in a specific BB, don't undo this!).  This allows us to compile
CodeGen/X86/loop-hoist.ll into:

_foo:
        xorl %eax, %eax
***     movl L_Arr$non_lazy_ptr, %ecx
        movl 4(%esp), %edx
LBB1_1: #cond_true
        movl %eax, (%ecx,%eax,4)
        incl %eax
        cmpl %edx, %eax
        jne LBB1_1      #cond_true
LBB1_2: #return
        ret

instead of:

_foo:
        xorl %eax, %eax
        movl 4(%esp), %ecx
LBB1_1: #cond_true
***     movl L_Arr$non_lazy_ptr, %edx
        movl %eax, (%edx,%eax,4)
        incl %eax
        cmpl %ecx, %eax
        jne LBB1_1      #cond_true
LBB1_2: #return
        ret

This was noticed in 464.h264ref.  This doesn't usually affect PPC,
but strikes X86 all the time.

llvm-svn: 30290

llvm-svn: 30289

We now compile CodeGen/X86/lea-2.ll into:

_test:
        movl 4(%esp), %eax
        movl 8(%esp), %ecx
        leal -5(%ecx,%eax,4), %eax
        ret

instead of:

_test:
        movl 4(%esp), %eax
        leal (,%eax,4), %eax
        addl 8(%esp), %eax
        addl $4294967291, %eax
        ret

llvm-svn: 30288

llvm-svn: 30287

llvm-svn: 30286

llvm-svn: 30285

        addl %ecx, %ecx
        adcl %eax, %eax

instead of:

        movl %ecx, %edx
        addl %edx, %edx
        shrl $31, %ecx
        addl %eax, %eax
        orl %ecx, %eax

and to:

        addc r5, r5, r5
        adde r4, r4, r4

instead of:

        slwi r2,r9,1
        srwi r0,r11,31
        slwi r3,r11,1
        or r2,r0,r2

on PPC.

llvm-svn: 30284

This implements CodeGen/X86/jump_sign.ll.

llvm-svn: 30283

llvm-svn: 30282

llvm-svn: 30281

llvm-svn: 30279

representing expressions that can only be resolved at link time, etc.

llvm-svn: 30278

llvm-svn: 30277

llvm-svn: 30276

Handle this.  This fixes PR908 and Transforms/LICM/2006-09-12-DeadUserOfSunkInstr.ll

llvm-svn: 30275

llvm-svn: 30274

llvm-svn: 30273

llvm-svn: 30271

is being removed.

llvm-svn: 30270

llvm-svn: 30269

llvm-svn: 30268

llvm-svn: 30267

llvm-svn: 30266

llvm-svn: 30265

llvm-svn: 30262

llvm-svn: 30261

llvm-svn: 30253

llvm-svn: 30252

llvm-svn: 30251

llvm-svn: 30248

llvm-svn: 30247

llvm-svn: 30246

llvm-svn: 30245

llvm-svn: 30244

llvm-svn: 30243

   the branch's chain is also produced by cmp.
          [ch, r : ld]
             ^ ^
             | |
      [XX]--/   \- [flag : cmp]
       ^             ^
       |             |
       \---[br flag]-

Remove an isel check which prevents loads from being folded into cmp / test
instructions.

2) Whenever possible, delete a selected node to allow more load folding
opportunities. Note not all nodes can be deleted after it has been
selected. Some may have simply morphed; some have not changed at all (e.g.
EntryToken).

llvm-svn: 30242

operand of a conditional branch to allow load folding into CMP / TEST
instructions.

llvm-svn: 30241

llvm-svn: 30240

llvm-svn: 30239

add a testcase for this commit: http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20050606/026673.html

llvm-svn: 30238