llvm-svn: 121853

llvm-svn: 121851

llvm-svn: 121850

llvm-svn: 121849

a wider mul if the wider mul is legal.

llvm-svn: 121848

result, the top bits are truncated off anyway, just use SRL.

llvm-svn: 121846

llvm-svn: 121838

llvm-svn: 121820

immediate versions.

llvm-svn: 121819

this case involve a select that simplifies to itself.

llvm-svn: 121817

llvm-svn: 121816

llvm-svn: 121815

llvm-svn: 121812

llvm-svn: 121809

particular, we want

   ldr r2, [r3]

to be equivalent to

   ldr r2, [r3, #0]

and not

   ldr r2, [r3, r0]

llvm-svn: 121808

llvm-svn: 121807

llvm-svn: 121806

llvm-svn: 121805

llvm-svn: 121801

llvm-svn: 121798

llvm-svn: 121797

is the addition of the FoldableAsLoad & Rematerializable flags to some of the
load instructions. ARM has these flags set for them.

llvm-svn: 121794

regB = move RCX
regA = op regB, regC
RAX  = move regA
where both regB and regC are killed. If regB is constrainted to non-compatible
physical registers but regC is not constrainted at all, then it's better to
commute the instruction.
       movl    %edi, %eax
       shlq    $32, %rcx
       leaq    (%rcx,%rax), %rax
=>
       movl    %edi, %eax
       shlq    $32, %rcx
       orq     %rcx, %rax
rdar://8762995

llvm-svn: 121793

llvm-svn: 121792

warning in the opt build.

llvm-svn: 121791

llvm-svn: 121790

llvm-svn: 121789

llvm-svn: 121788

llvm-svn: 121784

llvm-svn: 121783

LiveIntervalUnions.

llvm-svn: 121781

llvm-svn: 121780

set for interworking to work properly. rdar://8755956

llvm-svn: 121778

llvm-svn: 121774

llvm-svn: 121772

llvm-svn: 121769

llvm-svn: 121765

   which is simpler than finding a place to insert in BB.
 - Don't perform the 'if condition hoisting' xform on certain
   i1 PHIs, as it interferes with switch formation.

This re-fixes "example 7", without breaking the world hopefully.

llvm-svn: 121764

first, it can kick in on blocks whose conditions have been
folded to a constant, even though one of the edges will be
trivially folded.

second, it doesn't clean up the "if diamond" that it just 
eliminated away.  This is a problem because other simplifycfg
xforms kick in depending on the order of block visitation,
causing pointless work.

llvm-svn: 121762

breaking the selfhost builds, though I can't fathom how.

llvm-svn: 121761