llvm-svn: 17286

and work better with VC++.  Patch contributed by Morten Ofstad!

llvm-svn: 17281

http://mail.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20041018/019708.html

exposed ANOTHER latent bug in this xform, which caused Prolangs-C/bison to fill
the zion nightly tester disk up and make the tester barf.

This is obviously not a good thing, so lets fix this bug shall we? :)

llvm-svn: 17276

llvm-svn: 17270

llvm-svn: 17218

llvm-svn: 17163

llvm-svn: 17161

llvm-svn: 17157

llvm-svn: 17155

llvm-svn: 17146

doing... I guess they're right.

llvm-svn: 17142

llvm-svn: 17136

loops.  This optimization is not turned on by default yet, but may be run
with the opt tool's -loop-reduce flag.  There are many FIXMEs listed in the
code that will make it far more applicable to a wide range of code, but you
have to start somewhere :)

This limited version currently triggers on the following tests in the
MultiSource directory:
pcompress2: 7 times
cfrac: 5 times
anagram: 2 times
ks: 6 times
yacr2: 2 times

llvm-svn: 17134

llvm-svn: 17125

Patch contributed by Morten Ofstad. Thanks Morten!

llvm-svn: 17123

Simplify code by simplifying terminators that branch to blocks that start
with an unreachable instruction.

llvm-svn: 17116

change hacks off 10K of bytecode from perlbmk (.5%) even though the front-end
is not generating them yet and we are not optimizing the resultant code.
This isn't too bad.

llvm-svn: 17111

llvm-svn: 17110

occurs in the entry node of a function

llvm-svn: 17109

particular, invoke ret values are only live in the normal dest of the invoke
not in the unwind dest.

llvm-svn: 17108

exercise that I'm not interested in tackling right now.  Just punt and treat them
like unwind's.

This 'fixes' test/Regression/Transforms/ADCE/unreachable-function.ll

llvm-svn: 17106

If a function had no return instruction in it, and the result of the inlined
call instruction was used, we would crash.

llvm-svn: 17104

other blocks.

llvm-svn: 17099

unneccesary.  This allows us to delete several hundred phi nodes of the
form PHI(x,x,x,undef) from 253.perlbmk and probably other programs as well.

This implements Mem2Reg/UndefValuesMerge.ll

llvm-svn: 17098

to think that PHI[4, undef] == 4.

llvm-svn: 17096

so prepare for this.

llvm-svn: 17095

llvm-svn: 17069

llvm-svn: 17067

ugly and giant constnat exprs in some programs.

llvm-svn: 17066

llvm-svn: 17056

llvm-svn: 17047

llvm-svn: 17046

llvm-svn: 17045

ignore unreachable instructions

llvm-svn: 17044

llvm-svn: 17043

that are initialized with undef.  When promoting malloc to a global, start out
initialized to undef

llvm-svn: 17042

weak functions.  Thanks for finding this John!

llvm-svn: 16997

nodes unless we KNOW that we are able to promote all of them.

This fixes: test/Regression/Transforms/SimplifyCFG/PhiNoEliminate.ll

llvm-svn: 16973

llvm-svn: 16950

llvm-svn: 16932