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148c7f286c
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Greg Fitzgerald 148c7f286c Fix inline assembly that switches between ARM and Thumb modes 
This patch restores the ARM mode if the user's inline assembly
does not.  In the object streamer, it ensures that instructions
following the inline assembly are encoded correctly and that
correct mapping symbols are emitted.  For the asm streamer, it
emits a .arm or .thumb directive.

This patch does not ensure that the inline assembly contains
the ADR instruction to switch modes at runtime.

The problem we need to solve is code like this:

  int foo(int a, int b) {
    int r = a + b;
    asm volatile(
        ".align 2     \n"
        ".arm         \n"
        "add r0,r0,r0 \n"
    : : "r"(r));
    return r+1;
  }

If we compile this function in thumb mode then the inline assembly
will switch to arm mode. We need to make sure that we switch back to
thumb mode after emitting the inline assembly or we will incorrectly
encode the instructions that follow (i.e. the assembly instructions
for return r+1).

Based on patch by David Peixotto

Change-Id: Ib57f6d2d78a22afad5de8693fba6230ff56ba48b

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199818 91177308-0d34-0410-b5e6-96231b3b80d8
2014-01-22 18:32:35 +00:00
autoconf Use a heavier hammer when --enable-libcpp is passed to bypass the tests 2014-01-15 21:21:48 +00:00
bindings Makefile.ocaml: Tweak to use --system-libs. 2013-12-20 00:36:59 +00:00
cmake Don't clobber CMAKE_REQUIRED_FLAGS, it ends up being used in 2014-01-21 18:09:19 +00:00
docs Revert my commit in r199620 that added sections about namespaces to the 2014-01-20 10:15:32 +00:00
examples [cleanup] Re-sort the examples #include lines with my sort_includes 2014-01-13 09:58:03 +00:00
include Fix inline assembly that switches between ARM and Thumb modes 2014-01-22 18:32:35 +00:00
lib Fix inline assembly that switches between ARM and Thumb modes 2014-01-22 18:32:35 +00:00
projects Revert "Revert "Windows: Add support for unicode command lines"" 2013-10-07 01:00:07 +00:00
test Fix inline assembly that switches between ARM and Thumb modes 2014-01-22 18:32:35 +00:00
tools Don't open or fstat files twice in llvm-ar. 2014-01-22 16:43:45 +00:00
unittests [APInt] Fix nearestLogBase2 to return correct answers for very large APInt and APInt with a bitwidth of 1. 2014-01-19 20:33:48 +00:00
utils ]x86] Allow segment and address-size overrides for CMPS[BWLQ] (PR9385) 2014-01-22 15:08:36 +00:00
.arcconfig Add .arcconfig to the repository. Useful if someone wants to use phabricator's command line tool. 2012-12-01 12:07:58 +00:00
.clang-format Add a clang-format file so that the tool can automatically detect the 2013-09-02 07:19:04 +00:00
.gitignore Add extra vim swap file pattern 2012-10-09 23:48:34 +00:00
CMakeLists.txt [CMake] Introduce new scheme of LLVM_TOOLS_BINARY_DIR and LLVM_LIBRARY_DIR 2014-01-19 12:52:10 +00:00
CODE_OWNERS.TXT Update email address. 2013-12-04 09:42:49 +00:00
configure Use a heavier hammer when --enable-libcpp is passed to bypass the tests 2014-01-15 21:21:48 +00:00
CREDITS.TXT Fix documentation typos 2013-12-20 00:33:39 +00:00
LICENSE.TXT Update the copyright credits -- Happy new year 2014! 2014-01-01 08:27:31 +00:00
llvm.spec.in
LLVMBuild.txt Remove the very substantial, largely unmaintained legacy PGO 2013-10-02 15:42:23 +00:00
Makefile Fix bad variable syntax in r199413 2014-01-17 00:40:39 +00:00
Makefile.common Makefile.common: Update a description, s/Source/SOURCES/ , according to MakefileGuide.html#control-variables . 2012-12-07 01:43:23 +00:00
Makefile.config.in Add an autoconf option for turning on -gsplit-dwarf by default 2013-06-25 01:12:25 +00:00
Makefile.rules [Mips]Work around MIPS linker issues exposed by commit r198087 until bug 18360 is resolved 2014-01-03 22:18:43 +00:00
README.txt Revert "Test commit to check e-mail address. Please discard this." 2013-10-04 10:59:13 +00:00

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