Chris Lattner 4ece577019 Enhance the shift propagator to handle the case when you have: ...

A = shl x, 42
...
B = lshr ..., 38

which can be transformed into:
A = shl x, 4
...

iff we can prove that the would-be-shifted-in bits
are already zero.  This eliminates two shifts in the testcase
and allows eliminate of the whole i128 chain in the real example.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112314 91177308-0d34-0410-b5e6-96231b3b80d8

2010-08-27 22:53:44 +00:00

..

Hello

Reapply r110396, with fixes to appease the Linux buildbot gods.

2010-08-06 18:33:48 +00:00

InstCombine

Enhance the shift propagator to handle the case when you have:

2010-08-27 22:53:44 +00:00

Instrumentation

Reapply r110396, with fixes to appease the Linux buildbot gods.

2010-08-06 18:33:48 +00:00

IPO

Reapply r112091 and r111922, support for metadata linking, with a

2010-08-26 15:41:53 +00:00

Scalar

Fix typos in comments.

2010-08-27 20:32:56 +00:00

Utils

Reapply r112091 and r111922, support for metadata linking, with a

2010-08-26 15:41:53 +00:00

Makefile

Revert r100896 and around - this breaks the only mingw32 buildbot we have.

2010-04-15 19:51:42 +00:00