-enable-smarter-addr-folding to llc) that gives CGP a better
cost model for when to sink computations into addressing modes.
The basic observation is that sinking increases register 
pressure when part of the addr computation has to be available
for other reasons, such as having a use that is a non-memory
operation.  In cases where it works, it can substantially reduce
register pressure.

This code is currently an overall win on 403.gcc and 255.vortex
(the two things I've been looking at), but there are several 
things I want to do before enabling it by default:

1. This isn't doing any caching of results, so it is much slower 
   than it could be.  It currently slows down release-asserts llc 
   by 1.7% on 176.gcc: 27.12s -> 27.60s.
2. This doesn't think about inline asm memory operands yet.
3. The cost model botches the case when the needed value is live
   across the computation for other reasons.

I'll continue poking at this, and eventually turn it on as llcbeta.

llvm-svn: 60074

Revert r60042. IndVarSimplify should check if APFloat is PPCDoubleDouble first before trying to convert it to an integer.

llvm-svn: 60072

llvm-svn: 60071

Add setter method PreprocessorLexer::setParsingPreprocessorDirective().  This will be used by the mechanism to generate cached tokens.

llvm-svn: 60070

llvm-svn: 60069

optimize addressing modes.  This allows us to optimize things like isel-sink2.ll
into:

	movl	4(%esp), %eax
	cmpb	$0, 4(%eax)
	jne	LBB1_2	## F
LBB1_1:	## TB
	movl	$4, %eax
	ret
LBB1_2:	## F
	movzbl	7(%eax), %eax
	ret

instead of:

_test:
	movl	4(%esp), %eax
	cmpb	$0, 4(%eax)
	leal	4(%eax), %eax
	jne	LBB1_2	## F
LBB1_1:	## TB
	movl	$4, %eax
	ret
LBB1_2:	## F
	movzbl	3(%eax), %eax
	ret

This shrinks (e.g.) 403.gcc from 1133510 to 1128345 lines of .s.

Note that the 2008-10-16-SpillerBug.ll testcase is dubious at best, I doubt
it is really testing what it thinks it is.

llvm-svn: 60068

llvm-svn: 60067

llvm-svn: 60066

llvm-svn: 60065

change AnnotationManager to use 'const char*' instead of std::string. this fixes the leakage of those strings and avoids the creation of such strings in static cosntructors (should result in a little improvement of startup time)

llvm-svn: 60064

 - This improves -parse-noop of Carbon.h by +2%, and I believe
   compensates for the majority of the performance regression in r58913.

llvm-svn: 60063

llvm-svn: 60058

Use RAII objects to ensure proper destruction of expression and statement AST nodes in the parser in most cases, even on error.

llvm-svn: 60057

llvm-svn: 60054

llvm-svn: 60052

llvm-svn: 60051

llvm-svn: 60050

llvm-svn: 60049

llvm-svn: 60048

llvm-svn: 60047

llvm-svn: 60046

llvm-svn: 60045

llvm-svn: 60044

llvm-svn: 60043

convertToSignExtendedInteger should return opInvalidOp instead of asserting if sematics of float does not allow arithmetics.

llvm-svn: 60042

llvm-svn: 60041

llvm-svn: 60039

a writable property in one of its category.

llvm-svn: 60035

(a) Remove conditionally removed code in SelectXAddr. Basically, hope for the
    best that the A-form and D-form address predicates catch everything before
    the code decides to emit a X-form address.
(b) Expand vector store test cases to include the usual suspects.

llvm-svn: 60034

llvm-svn: 60033

llvm-svn: 60032

llvm-svn: 60030

llvm-svn: 60029

llvm-svn: 60018

llvm-svn: 60016

llvm-svn: 60015

if the operands have the same sign and the sum has sign opposite to that of the
operands."

llvm-svn: 60014

can recursively match things) and scales by 0 by ignoring them.
This triggers once in 403.gcc, saving 1 (!!!!) instruction in the 
whole huge app.

llvm-svn: 60013

into a new AddressingModeMatcher class.  This makes it easier
to reason about and reduces passing around of stuff, but has
no functionality change.

llvm-svn: 60012

new FindMaximalLegalAddressingModeForOperation helper method.

llvm-svn: 60011