This series makes some further unwinder improvements. Unfortunately,
not many targets define __LIBGCC_DWARF_REG_SIZES_CONSTANT__; x86-64
does, and it makes uw_install_context_1 quite a bit faster because GCC
no longer has to emit generic memcpy code for it. In general, it may be
worthwhile to replace this code with target-specific implementations.
Tested on powerpc64le-linux-gnu, x86_64-linux-gnu; I didn't see any test
result differences. Built GCC for msp430-elf, too.
The revision for the patch I posted earlier (using SWAR techniques for
get_cie_encoding) is not ready yet and probably won't make GCC 13. It
requires some header cleanups first.
Thanks,
Florian
Florian Weimer (3):
Compute a table of DWARF register sizes at compile
Define __LIBGCC_DWARF_REG_SIZES_CONSTANT__ if DWARF register size is
constant
libgcc: Specialize execute_cfa_program in DWARF unwinder for
alignments
gcc/c-family/c-cppbuiltin.cc | 8 +
gcc/config/msp430/msp430.cc | 11 +-
gcc/config/rs6000/rs6000.cc | 14 +-
gcc/debug.h | 2 +
gcc/doc/tm.texi | 7 +-
gcc/dwarf2cfi.cc | 116 +++++-----
gcc/target.def | 8 +-
libgcc/unwind-dw2-execute_cfa.h | 322 ++++++++++++++++++++++++++++
libgcc/unwind-dw2.c | 360 ++++++--------------------------
9 files changed, 472 insertions(+), 376 deletions(-)
create mode 100644 libgcc/unwind-dw2-execute_cfa.h
base-commit: 5d060d8b0477ff4911f41c816281daaa24b41a13
--
2.38.1
