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Simon Atanasyan d4d892ff9f [mips] Accept 32-bit offsets for lb and lbu commands 
`lb` and `lbu` commands accepts 16-bit signed offsets. But GAS accepts
larger offsets for these commands. If an offset does not fit in 16-bit
range, `lb` command is translated into lui/lb or lui/addu/lb series.
It's interesting that initially LLVM assembler supported this feature,
but later it was broken.

This patch restores support for 32-bit offsets. It replaces `mem_simm16`
operand for `LB` and `LBu` definitions by the new `mem_simmptr` operand.
This operand is intended to check that offset fits to the same size as
using for pointers. Later we will be able to extend this rule and
accepts 64-bit offsets when it is possible.

Some issues remain:
- The regression also affects LD, SD, LH, LHU commands. I'm going
  to fix them by a separate patch.

- GAS accepts any 32-bit values as an offset. Now LLVM accepts signed
  16-bit values and this patch extends the range to signed 32-bit offsets.
  In other words, the following code accepted by GAS and still triggers
  an error by LLVM:
```
  lb      $4, 0x80000004

  # gas
  lui     a0, 0x8000
    lb      a0, 4(a0)
```

- In case of 64-bit pointers GAS accepts a 64-bit offset and translates
  it to the li/dsll/lb series of commands. LLVM still rejects it.
  Probably this feature has never been implemented in LLVM. This issue
  is for a separate patch.
```
  lb      $4, 0x800000001

  # gas
  li      a0, 0x8000
  dsll    a0, a0, 0x14
  lb      a0, 4(a0)
```

Differential Revision: https://reviews.llvm.org/D45020

llvm-svn: 330983
 		2018-04-26 19:55:28 +00:00
clang Add getDeserializationListener to ASTReader 2018-04-26 15:09:13 +00:00
clang-tools-extra [clangd] Add "str()" method to SymbolID. 2018-04-25 15:27:09 +00:00
compiler-rt Add s390x to XFAIL for illegal_read/write_test.cc 2018-04-25 19:34:48 +00:00
debuginfo-tests [Darwin] Specify DWARF 2/4 when running apple accelerator tests. 2018-02-26 20:56:45 +00:00
libclc relational/select: Condition types for half are short/ushort, not char/uchar 2018-04-25 17:36:36 +00:00
libcxx Move old test into test/libcxx, and implement new version of test for ostreambuf_iterator::failed. Fixes PR#37245. Thanks to Billy O'Neill for the bug report. 2018-04-26 16:16:45 +00:00
libcxxabi [libc++abi] Replace __sync_* functions with __libcpp_atomic_* functions. 2018-04-16 22:00:14 +00:00
libunwind [cmake] Remove duplicate command line options from build 2018-04-05 20:27:50 +00:00
lld Delete unused variable. 2018-04-26 19:21:07 +00:00
lldb [debugserver] Return 'ios' instead of 'iphoneos' for the ostype. 2018-04-25 22:12:12 +00:00
llgo irgen: Create functions instead of global variables for builtin hash and equal algorithms. 2017-06-04 22:11:28 +00:00
llvm [mips] Accept 32-bit offsets for lb and lbu commands 2018-04-26 19:55:28 +00:00
openmp [OpenMP] Remove compilation warning when using clang to compile bc files. 2018-04-26 14:06:53 +00:00
parallel-libs [Axccel] Remove -Wno-missing-braces in build 2016-12-19 21:34:07 +00:00
polly [CodeGen] Fix comment. NFC. 2018-04-25 19:54:16 +00:00
README.md Add an svn project to contain the files that appear at the root of the 2017-10-19 21:09:49 +00:00

README.md

Low Level Virtual Machine (LLVM)

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