llvm-svn: 31155

llvm-svn: 31154

llvm-svn: 31153

llvm-svn: 31152

llvm-svn: 31151

llvm-svn: 31150

a place more useful.  In particular, if we can put them in a place where code
will be able to fall into it, do so.  Otherwise, put it in a place it can fall
through into a successor.  Otherwise, if preventing a fallthrough, move to the
end of the function, out of the way.

This deletes several hundred unconditional branches from spass.

llvm-svn: 31149

llvm-svn: 31148

llvm-svn: 31147

passes llvm-gcc bootstrap.

llvm-svn: 31146

llvm-svn: 31145

llvm-svn: 31144

llvm-svn: 31143

llvm-svn: 31142

llvm-svn: 31140

llvm-svn: 31139

llvm-svn: 31138

llvm-svn: 31137

llvm-svn: 31136

llvm-svn: 31135

llvm-svn: 31134

llvm-svn: 31133

Prolangs-C/agrep and SCCP/2006-10-23-IPSCCP-Crash.ll

llvm-svn: 31132

llvm-svn: 31131

        movl 32(%esp), %eax
        cmpl $1, %eax
        je LBB1_1       #bb
LBB1_4: #entry
        cmpl $2, %eax
        je LBB1_2       #bb2
        jmp LBB1_3      #UnifiedReturnBlock
LBB1_1: #bb

notice that we would miss the fall through and emit this instead:

        movl 32(%esp), %eax
        cmpl $2, %eax
        je LBB1_2       #bb2
LBB1_4: #entry
        cmpl $1, %eax
        jne LBB1_3      #UnifiedReturnBlock
LBB1_1: #bb

llvm-svn: 31130

llvm-svn: 31129

llvm-svn: 31128

llvm-svn: 31127

property is added by running through the list of uses of the value and
adding resolved properties to the property set.

llvm-svn: 31126

llvm-svn: 31125

llvm-svn: 31124

llvm-svn: 31123

llvm-svn: 31122

llvm-svn: 31121

This will allow (after llvm-gcc linkage fix) more dummy tests using
libstdc++ to pass on mingw :)

llvm-svn: 31120

llvm-svn: 31119

optimization opportunity pointed out by Chris Lattner.

llvm-svn: 31118

llvm-svn: 31117

opportunity pointed out by Andrew Lewycky.

llvm-svn: 31115

transformation.  This speeds up a C++ app 2.25x.

llvm-svn: 31113