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Simon Tatham 02449f9c3c [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
.github Add github lockdown app to auto-close pull requests. 2019-06-25 22:51:46 +00:00
clang [clang] Add DISuprogram and DIE for a func decl 2019-06-27 06:44:44 +00:00
clang-tools-extra [clangd] No need to setTraversalScope in SemanticHighlighting. 2019-06-27 12:22:18 +00:00
compiler-rt [GWP-ASan] D63736 broke ARMv7/v8 sanitizer bots. 2019-06-26 22:24:15 +00:00
debuginfo-tests Make nrvo-string test more robust. 2019-06-26 20:04:09 +00:00
libclc travis: Add LLVM-8 build 2019-03-27 21:28:31 +00:00
libcxx Revert "Change the ABI version and ABI namespace to be `_LIBCPP_VERSION`" 2019-06-26 00:05:14 +00:00
libcxxabi [demangle] Special case clang's creative mangling of __uuidof expressions. 2019-06-18 23:34:09 +00:00
libunwind [libunwind][AArch64] Fix libunwind::Registers_arm64::jumpto 2019-06-17 11:00:21 +00:00
lld [LLD][ELF] - Replace invalid-e_shnum.s with YAML based version. 2019-06-27 12:23:38 +00:00
lldb [lldb] [Plugins/SysV-x86_64] NetBSD is also using SysV ABI 2019-06-27 07:09:51 +00:00
llgo IR: Support parsing numeric block ids, and emit them in textual output. 2019-03-22 18:27:13 +00:00
llvm [ARM] Tighten restrictions on use of SP in v8.1-M CSEL. 2019-06-27 12:40:40 +00:00
openmp Fixed memory use-after-free problem. 2019-06-26 18:11:26 +00:00
parallel-libs Fix typos throughout the license files that somehow I and my reviewers 2019-01-21 09:52:34 +00:00
polly [test] Add wrap flags after D61934. 2019-06-17 19:17:07 +00:00
pstl [pstl] Default to the serial backend when unspecified 2019-06-20 17:56:51 +00:00
.arcconfig Update monorepo .arcconfig with new project callsign. 2019-01-31 14:34:59 +00:00
.clang-format Add .clang-tidy and .clang-format files to the toplevel of the 2019-01-29 16:43:16 +00:00
.clang-tidy Disable tidy checks with too many hits 2019-02-01 11:20:13 +00:00
.gitignore Add a reduced copy of the llvm .gitignore 2019-04-09 00:52:49 +00:00
README.md
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README.md

The LLVM Compiler Infrastructure

This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments.