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[X86] Update release notes for -mtune support.

This commit is contained in:
Craig Topper 2020-08-26 15:58:38 -07:00
parent 82875dcf9b
commit 2d13693bfc
2 changed files with 10 additions and 0 deletions
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5
clang/docs/ReleaseNotes.rst
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@ -190,6 +190,11 @@ X86 Support in Clang
- Support for -march=sapphirerapids was added. - Support for -march=sapphirerapids was added.
- The -mtune command line option is no longer ignored for X86. This can be used
to request microarchitectural optimizations independent on -march. -march=<cpu>
implies -mtune=<cpu>. -mtune=generic is the default with no -march or -mtune
specified.
Internal API Changes Internal API Changes
-------------------- --------------------

5
llvm/docs/ReleaseNotes.rst
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@ -101,6 +101,11 @@ During this release ...
* The assembler now has support for {disp32} and {disp8} pseudo prefixes for * The assembler now has support for {disp32} and {disp8} pseudo prefixes for
controlling displacement size for memory operands and jump displacements. The controlling displacement size for memory operands and jump displacements. The
assembler also supports the .d32 and .d8 mnemonic suffixes to do the same. assembler also supports the .d32 and .d8 mnemonic suffixes to do the same.
* A new function attribute "tune-cpu" has been added to support -mtune like gcc.
This allows microarchitectural optimizations to be applied independent from
the "target-cpu" attribute or TargetMachine CPU which will be used to select
Instruction Set. If the attribute is not present, the tune CPU will follow
the target CPU.
Changes to the AMDGPU Target Changes to the AMDGPU Target
----------------------------- -----------------------------