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

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: 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: 30281

llvm-svn: 30279

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

llvm-svn: 30278

llvm-svn: 30277

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

llvm-svn: 30275

llvm-svn: 30271

llvm-svn: 30269

llvm-svn: 30268

llvm-svn: 30266

llvm-svn: 30262

llvm-svn: 30261

llvm-svn: 30252

llvm-svn: 30251

llvm-svn: 30246

llvm-svn: 30245

llvm-svn: 30244

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

llvm-svn: 30241

llvm-svn: 30240

llvm-svn: 30239

bit.  This fixes Regression/Transforms/TailDup/MergeTest.ll

llvm-svn: 30237

due to switch cases going to the same place, it make #pred != #phi entries,
breaking live interval analysis.

This fixes 458.sjeng on x86 with llc.

llvm-svn: 30236

operations (like findProperties) should be faster, at the expense of
unionSets being slower in cases that are rare in practise.

Don't erase a dead Instruction. This fixes a memory corruption issue.

llvm-svn: 30235

llvm-svn: 30234

llvm-svn: 30231

This implements select.ll::test18.

llvm-svn: 30230

llvm-svn: 30226

llvm-svn: 30225

llvm-svn: 30217

the file now, however the relocated address is currently wrong.  Fixing
that will require some deep pondering.

llvm-svn: 30207

in addition to immediate operands.

llvm-svn: 30205

safe for later allocation.  This fixes McCat/18-imp with llc-beta.

llvm-svn: 30204

llvm-svn: 30198

of unallocatable registers, just because an alias is allocatable.  We were
picking registers like SIL just because ESI was being used.

llvm-svn: 30197

llvm-svn: 30191