llvm-svn: 40030

llvm-svn: 40028

llvm-svn: 40025

This fixes PR1559.

llvm-svn: 40024

llvm-svn: 40022

Use MOV instead of LEA to restore ESP if callee-saved frame size is 0; if previous instruction updates esp, fold it in.

llvm-svn: 40018

end of a BasicBlock and have an alignment parameter.

llvm-svn: 40016

and stores that have a specified alignment of less than 16 bytes now use
instructions that support misaligned memory references.

llvm-svn: 40015

would result in calling realloc() on a null pointer.  Instead, if we encounter
this situation, make a normal call to malloc().

llvm-svn: 40014

alignment is equal to the stack alignment.

llvm-svn: 40004

llvm-svn: 39998

llvm-svn: 39984

llvm-svn: 39979

llvm-svn: 39978

llvm-svn: 39977

Missed the case where alloca is used but the stack size (not including callee-saved portion) is zero. Thanks Dan.

llvm-svn: 39974

llvm-svn: 39971

llvm-svn: 39967

llvm-svn: 39962

having that implementation file #include <cstdlib>.

llvm-svn: 39952

beyond the end of an alloca to make FastDSE faster and more aggressive.

llvm-svn: 39945

dead stores on 400.perlbench.

llvm-svn: 39929

llvm-svn: 39926

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

llvm-svn: 39921

llvm-svn: 39896

llvm-svn: 39894

Always pass the constant as the second parameter to HowManyLessThans.

Remove obsolete "isSigned" parameter.

llvm-svn: 39893

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: 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