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bb5b3f3359
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Lang Hames bb5b3f3359 Add a natural stack alignment field to TargetData, and prevent InstCombine from 
promoting allocas to preferred alignments that exceed the natural
alignment. This avoids some potentially expensive dynamic stack realignments.

The natural stack alignment is set in target data strings via the "S<size>"
option. Size is in bits and must be a multiple of 8. The natural stack alignment
defaults to "unspecified" (represented by a zero value), and the "unspecified"
value does not prevent any alignment promotions. Target maintainers that care
about avoiding promotions should explicitly add the "S<size>" option to their
target data strings.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141599 91177308-0d34-0410-b5e6-96231b3b80d8
2011-10-10 23:42:08 +00:00
..
CommandGuide Remove mention of llvm-gcc and llvm-g++. -Ministry of Truth 2011-09-20 18:24:04 +00:00
HistoricalNotes Fix a ton of comment typos found by codespell. Patch by 2011-04-15 05:18:47 +00:00
img Revert r103213. It broke several sections of live website. 2010-05-07 00:28:04 +00:00
tutorial Tell people using the tutorial how to make it actually work. 2011-10-04 19:36:30 +00:00
AliasAnalysis.html Update documentation: -basicaa does chaining these days. 2011-05-24 22:01:32 +00:00
Atomics.html s/SequeuentiallyConsistent/SequentiallyConsistent/g 2011-09-11 15:50:05 +00:00
BitCodeFormat.html docs: Introduce cascading style <div> and <p> continued on <h[2-5]>. 2011-04-23 00:30:22 +00:00
BranchWeightMetadata.html Add documenation about "branch_weight" metadata and __builtin_expect instruction 2011-07-06 18:31:02 +00:00
Bugpoint.html Update docs: Bugpoint understands -O[123] 2011-08-30 18:26:11 +00:00
CFEBuildInstrs.html docs: Canonicalize URLs. 2011-04-09 02:13:37 +00:00
CMake.html Update the CMake documentation to the correct variables. 2011-09-04 23:24:13 +00:00
CodeGenerator.html X86 has asterisk-free inline asm support now. 2011-09-19 18:15:46 +00:00
CodingStandards.html apparently variable naming conventions never got added, document the 2011-08-12 19:49:16 +00:00
CommandLine.html docs: Introduce cascading style <div> and <p> continued on <h[2-5]>. 2011-04-23 00:30:22 +00:00
CompilerWriterInfo.html docs: Introduce cascading style <div> and <p> continued on <h[2-5]>. 2011-04-23 00:30:22 +00:00
DebuggingJITedCode.html docs: Introduce cascading style <div> and <p> continued on <h[2-5]>. 2011-04-23 00:30:22 +00:00
DeveloperPolicy.html Jakob is the code owner of register allocation and TableGen. 2011-10-07 17:26:38 +00:00
doxygen.cfg.in Revert r103213. It broke several sections of live website. 2010-05-07 00:28:04 +00:00
doxygen.css docs/doxygen.css: Tweak padding on memdoc. 2011-04-29 09:59:12 +00:00
doxygen.footer docs: Canonicalize URLs. 2011-04-09 02:13:37 +00:00
doxygen.header Revert r103213. It broke several sections of live website. 2010-05-07 00:28:04 +00:00
doxygen.intro Revert r103213. It broke several sections of live website. 2010-05-07 00:28:04 +00:00
ExceptionHandling.html Remove incorrect passage. 2011-09-27 20:16:57 +00:00
ExtendedIntegerResults.txt Revert r103213. It broke several sections of live website. 2010-05-07 00:28:04 +00:00
ExtendingLLVM.html The enum was moved to ISDOpcodes.h. 2011-06-30 06:37:07 +00:00
FAQ.html More llvmc bits. Spotted by Benjamin on IRC. 2011-09-20 00:42:28 +00:00
GarbageCollection.html docs: Update HTML markup(s). 2011-08-12 06:17:17 +00:00
GCCFEBuildInstrs.html docs: Introduce cascading style <div> and <p> continued on <h[2-5]>. 2011-04-23 00:30:22 +00:00
GetElementPtr.html docs: Introduce cascading style <div> and <p> continued on <h[2-5]>. 2011-04-23 00:30:22 +00:00
GettingStarted.html More llvmc bits. Spotted by Benjamin on IRC. 2011-09-20 00:42:28 +00:00
GettingStartedVS.html docs: Introduce cascading style <div> and <p> continued on <h[2-5]>. 2011-04-23 00:30:22 +00:00
GoldPlugin.html Remove mention of llvm-gcc/llvm-g++ from doc. 2011-09-18 12:37:20 +00:00
HowToReleaseLLVM.html docs: Introduce cascading style <div> and <p> continued on <h[2-5]>. 2011-04-23 00:30:22 +00:00
HowToSubmitABug.html Typo. 2011-06-07 20:03:13 +00:00
index.html More llvmc bits. Spotted by Benjamin on IRC. 2011-09-20 00:42:28 +00:00
LangRef.html Add a natural stack alignment field to TargetData, and prevent InstCombine from 2011-10-10 23:42:08 +00:00
Lexicon.html Add FCA to the lexicon. 2011-09-27 18:44:01 +00:00
LinkTimeOptimization.html Fix up the formating and change llvm-gcc to clang. 2011-09-18 12:51:05 +00:00
llvm.css docs/llvm.css: Introduce <blockquote><pre>. It may be used as blockquoted "doc_code". 2011-08-12 06:17:11 +00:00
Makefile Don't run ocamldoc if it's not installed 2011-02-09 18:32:04 +00:00
MakefileGuide.html docs: Introduce cascading style <div> and <p> continued on <h[2-5]>. 2011-04-23 00:30:22 +00:00
Packaging.html docs: Introduce cascading style <div> and <p> continued on <h[2-5]>. 2011-04-23 00:30:22 +00:00
Passes.html Remove the LowerSetJmp pass. It wasn't used effectively by any of the targets. 2011-08-03 22:18:20 +00:00
ProgrammersManual.html how about that, StringRef doesn't allow any mutation, thanks to 2011-07-23 17:18:57 +00:00
Projects.html Corrections and additional information for "Creating and LLVM Project" 2011-06-03 02:20:48 +00:00
re_format.7 Revert r103213. It broke several sections of live website. 2010-05-07 00:28:04 +00:00
ReleaseNotes.html some 3.0 API notes 2011-09-30 13:07:52 +00:00
SegmentedStacks.html Preliminary documentation in docs/SegmentedStacks.html. 2011-08-30 20:25:49 +00:00
SourceLevelDebugging.html Update docs to reflect recent addition of new CompileUnit elements. 2011-09-09 17:07:15 +00:00
SystemLibrary.html docs: Introduce cascading style <div> and <p> continued on <h[2-5]>. 2011-04-23 00:30:22 +00:00
TableGenFundamentals.html Remove Multidefs 2011-10-07 18:25:05 +00:00
TestingGuide.html Correct typos in TestingGuide.html 2011-05-18 18:07:16 +00:00
UsingLibraries.html docs: Introduce cascading style <div> and <p> continued on <h[2-5]>. 2011-04-23 00:30:22 +00:00
WritingAnLLVMBackend.html Use set operations instead of plain lists to enumerate register classes. 2011-06-15 23:28:14 +00:00
WritingAnLLVMPass.html docs: Introduce cascading style <div> and <p> continued on <h[2-5]>. 2011-04-23 00:30:22 +00:00