[all-commits] [llvm/llvm-project] 5813fc: [Lsan] Use fp registers to search for pointers

[Vitaly Buka via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 5813fca1076089c835de737834955a0fe7eb3898
      https://github.com/llvm/llvm-project/commit/5813fca1076089c835de737834955a0fe7eb3898
  Author: Vitaly Buka <vitalybuka at google.com>
  Date:   2020-09-17 (Thu, 17 Sep 2020)

  Changed paths:
    M compiler-rt/lib/sanitizer_common/sanitizer_stoptheworld_linux_libcdep.cpp
    M compiler-rt/test/lsan/TestCases/use_registers.cpp
    A compiler-rt/test/lsan/TestCases/use_registers_extra.cpp

  Log Message:
  -----------
  [Lsan] Use fp registers to search for pointers

X86 can use xmm registers for pointers operations. e.g. for std::swap.
I don't know yet if it's possible on other platforms.

NT_X86_XSTATE includes all registers from NT_FPREGSET so
the latter used only if the former is not available. I am not sure how
reasonable to expect that but LLD has such fallback in
NativeRegisterContextLinux_x86_64::ReadFPR.

Reviewed By: morehouse

Differential Revision: https://reviews.llvm.org/D87754