it just deletes empty MBB's.  Soon it will do more :)

llvm-svn: 30941

useful and general.

llvm-svn: 30940

llvm-svn: 30939

llvm-svn: 30938

llvm-svn: 30937

llvm-svn: 30936

llvm-svn: 30935

llvm-svn: 30934

llvm-svn: 30933

llvm-svn: 30932

being destroyed at inconvenient times.  Switch to using non-local ManagedStatic
objects, which actually also speeds up ConstRules::get.

llvm-svn: 30931

llvm-svn: 30930

llvm-svn: 30929

llvm-svn: 30928

llvm-svn: 30927

llvm-svn: 30926

llvm-svn: 30925

llvm-svn: 30924

llvm-svn: 30923

llvm-svn: 30922

llvm-svn: 30921

apply to rems as well as divs.  This fixes PR945 and speeds up ReedSolomon
from 14.57s to 10.90s (which is now faster than gcc).

It compiles CodeGen/X86/rem.ll into:

_test1:
        subl $4, %esp
        movl %esi, (%esp)
        movl $2155905153, %ecx
        movl 8(%esp), %esi
        movl %esi, %eax
        imull %ecx
        addl %esi, %edx
        movl %edx, %eax
        shrl $31, %eax
        sarl $7, %edx
        addl %eax, %edx
        imull $255, %edx, %eax
        subl %eax, %esi
        movl %esi, %eax
        movl (%esp), %esi
        addl $4, %esp
        ret
_test2:
        movl 4(%esp), %eax
        movl %eax, %ecx
        sarl $31, %ecx
        shrl $24, %ecx
        addl %eax, %ecx
        andl $4294967040, %ecx
        subl %ecx, %eax
        ret
_test3:
        subl $4, %esp
        movl %esi, (%esp)
        movl $2155905153, %ecx
        movl 8(%esp), %esi
        movl %esi, %eax
        mull %ecx
        shrl $7, %edx
        imull $255, %edx, %eax
        subl %eax, %esi
        movl %esi, %eax
        movl (%esp), %esi
        addl $4, %esp
        ret

instead of div/idiv instructions.

llvm-svn: 30920

llvm-svn: 30919

llvm-svn: 30918

llvm-svn: 30917

llvm-svn: 30916

llvm-svn: 30915

llvm-svn: 30914

llvm-svn: 30913

with ParseBytecodeFile used to leak both a ModuleProvider (and related
bytecode parser stuff attached to it) AND a file descriptor, which was
never closed.  This prevented gccld/llvm-ld/llvm-link from linking together
apps with more that ~252 .bc files on darwin.

llvm-svn: 30912

llvm-svn: 30911

llvm-svn: 30910

llvm-svn: 30909

llvm-svn: 30908

llvm-svn: 30907

http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20061009/038518.html

llvm-svn: 30906

that it can't assume ESP is unmodified across the instrs.

llvm-svn: 30905

llvm-svn: 30903

It's turning:
        movl -24(%ebp), %esp
        subl $16, %esp
        movl -24(%ebp), %ecx
into
        movl -24(%ebp), %esp
        subl $16, %esp
        movl %esp, (%esp)

llvm-svn: 30902

llvm-svn: 30900