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6e7ba45460
llvm-6502/lib
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Chris Lattner 6e7ba45460 This is a bulk commit that implements the following primary improvements: 
* We can now fold cast instructions into select instructions that
    have at least one constant operand.
  * We now optimize expressions more aggressively based on bits that are
    known to be zero.  These optimizations occur a lot in code that uses
    bitfields even in simple ways.
  * We now turn more cast-cast sequences into AND instructions.  Before we
    would only do this if it if all types were unsigned.  Now only the
    middle type needs to be unsigned (guaranteeing a zero extend).
  * We transform sign extensions into zero extensions in several cases.

This corresponds to these test/Regression/Transforms/InstCombine testcases:
  2004-11-22-Missed-and-fold.ll
  and.ll: test28-29
  cast.ll: test21-24
  and-or-and.ll
  cast-cast-to-and.ll
  zeroext-and-reduce.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19220 91177308-0d34-0410-b5e6-96231b3b80d8
2005-01-01 16:22:27 +00:00
..
Analysis Wrap at 80 cols 2004-12-23 21:17:41 +00:00
Archive Remove potential platform portability issue with size of "int". 2004-12-29 01:20:24 +00:00
AsmParser Do not allow empty label names. 2004-12-10 05:40:19 +00:00
Bytecode Remove potential platform portability issue with size of "int". 2004-12-29 01:20:24 +00:00
CodeGen Move virtual method call out of loop 2004-12-15 07:04:32 +00:00
Debugger Correct the comments and file header. 2004-12-23 21:16:46 +00:00
ExecutionEngine Be double sure about including sys/stat.h by wrapping the inclusion in 2004-12-20 06:34:02 +00:00
Linker Remove un-needed #includes. 2004-12-20 04:15:44 +00:00
Support Fix a bug that made the nightly tester *really* slow. During changes for 2004-12-27 08:03:04 +00:00
System Where do these tabs keep coming from??? 2004-12-31 19:03:31 +00:00
Target Fix a FIXME: Select instructions on longs were miscompiled. 2005-01-01 16:10:12 +00:00
Transforms This is a bulk commit that implements the following primary improvements: 2005-01-01 16:22:27 +00:00
VMCore Allow getZeroExtend and getSignExtend to work with boolean inputs. 2005-01-01 15:59:57 +00:00
Makefile Add the Linker library 2004-11-14 21:54:41 +00:00