llvm-svn: 98124

llvm-svn: 98122

1. Be careful with cse "cheap" expressions. e.g. constant materialization. Only cse them when the common expression is local or in a direct predecessor. We don't want cse of cheap instruction causing other expressions to be spilled.
2. Watch out for the case where the expression doesn't itself uses a virtual register. e.g. lea of frame object. If the common expression itself is used by copies (common for passing addresses to function calls), don't perform the cse. Since these expressions do not use a register, it creates a live range but doesn't close any, we want to be very careful with increasing register pressure.

Note these are heuristics so machine cse doesn't make register allocator unhappy. Once we have proper live range splitting and re-materialization support in place, these should be evaluated again.

Now machine cse is almost always a win on llvm nightly tests on x86 and x86_64.

llvm-svn: 98121

llvm-svn: 98120

Add a new GetOrCreateTemporarySymbol method and a version that
takes a twine.

llvm-svn: 98118

dead IsPCRel argument.

llvm-svn: 98117

need to be MCized, but the last debug info thing are LEB and
cygwin specific (which the MC api doesn't support yet) and
one specific form of EmitReference which I'll tackle next.

llvm-svn: 98116

 - I'm not sure why, but this is what 'as' does.

llvm-svn: 98115

llvm-svn: 98109

llvm-svn: 98108

llvm-svn: 98107

llvm-svn: 98106

method.  With this, comments should end up on the same lines as the .byte
directives (for example) and we now get no output with:

$ llc CodeGen/X86/2009-02-12-DebugInfoVLA.ll -o - -filetype=null -asm-verbose

woot.

llvm-svn: 98105

llvm-svn: 98104

They are lots of trouble, and they don't matter. This fixes PR6559.

llvm-svn: 98103

off "EOL".

llvm-svn: 98102

significant debug info testcases are now all going through
MCStreamer, though they print a lot of extraneous newlines to "O".

llvm-svn: 98101

llvm-svn: 98100

The Caller cost info would be reset everytime a callee was inlined. If the
caller has lots of calls and there is some mutual recursion going on, the
caller cost info could be calculated many times.

This patch reduces inliner runtime from 240s to 0.5s for a function with 20000
small function calls.

This is a more conservative version of r98089 that doesn't break the clang
test CodeGenCXX/temp-order.cpp. That test relies on rather extreme inlining
for constant folding.

llvm-svn: 98099

MC/X86: Rename alternate spellings of ADD{8,16,32} and mark as "code gen only" so they don't get selected by the asm matcher.

llvm-svn: 98098

MC/X86: Rename alternate spellings of CMP{8,16,32} and mark as "code gen only" so they don't get selected by the asm matcher.

llvm-svn: 98097

llvm-svn: 98094

The Caller cost info would be reset everytime a callee was inlined. If the
caller has lots of calls and there is some mutual recursion going on, the
caller cost info could be calculated many times.

This patch reduces inliner runtime from 240s to 0.5s for a function with 20000
small function calls.

llvm-svn: 98089

can sometimes help reduce function size.

llvm-svn: 98088

is preparatory to having PEI's scavenged frame index value reuse logic
properly distinguish types of frame values (e.g., whether the value is
stack-pointer relative or frame-pointer relative).

No functionality change.

llvm-svn: 98086

what fields of the CPSR or SPSR are affected.

llvm-svn: 98085

MC/Mach-O: For PCrel relocations, we need to compensate for the PCrel adjustment when determining if we need a scattered relocation.

llvm-svn: 98082

llvm-svn: 98081

llvm-svn: 98080

Make it so.  (This patch is in LowerCall_Darwin, which seems
to be used by SVR4 code as well; since that doesn't belong here,
I haven't worried about this case.)

llvm-svn: 98077

register is involved for thumb1. Work around this for the moment by only
re-using SP-relative offsets. This is temporary 'til the code can distinguish
multiple base registers.

llvm-svn: 98071

Place the LSDA into the TEXT section for ARM platforms. This involves making the
encoding indirect, pcrel, and sdata4 instead of an absolute pointer. The
references to the type infos are then non-lazy pointers. Revision 98019 changed
the encoding of non-lazy pointers to add the symbol to the non-lazy pointer
definition if it's a local symbol (otherwise, it's external and set to '0' so
that the loader can adjust it to the real value). This paved the way for this
change to work on ARM.

llvm-svn: 98068

to an add or a sub.

llvm-svn: 98059

llvm-svn: 98058

llvm-svn: 98057

llvm-svn: 98048

Now that setStartLabel takes an MCSymbol, we can de-ID'ize
beginScope and RecordSourceLine.

llvm-svn: 98047

failure remaining on mainline.

llvm-svn: 98046

llvm-svn: 98045

llvm-svn: 98044