644 gcc/testsuite/gcc.dg/fold-stringops-3.c