- If the defs of a spilled rematerializable MI are dead after the spill store is deleted, delete
  the def MI as well.

llvm-svn: 41086

llvm-svn: 41085

Fix for PR1596: AdjustCopiesBackFrom() should conservatively check if any of its sub-registers may overlap with the interval of the copy that's being coalesced.

llvm-svn: 41084

If a MI's def is remat as well as spilled, and the store is later deemed dead, mark the def operand as isDead.

llvm-svn: 41083

llvm-svn: 41082

they're not related to eliminating a load.

llvm-svn: 41081

llvm-svn: 41080

llvm-svn: 41078

the function.

llvm-svn: 41077

llvm-svn: 41075

llvm-svn: 41074

llvm-svn: 41073

using the count script instead of wc -l

llvm-svn: 41072

llvm-svn: 41070

no more uses within the MBB and the spilled value isn't live out of the MBB.
Then it's safe to delete the spill store.

llvm-svn: 41069

llvm-svn: 41068

spilled value is available for reuse.

llvm-svn: 41067

llvm-svn: 41064

llvm-svn: 41063

llvm-svn: 41062

llvm-svn: 41061

Re-implement trivial rematerialization. This allows def MIs whose live intervals that are coalesced to be rematerialized.

llvm-svn: 41060

llvm-svn: 41059

llvm-svn: 41054

llvm-svn: 41053

llvm-svn: 41052

llvm-svn: 41051

llvm-svn: 41050

see if the base register is already occupied before assuming it can be
used. This fixes bogus code generation in the accompanying testcase.

llvm-svn: 41049

llvm-svn: 41048

llvm-svn: 41047

Into: inttoptr (i64 0 to i8*)  -> null

This occurs in the example in PR1602.  With this fixed, we now compile
the example in PR1602 into fully "devirtualized" code:

define void @_Z1g1S(%struct.S* noalias  %s) {
entry:        %tmp131415 = getelementptr %struct.S* %s, i32 0, i32 0          ; <i32 (...)***> [#uses=1]        %tmp16 = load i32 (...)*** %tmp131415, align 4          ; <i32 (...)**> [#uses=1]
        %tmp26277 = load i32 (...)** %tmp16             ; <i32 (...)*> [#uses=1]
        %tmp2829 = bitcast i32 (...)* %tmp26277 to void (%struct.S*)*           ; <void (%struct.S*)*> [#uses=1]
        tail call void %tmp2829( %struct.S* %s )
        ret void
}

This still has the vtable dispatch (as required) but does not have any pointer
to method cruft left.

llvm-svn: 41046

llvm-svn: 41043

the list of link time passes to be run, just as for opt, with the
-debug-pass=Arguments option.

llvm-svn: 41040

llvm-svn: 41039

llvm-svn: 41034

better, gives the compiler a chance to validate the cast and reduces warnings
if the user turns on -Wold-style-cast option.

llvm-svn: 41033

llvm-svn: 41029

llvm-svn: 41028

llvm-svn: 41024