[all-commits] [llvm/llvm-project] ddfbca: Clang/MIPS: Use -mnan value for -mabs if not speci...

[YunQiang Su via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ddfbca8b08941125b48039236a03635252298611
      https://github.com/llvm/llvm-project/commit/ddfbca8b08941125b48039236a03635252298611
  Author: YunQiang Su <wzssyqa at gmail.com>
  Date:   2024-01-03 (Wed, 03 Jan 2024)

  Changed paths:
    M clang/lib/Driver/ToolChains/Arch/Mips.cpp
    M clang/test/Driver/mips-features.c

  Log Message:
  -----------
  Clang/MIPS: Use -mnan value for -mabs if not specified (#71157)

On most hardware, FCSR.ABS2008 is set the value same with FCSR.NAN2008.
Let's use this behaivor by default.

With this commit, `clang -target mips -mnan=2008 -c fabs.c` will imply
`-mabs=2008`.

And of course, `clang -mnan=2008 -mabs=legacy` can continue workable
like previous.

Co-authored-by: YunQiang Su <yunqiang.su at cipunited.com>