Preston Gurd 6a8c7bf8e7 This patch fixes a problem which arose when using the Post-RA scheduler ... on X86 Atom. Some of our tests failed because the tail merging part of the BranchFolding pass was creating new basic blocks which did not contain live-in information. When the anti-dependency code in the Post-RA scheduler ran, it would sometimes rename the register containing the function return value because the fact that the return value was live-in to the subsequent block had been lost. To fix this, it is necessary to run the RegisterScavenging code in the BranchFolding pass. This patch makes sure that the register scavenging code is invoked in the X86 subtarget only when post-RA scheduling is being done. Post RA scheduling in the X86 subtarget is only done for Atom. This patch adds a new function to the TargetRegisterClass to control whether or not live-ins should be preserved during branch folding. This is necessary in order for the anti-dependency optimizations done during the PostRASchedulerList pass to work properly when doing Post-RA scheduling for the X86 in general and for the Intel Atom in particular. The patch adds and invokes the new function trackLivenessAfterRegAlloc() instead of using the existing requiresRegisterScavenging(). It changes BranchFolding.cpp to call trackLivenessAfterRegAlloc() instead of requiresRegisterScavenging(). It changes the all the targets that implemented requiresRegisterScavenging() to also implement trackLivenessAfterRegAlloc(). It adds an assertion in the Post RA scheduler to make sure that post RA liveness information is available when it is needed. It changes the X86 break-anti-dependencies test to use –mcpu=atom, in order to avoid running into the added assertion. Finally, this patch restores the use of anti-dependency checking (which was turned off temporarily for the 3.1 release) for Intel Atom in the Post RA scheduler. Patch by Andy Zhang! Thanks to Jakob and Anton for their reviews. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155395 91177308-0d34-0410-b5e6-96231b3b80d8		2012-04-23 21:39:35 +00:00
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Analysis	Allow forward declarations to take a context. This helps the debugger	2012-04-23 19:00:11 +00:00
Archive	Include cstdio in a few place that depended on getting it transitively through StringExtras.h	2012-03-23 11:35:30 +00:00
AsmParser	Convert assert(0) to llvm_unreachable	2012-02-07 05:05:23 +00:00
Bitcode	llvm::SwitchInst	2012-03-11 06:09:17 +00:00
CodeGen	This patch fixes a problem which arose when using the Post-RA scheduler	2012-04-23 21:39:35 +00:00
DebugInfo	Fix a C++11 UDL conflict.	2012-04-04 20:33:56 +00:00
ExecutionEngine	Fix incorrect call of resolveRelocation() for ARM ELF stub relocations.	2012-04-17 20:10:16 +00:00
Linker	Add a flag to the struct type finder to collect only those types which have	2012-04-21 23:59:16 +00:00
MC	MC assembly parser handling for trailing comma in macro instantiation.	2012-04-16 21:18:49 +00:00
Object	Implement GDB integration for source level debugging of code JITed using	2012-04-16 22:12:58 +00:00
Support	[Support/Unix] Unconditionally include time.h.	2012-04-23 19:00:27 +00:00
TableGen	Fix copy/paste-o.	2012-04-18 18:09:53 +00:00
Target	This patch fixes a problem which arose when using the Post-RA scheduler	2012-04-23 21:39:35 +00:00
Transforms	Reapply r155136 after fixing PR12599.	2012-04-23 17:39:52 +00:00
VMCore	Cleanup whitespace.	2012-04-23 00:23:33 +00:00
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LLVMBuild.txt
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