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Kristof Beyls d1cee9b3bc Fix large stack alignment codegen for ARM and Thumb2 targets 
This partially fixes PR13007 (ARM CodeGen fails with large stack
alignment): for ARM and Thumb2 targets, but not for Thumb1, as it
seems stack alignment for Thumb1 targets hasn't been supported at
all.

Producing an aligned stack pointer is done by zero-ing out the lower
bits of the stack pointer. The BIC instruction was used for this.
However, the immediate field of the BIC instruction only allows to
encode an immediate that can zero out up to a maximum of the 8 lower
bits. When a larger alignment is requested, a BIC instruction cannot
be used; llvm was silently producing incorrect code in this case.

This commit fixes code generation for large stack aligments by
using the BFC instruction instead, when the BFC instruction is
available.  When not, it uses 2 instructions: a right shift,
followed by a left shift to zero out the lower bits.

The lowering of ARM::Int_eh_sjlj_dispatchsetup still has code
that unconditionally uses BIC to realign the stack pointer, so it
very likely has the same problem. However, I wasn't able to
produce a test case for that. This commit adds an assert so that
the compiler will fail the assert instead of silently generating
wrong code if this is ever reached.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225446 91177308-0d34-0410-b5e6-96231b3b80d8
2015-01-08 15:09:14 +00:00
autoconf [multilib] Add support to the autoconf build to substitute 2014-12-29 11:58:17 +00:00
bindings [OCaml] [cmake] Use LLVM_LIBRARY_DIR instead of LLVM_LIBRARY_OUTPUT_INTDIR. 2014-12-30 03:24:07 +00:00
cmake Reverting r225319; since there is a folder named Examples, attempting to add a target of the same name causes problems for IDEs like Visual Studio. 2015-01-07 14:47:12 +00:00
docs [LangRef] PR22118: Hyphen is allowed in IR identifiers. 2015-01-07 21:35:14 +00:00
examples Manually specify the folder that Kaleidescope should reside in for CMake-produced solutions that care about such things (like MSVC). This takes the Kaleidescope target out of the root solution folder and places it into the Examples folder where it belongs. 2015-01-07 14:26:07 +00:00
include Move SPAdj logic from PEI into the targets (NFC) 2015-01-08 11:04:38 +00:00
lib Fix large stack alignment codegen for ARM and Thumb2 targets 2015-01-08 15:09:14 +00:00
projects [cmake] Use the external project machinery for libcxxabi so that it can 2014-07-25 10:27:40 +00:00
test Fix large stack alignment codegen for ARM and Thumb2 targets 2015-01-08 15:09:14 +00:00
tools Run clang-format on tools/llvm-objdump/MachODump.cpp again as some of my 2015-01-08 00:25:24 +00:00
unittests IR: Add MDNode::getDistinct() 2015-01-07 22:24:46 +00:00
utils [X86] Don't print 'dword ptr' or 'qword ptr' on the operand to some of the LEA variants in Intel syntax. The memory operand is inherently unsized. 2015-01-08 07:41:30 +00:00
.arcconfig Updated phabricator server. 2014-04-07 03:57:04 +00:00
.clang-format Test commit. 2014-03-02 13:08:46 +00:00
.clang-tidy Enable display of compiler diagnostics in clang-tidy by default. 2014-10-29 17:29:38 +00:00
.gitignore [git] Mark the llgo directory in the LLVM gitignore. 2015-01-07 21:08:54 +00:00
CMakeLists.txt [py3] Teach the CMake build to reject Python versions older than 2.7. 2014-12-29 19:36:05 +00:00
CODE_OWNERS.TXT Add myself as SystemZ code owner 2014-12-18 19:27:50 +00:00
configure [multilib] Add support to the autoconf build to substitute 2014-12-29 11:58:17 +00:00
CREDITS.TXT Rise from the dead and update personal info 2014-08-25 17:51:04 +00:00
LICENSE.TXT Remove projects/sample. 2014-03-12 22:40:22 +00:00
llvm.spec.in
LLVMBuild.txt Remove the very substantial, largely unmaintained legacy PGO 2013-10-02 15:42:23 +00:00
Makefile [configure/make] Propagate names of build host tools when making BuildTools 2014-03-25 21:45:41 +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 a check for misbehaving -Wcomment from gcc-4.7 and add 2014-11-05 00:35:15 +00:00
Makefile.rules Add a check for misbehaving -Wcomment from gcc-4.7 and add 2014-11-05 00:35:15 +00:00
README.txt Test commit. 2015-01-07 22:07:33 +00:00

README.txt 

Low Level Virtual Machine (LLVM)
================================

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Please see the documentation provided in docs/ for further
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If you're writing a package for LLVM, see docs/Packaging.rst for our
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