Chris Lattner 4e998b2fea Fold binary expressions and casts into PHI nodes that have all constant inputs. ...

This takes something like this:

%A = phi int [ 3, %cond_false.0 ], [ 2, %endif.0.i ], [ 2, %endif.1.i ]
%B = div int %tmp.243, 4

and turns it into:

%A = phi int [ 3/4, %cond_false.0 ], [ 2/4, %endif.0.i ], [ 2/4, %endif.1.i ]

which is later simplified (in this case) into %A = 0.

This triggers thousands of times in spec, for example, 269 times in 176.gcc.

This is tested by InstCombine/add.ll:test23 and set.ll:test18.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16582 91177308-0d34-0410-b5e6-96231b3b80d8

2004-09-29 05:07:12 +00:00

..

Analysis

'Pass' should now not be derived from by clients. Instead, they should derive

2004-09-20 04:48:05 +00:00

Archive

Changes For Bug 352

2004-09-01 22:55:40 +00:00

AsmParser

Okay, the list of link-time passes wasn't such a hot idea. Its prone to

2004-09-14 05:43:23 +00:00

Bytecode

Fix doxygen comment

2004-09-28 16:57:46 +00:00

CodeGen

Add includes and use std:: for standard library calls to make code

2004-09-28 14:42:44 +00:00

Debugger

Changes For Bug 352

2004-09-01 22:55:40 +00:00

ExecutionEngine

Convert code to compile with vc7.1.

2004-09-15 17:06:42 +00:00

Linker

Implement support for dependent libraries. The "source" module's dependent

2004-09-11 04:25:17 +00:00

Support

Add includes and use std:: for standard library calls to make code

2004-09-28 14:42:44 +00:00

System

Improve validity checking of windows path names and fix file creation

2004-09-29 00:01:17 +00:00

Target

Generate better code by being far less clever when it comes to the select instruction. Don't create overlapping register lifetimes

2004-09-29 05:00:31 +00:00

Transforms

Fold binary expressions and casts into PHI nodes that have all constant inputs.

2004-09-29 05:07:12 +00:00

VMCore

'Pass' should now not be derived from by clients. Instead, they should derive

2004-09-20 04:48:05 +00:00

Makefile

Wrap long line

2004-09-15 01:34:42 +00:00