llvm-svn: 112104

expanding: e.g. <2 x float> -> <4 x float> instead of -> 2 floats.  This
affects two places in the code: handling cross block values and handling
function return and arguments.  Since vectors are already widened by 
legalizetypes, this gives us much better code and unblocks x86-64 abi
and SPU abi work.

For example, this (which is a silly example of a cross-block value):
define <4 x float> @test2(<4 x float> %A) nounwind {
 %B = shufflevector <4 x float> %A, <4 x float> undef, <2 x i32> <i32 0, i32 1>
 %C = fadd <2 x float> %B, %B
  br label %BB
BB:
 %D = fadd <2 x float> %C, %C
 %E = shufflevector <2 x float> %D, <2 x float> undef, <4 x i32> <i32 0, i32 1, i32 undef, i32 undef>
 ret <4 x float> %E
}

Now compiles into:

_test2:                                 ## @test2
## BB#0:
 addps %xmm0, %xmm0
 addps %xmm0, %xmm0
 ret

previously it compiled into:

_test2:                                 ## @test2
## BB#0:
 addps %xmm0, %xmm0
 pshufd $1, %xmm0, %xmm1
                                        ## kill: XMM0<def> XMM0<kill> XMM0<def>
 insertps $0, %xmm0, %xmm0
 insertps $16, %xmm1, %xmm0
 addps %xmm0, %xmm0
 ret

This implements rdar://8230384

llvm-svn: 112101

llvm-svn: 112099

instructions, not when remapping modules.

llvm-svn: 112091

llvm-svn: 112090

llvm-svn: 112089

llvm-svn: 112086

llvm-svn: 112085

llvm-svn: 112084

llvm-svn: 112083

from MDValueList between each function, now that the bitcode
writer is reusing the index space for function-local metadata.

llvm-svn: 112082

llvm-svn: 112081

llvm-svn: 112080

llvm-svn: 112079

Patch by Adam Treat!

llvm-svn: 112077

llvm-svn: 112076

When doing copy/paste/modify, it's apparently rather important to remember
the 'modify' bit...

llvm-svn: 112075

llvm-svn: 112073

DIGlobalVariable can be used to encode debug info for  globals that are directly folded into a constant by FE.

llvm-svn: 112072

llvm-svn: 112069

llvm-svn: 112068

llvm-svn: 112060

function-specific state.

llvm-svn: 112058

llvm-svn: 112056

llvm-svn: 112055

comparison that would overflow.
 - The other under/overflow cases can't actually happen because the immediates
   which would trigger them are legal (so we don't enter this code), but
   adjusted the style to make it clear the transform is always valid.

llvm-svn: 112053

llvm-svn: 112042

Fixes PR7967.

Owen: You added these, any reason?
llvm-svn: 112041

llvm-svn: 112039

llvm-svn: 112036

llvm-svn: 112035

Mark _alloca call as clobberring EFLAGS, otherwise some DCE might remove
other flags-clobberring stuff (e.g. cmp instructions) occuring after
_alloca call.

llvm-svn: 112034

llvm-svn: 112033

Fix some todos.  No functional change.

llvm-svn: 112031

Untested.

llvm-svn: 112029

ARM instructions with:

foo GPR, rGPR

which happens a lot.

llvm-svn: 112025

llvm-svn: 112022

llvm-svn: 112020

teach lowering to get target specific nodes for pshufd, emulating the same isel behavior for now, so we can pass all vector shuffle tests

llvm-svn: 112017

llvm-svn: 112016