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Simon Tatham ca741d996f [ARM] Tighten restrictions on use of SP in v8.1-M CSEL. 
In the `CSEL Rd,Rm,Rn` instruction family (also including CSINC, CSINV
and CSNEG), the architecture lists it as CONSTRAINED UNPREDICTABLE
(i.e. SoftFail) to use SP in the Rd or Rm slot, but outright illegal
to use it in the Rn slot, not least because some encodings of that
form are used by MVE instructions such as UQRSHLL.

MC was treating all three slots the same, as SoftFail. So the only
reason UQRSHLL was disassembled correctly at all was because the MVE
decode table is separate from the Thumb2 one and takes priority; if
you turned off MVE, then encodings such as `[0x5f,0xea,0x0d,0x83]`
would disassemble as spurious CSELs.

Fixed by inventing another version of the `GPRwithZR` register class,
which disallows SP completely instead of just SoftFailing it.

Reviewers: DavidSpickett, ostannard

Subscribers: javed.absar, kristof.beyls, hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D63862

llvm-svn: 364531
2019-06-27 12:40:40 +00:00
benchmarks
bindings [IR/DIVar] Add the flag for params that have unmodified value 2019-06-26 11:19:26 +00:00
cmake [cmake] Allow config.guess to be run with MSYS on Windows 2019-06-26 22:07:43 +00:00
docs [MachineFunction] Base support for call site info tracking 2019-06-27 07:48:06 +00:00
examples Add a HowToUseLLJIT example project. 2019-05-22 21:38:41 +00:00
include [Attributor] Deducing existing nounwind attribute. 2019-06-27 11:27:54 +00:00
lib [ARM] Tighten restrictions on use of SP in v8.1-M CSEL. 2019-06-27 12:40:40 +00:00
projects
resources
runtimes Setup testing target dependencies for default runtimes 2019-06-11 00:25:57 +00:00
test [ARM] Tighten restrictions on use of SP in v8.1-M CSEL. 2019-06-27 12:40:40 +00:00
tools [yaml2obj] - Allow overriding e_shentsize, e_shoff, e_shnum and e_shstrndx fields in the YAML. 2019-06-27 11:08:42 +00:00
unittests BitStream reader: propagate errors 2019-06-26 19:50:12 +00:00
utils gn build: Follow-up to r364491 "[GN] Update build files" 2019-06-27 06:08:57 +00:00
.arcconfig
.clang-format
.clang-tidy Disable tidy checks with too many hits 2019-02-01 11:20:13 +00:00
.gitattributes
.gitignore gitignore: Ignore Qt Creator project configuration files. NFC 2019-06-12 08:28:31 +00:00
CMakeLists.txt build: extract LLVM distribution target handling 2019-06-14 18:28:57 +00:00
CODE_OWNERS.TXT
configure
CREDITS.TXT [test commit] Add my name to the CREDITS.TXT 2019-05-27 07:48:28 +00:00
LICENSE.TXT Fix typos throughout the license files that somehow I and my reviewers 2019-01-21 09:52:34 +00:00
llvm.spec.in
LLVMBuild.txt
README.txt Testing commit access 2019-02-19 20:38:51 +00:00
RELEASE_TESTERS.TXT

README.txt 

The LLVM Compiler Infrastructure
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Please see the documentation provided in docs/ for further
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