Bill Wendling 869d60d39d Machine sink could potentially sink instructions into a block where the physical ... registers it defines then interfere with an existing preg live range. For instance, if we had something like these machine instructions: BB#0 ... = imul ... EFLAGS<imp-def,dead> test ..., EFLAGS<imp-def> jcc BB#2 EFLAGS<imp-use> BB#1 ... ; fallthrough to BB#2 BB#2 ... ; No code that defines EFLAGS jcc ... EFLAGS<imp-use> Machine sink will come along, see that imul implicitly defines EFLAGS, but because it's "dead", it assumes that it can move imul into BB#2. But when it does, imul's "dead" imp-def of EFLAGS is raised from the dead (a zombie) and messes up the condition code for the jump (and pretty much anything else which relies upon it being correct). The solution is to know which pregs are live going into a basic block. However, that information isn't calculated at this point. Nor does the LiveVariables pass take into account non-allocatable physical registers. In lieu of this, we do a *very* conservative pass through the basic block to determine if a preg is live coming out of it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105387 91177308-0d34-0410-b5e6-96231b3b80d8		2010-06-03 07:54:20 +00:00
..
Analysis	Fix the noalias checking so that it doesn't worry about	2010-06-01 20:51:40 +00:00
Archive	Eliminate some unnessary Path::exists() calls.	2010-05-27 20:51:54 +00:00
AsmParser	Eliminate the restriction that the array size in an alloca must be i32.	2010-05-28 01:14:11 +00:00
Bitcode	Speedup bitcode writer. Do not walk all values for all functions to emit function local metadata. In one testcase, probably worst case scenario, the 70x speed up is seen.	2010-06-02 23:05:04 +00:00
CodeGen	Machine sink could potentially sink instructions into a block where the physical	2010-06-03 07:54:20 +00:00
CompilerDriver	Print a space after the colon.	2010-05-20 21:11:37 +00:00
ExecutionEngine	improve portability to systems that don't have powf/modf (e.g. solaris 9)	2010-05-15 17:10:24 +00:00
Linker	Add basic error checking to MemoryBuffer::getSTDIN.	2010-05-27 17:31:51 +00:00
MC	Don't call flush() at a library level which isn't checking for errors	2010-06-01 16:31:34 +00:00
Support	Minor code simplification.	2010-05-28 16:50:23 +00:00
System	Factor out the handler work from SignalHandler into a helper function,	2010-05-27 23:11:55 +00:00
Target	Add first pass at darwin tls compiler support.	2010-06-03 04:07:48 +00:00
Transforms	Remove unused code	2010-06-01 21:56:30 +00:00
VMCore	Split the logic behind CastInst::isNoopCast into a separate static function,	2010-05-28 21:41:37 +00:00
Makefile