the lo-reg first.  This is fallout from my ppc calling conv change yesterday,
it fixes test/ExecutionEngine/2003-05-06-LivenessClobber.llx

llvm-svn: 34983

llvm-svn: 34981

llvm-svn: 34965

Register scavenger is now capable of scavenging. It spills a register whose use of furthest away to make it available.

llvm-svn: 34964

enumeration.

llvm-svn: 34960

llvm-svn: 34917

llvm-svn: 34913

llvm-svn: 34910

addc, turn it into add.

This allows us to compile:

long long test(long long A, unsigned B) {
  return (A + ((long long)B << 32)) & 123;
}

into:

_test:
        movl $123, %eax
        andl 4(%esp), %eax
        xorl %edx, %edx
        ret

instead of:
_test:
        xorl %edx, %edx
        movl %edx, %eax
        addl 4(%esp), %eax   ;; add of zero
        andl $123, %eax
        ret

llvm-svn: 34909

llvm-svn: 34908

llvm-svn: 34903

llvm-svn: 34893

This "fixes" PR1238.

llvm-svn: 34890

llvm-svn: 34878

llvm-svn: 34875

entry (0x8b056f0, LLVM BB @0x8b01b30, ID#0):
Live Ins: %r0 %r1 %r2 %r3
        %reg1032 = tMOVrr %r3<kill>
        %reg1033 = tMOVri8 1
        %reg1034 = tMOVri8 0
        tCMPi8 %reg1029<kill>, 0
        tBcc mbb<entry,0x8b06a10>, 0
    Successors according to CFG: 0x8b06980 0x8b06a10

entry (0x8b06980, LLVM BB @0x8b01b30, ID#12):
    Predecessors according to CFG: 0x8b056f0
        %reg1036 = tMOVrr %reg1034<kill>
    Successors according to CFG: 0x8b06a10

entry (0x8b06a10, LLVM BB @0x8b01b30, ID#13):
    Predecessors according to CFG: 0x8b056f0 0x8b06980
        %reg1024<dead> = tMOVrr %reg1030<kill>
        ...

reg1030 and r1 have already been joined. When reg1024 and reg1030 are joined,
r1 live range from function entry to the tMOVrr instruction are dead. Eliminate
r1 from the livein set of the entry BB, not the BB where the copy is.

llvm-svn: 34866

llvm-svn: 34844

llvm-svn: 34843

- Available value use may be deleted (e.g. noop move).

llvm-svn: 34841

llvm-svn: 34839

llvm-svn: 34805

llvm-svn: 34804

llvm-svn: 34802

llvm-svn: 34786

llvm-svn: 34784

A restore is promoted to copy (or deleted entirely), remove the kill from the last use of the targetted register.

llvm-svn: 34773

llvm-svn: 34772

llvm-svn: 34770

llvm-svn: 34768

llvm-svn: 34767

llvm-svn: 34759

llvm-svn: 34752

llvm-svn: 34751

llvm-svn: 34750

llvm-svn: 34741

llvm-svn: 34740

llvm-svn: 34738

llvm-svn: 34736

llvm-svn: 34735

llvm-svn: 34711