llvm-svn: 46104

It's not safe to use the two value CombineTo variant to combine away a dead load.
e.g. 
v1, chain2 = load chain1, loc
v2, chain3 = load chain2, loc
v3         = add v2, c 
Now we replace use of v1 with undef, use of chain2 with chain1.
ReplaceAllUsesWith() will iterate through uses of the first load and update operands:
v1, chain2 = load chain1, loc
v2, chain3 = load chain1, loc
v3         = add v2, c 
Now the second load is the same as the first load, SelectionDAG cse will ensure
the use of second load is replaced with the first load.
v1, chain2 = load chain1, loc
v3         = add v1, c
Then v1 is replaced with undef and bad things happen.

llvm-svn: 46099

it should work, but I have no machine to test
it on.  Committed because it will at least
cause no harm, and maybe someone can test it
for me!

llvm-svn: 46098

llvm-svn: 46090

associated function is so marked.

llvm-svn: 46088

llvm-svn: 46073

simplification.  This fixes automotive-basicmath on PPC.

llvm-svn: 46072

pattern to use EmitStackConvert now.

llvm-svn: 46066

it to allow it to emit different load and store kinds.

llvm-svn: 46065

instead of inlining its body.

llvm-svn: 46062

into the ANY_EXTEND/ZERO_EXTEND/SIGN_EXTEND code to simplify it.

Unmerge the code for FP_ROUND and FP_EXTEND from each other to 
make each one simpler.

llvm-svn: 46061

llvm-svn: 46060

llvm-svn: 46058

some code.  No functionality change.

llvm-svn: 46055

make the 'fp return in ST(0)' optimization smart enough to
look through token factor nodes.  THis allows us to compile 
testcases like CodeGen/X86/fp-stack-retcopy.ll into:

_carg:
	subl	$12, %esp
	call	L_foo$stub
	fstpl	(%esp)
	fldl	(%esp)
	addl	$12, %esp
	ret

instead of:

_carg:
	subl	$28, %esp
	call	L_foo$stub
	fstpl	16(%esp)
	movsd	16(%esp), %xmm0
	movsd	%xmm0, 8(%esp)
	fldl	8(%esp)
	addl	$28, %esp
	ret

Still not optimal, but much better and this is a trivial patch.  Fixing 
the rest requires invasive surgery that is is not llvm 2.2 material.

llvm-svn: 46054

look through token factor

llvm-svn: 46053

llvm-svn: 46052

a public SDOperand::reachesChainWithoutSideEffects method.  No 
functionality change.

llvm-svn: 46050

llvm-svn: 46045

to the tree node.

llvm-svn: 46034

- Communicate symbol visibility
- Communicate code generation model

llvm-svn: 46033

llvm-svn: 46032

llvm-svn: 46030

ShortenEHDataFor64Bits as a not-very-accurate
abstraction to cover all the changes in DwarfWriter.
Some cosmetic changes to Darwin assembly code for
gcc testsuite compatibility.

llvm-svn: 46029

Move some calls to getVRegDef higher in the callgraph, so they don't get executed as frequently in performance sensitive code.

llvm-svn: 46027

llvm-svn: 46026

break the byval attr on some other argument.

llvm-svn: 46025

llvm-svn: 46024

llvm-svn: 46023

llvm-svn: 46021

llvm-svn: 46020

llvm-svn: 46019

it's a function pointer) not MVT::Other.  This fixes builtin_trap
lowering on ppc, alpha, ia64

llvm-svn: 46018

Move definition of 'trap' sdnode up from x86 instrinfo to targetselectiondag.td.

llvm-svn: 46017

llvm-svn: 46016

llvm-svn: 46015

llvm-svn: 46014

Add files to windows project files.  Also include <algorithm> explicitly so that vstudio build works

llvm-svn: 46013

llvm-svn: 46012

llvm-svn: 46009