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[X86] Update release notes for -mtune support.

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This commit is contained in:
Craig Topper 2020-08-26 15:58:38 -07:00
parent dbabc094e5
commit 7a5934b151
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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
controlling displacement size for memory operands and jump displacements. The
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
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