llvm-gcc build to succeed. Without this change it fails in libstdc++
compilation. This causes no regressions in dejagnu tests. However, 
someone who knows this code better might want to review it.

llvm-svn: 39924

have an error, and refector out the code for binary operators into
ConstantFoldBinaryFP and use it for all binary floating-point operations
which may have an error. These functions still rely exclusively on errno
to detect errors though.

llvm-svn: 39923

which appears to be the intent.

llvm-svn: 39922

llvm-svn: 39921

where it's interpreted as a comment, not part of the syntax.

llvm-svn: 39920

llvm-svn: 39917

llvm-svn: 39916

llvm-svn: 39915

of the cyclic depndency between llvm and llvm-gcc-4-0.

llvm-svn: 39910

llvm-svn: 39896

llvm-svn: 39895

llvm-svn: 39894

Always pass the constant as the second parameter to HowManyLessThans.

Remove obsolete "isSigned" parameter.

llvm-svn: 39893

llvm-svn: 39885

llvm-svn: 39882

First teach instcombine that sign bit checks only demand the 
sign bit, this allows simplify demanded bits to hack on 
expressions better.

Second, teach instcombine that ashr is useless if only the
sign bit is demanded.

llvm-svn: 39880

(X << 31) <s 0  --> (X&1) != 0

This happens dozens of times in the CFE.

llvm-svn: 39879

llvm-svn: 39857

llvm-svn: 39856

This patch fills the last necessary bits to enable exceptions
handling in LLVM. Currently only on x86-32/linux.

In fact, this patch adds necessary intrinsics (and their lowering) which
represent really weird target-specific gcc builtins used inside unwinder.

After corresponding llvm-gcc patch will land (easy) exceptions should be
more or less workable. However, exceptions handling support should not be 
thought as 'finished': I expect many small and not so small glitches
everywhere.

llvm-svn: 39855

llvm-svn: 39852

llvm-svn: 39851

llvm-svn: 39845

llvm-svn: 39844

llvm-svn: 39843

Handle GEPs with all-zero indices in the same way we handle pointer-pointer bitcasts. Also, fix a potentia infinite loop.

This brings FastDSE to parity with old DSE on 175.vpr.

llvm-svn: 39839

llvm-svn: 39834

llvm-svn: 39828

llvm-svn: 39827

llvm-svn: 39825

feedback. This theoretically makes the common (scalar) case more efficient.

llvm-svn: 39823

llvm-svn: 39822

This drastically improves the effect of FastDSE on kimwitu++.

llvm-svn: 39819

llvm-svn: 39817

Change name of -sched option and DEBUG_TYPE to
pre-RA-sched; adjust testcases.

llvm-svn: 39816

llvm-svn: 39813

llvm-svn: 39803

llvm-svn: 39802

* autoconf/AutoRegen.sh: use variables for autofoo versions
* autoconf/configure.ac: test for some more functions
                         that are not guaranteed on solaris

Note: the svn:mime-type of autoconf/AutoRegen.sh
      should be set to something that allows for
			text compares using svn diff
llvm-svn: 39800

llvm-svn: 39790