finish without combining something it is capable of.

llvm-svn: 34865

llvm-svn: 34863

llvm-svn: 34862

Replace expensive getZExtValue() == 0 calls with isZero() calls.

llvm-svn: 34861

llvm-svn: 34860

llvm-svn: 34859

llvm-svn: 34858

llvm-svn: 34857

llvm-svn: 34856

2. Make sure debug output of APInt values is safe for all bit widths.

llvm-svn: 34855

llvm-svn: 34854

llvm-svn: 34853

llvm-svn: 34852

llvm-svn: 34850

llvm-svn: 34849

a value from the worklist required scanning the entire worklist to remove all
entries.  We now use a combination map+vector to prevent duplicates from
happening and prevent the scan.  This speeds up instcombine on a large file
from the llvm-gcc bootstrap from 189.7s to 4.84s in a debug build and from
5.04s to 1.37s in a release build.

llvm-svn: 34848

llvm-svn: 34846

llvm-svn: 34845

llvm-svn: 34844

llvm-svn: 34843

llvm-svn: 34842

- Available value use may be deleted (e.g. noop move).

llvm-svn: 34841

llvm-svn: 34840

llvm-svn: 34839

passed in registers, not directly from the pregs themselves.

llvm-svn: 34838

llvm-svn: 34837

llvm-svn: 34836

this to a NOTE: because pari/gp results start to get rounded incorrectly
after 192 bits of precision. APInt and pari/gp never differ by more than
1, but APInt is more accurate because it does not lose precision after 192
bits as does pari/gp.

llvm-svn: 34834

llvm-svn: 34833

llvm-svn: 34832

llvm-svn: 34831

llvm-svn: 34830

llvm-svn: 34829

llvm-svn: 34828

llvm-svn: 34826

but not on X86 becuase shift by word size is "undefined".

llvm-svn: 34825

llvm-svn: 34824

llvm-svn: 34822

Constant::isNullValue() in situations where it is possible.

llvm-svn: 34821

These will be used in upcoming patches to avoid virtual function call when
the client knows it is a ConstantInt.

llvm-svn: 34820