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Differential D51356

[docs][mips] Clang 7.0 Release notes
ClosedPublic

Authored by atanasyan on Aug 28 2018, 7:00 AM.

Details

Reviewers
hans
petarj
smaksimovic
abeserminji
Commits
rG3c08d653831b: [docs][mips] Clang 7.0 Release notes
rL341201: [docs][mips] Clang 7.0 Release notes
Summary

MIPS specific part of Clang 7.0 Release notes. Feel free to add more notes if I miss something.

Diff Detail

Repository
rL LLVM

Event Timeline

atanasyan created this revision.Aug 28 2018, 7:00 AM
Herald added subscribers: arichardson, sdardis. · View Herald TranscriptAug 28 2018, 7:00 AM
hans accepted this revision.Aug 30 2018, 1:40 AM

lgtm, thanks! Go ahead and commit directly to the branch, or let me know if you'd prefer me to do it.

This revision is now accepted and ready to land.Aug 30 2018, 1:40 AM
sdardis added inline comments.Aug 30 2018, 2:43 AM
ReleaseNotes.rst
121 ↗(On Diff #162850)

`mips3` for 64 bit targets.

D48499.

Closed by commit rL341201: [docs][mips] Clang 7.0 Release notes (authored by atanasyan). · Explain WhyAug 31 2018, 4:26 AM
This revision was automatically updated to reflect the committed changes.
Herald added a subscriber: llvm-commits. · View Herald TranscriptAug 31 2018, 4:27 AM
atanasyan added a comment.Aug 31 2018, 4:29 AM

Thanks for review.

Revision Contents

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cfe/branches/release_70/docs/ReleaseNotes.rst

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- By default, Clang emits an address-significance table into - By default, Clang emits an address-significance table into
every ELF object file when using the integrated assembler. every ELF object file when using the integrated assembler.
Address-significance tables allow linkers to implement `safe ICF Address-significance tables allow linkers to implement `safe ICF
<https://research.google.com/pubs/archive/36912.pdf>`_ without the false <https://research.google.com/pubs/archive/36912.pdf>`_ without the false
positives that can result from other implementation techniques such as positives that can result from other implementation techniques such as
relocation scanning. The ``-faddrsig`` and ``-fno-addrsig`` flags can be relocation scanning. The ``-faddrsig`` and ``-fno-addrsig`` flags can be
used to control whether to emit the address-significance table. used to control whether to emit the address-significance table.
- Integrated assembler is enabled by default on OpenBSD / FreeBSD
for MIPS 64-bit targets.
- On MIPS FreeBSD default CPUs have been changed to ``mips2``
for 32-bit targets and ``mips3`` for 64-bit targets.
- ... - ...
New Compiler Flags New Compiler Flags
------------------ ------------------
- ``-fstrict-float-cast-overflow`` and ``-fno-strict-float-cast-overflow``. - ``-fstrict-float-cast-overflow`` and ``-fno-strict-float-cast-overflow``.
When a floating-point value is not representable in a destination integer When a floating-point value is not representable in a destination integer
type, the code has undefined behavior according to the language standard. By type, the code has undefined behavior according to the language standard. By
default, Clang will not guarantee any particular result in that case. With the default, Clang will not guarantee any particular result in that case. With the
'no-strict' option, Clang attempts to match the overflowing behavior of the 'no-strict' option, Clang attempts to match the overflowing behavior of the
target's native float-to-int conversion instructions. target's native float-to-int conversion instructions.
- ``-fforce-emit-vtables`` and ``-fno-force-emit-vtables``. - ``-fforce-emit-vtables`` and ``-fno-force-emit-vtables``.
In order to improve devirtualization, forces emitting of vtables even in In order to improve devirtualization, forces emitting of vtables even in
modules where it isn't necessary. It causes more inline virtual functions modules where it isn't necessary. It causes more inline virtual functions
to be emitted. to be emitted.
- Added the``-mcrc`` and ``-mno-crc`` flags to enable/disable using
of MIPS Cyclic Redundancy Check instructions.
- Added the``-mvirt`` and ``-mno-virt`` flags to enable/disable using
of MIPS Virtualization instructions.
- Added the``-mginv`` and ``-mno-ginv`` flags to enable/disable using
of MIPS Global INValidate instructions.
- ... - ...
Deprecated Compiler Flags Deprecated Compiler Flags
------------------------- -------------------------
The following options are deprecated and ignored. They will be removed in The following options are deprecated and ignored. They will be removed in
future versions of Clang. future versions of Clang.
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