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4e998b2fea
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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
autoconf Improve warning 2004-09-27 07:35:19 +00:00
docs * InstructionReader.cpp was absorbed into Reader.cpp 2004-09-28 16:58:12 +00:00
examples Correct the file header to reflect the new "examples" home for the file. 2004-09-11 20:30:11 +00:00
include/llvm Be consistent with our naming 2004-09-28 18:37:00 +00:00
lib Fold binary expressions and casts into PHI nodes that have all constant inputs. 2004-09-29 05:07:12 +00:00
projects Stacker compiler library doesn't need to be shared and it can cause 2004-09-15 06:22:54 +00:00
runtime Disable libprofile as it breaks the build on Sparc (autoconf issues). 2004-09-08 20:30:26 +00:00
test New testcases 2004-09-29 05:06:12 +00:00
tools Hrm, if there is an error loading a file, try printing a message so the 2004-09-27 16:41:01 +00:00
utils * Add `deplibs' keyword for specifying a list of dependent libraries 2004-09-28 21:46:18 +00:00
.cvsignore Ok, try #2, this time I'll not be stupid 2003-08-03 18:33:24 +00:00
configure Improve warning 2004-09-27 07:35:19 +00:00
CREDITS.TXT Update email address 2004-09-23 04:39:30 +00:00
LICENSE.TXT Adjust the license files based on the actual content of llvm and llvm-test 2004-09-16 16:41:31 +00:00
llvm.spec Updated for 1.3. 2004-08-16 15:17:40 +00:00
llvm.spec.in Updated for 1.3. 2004-08-16 15:17:40 +00:00
Makefile Changed the distclean target to handle the new location of config.h. 2004-09-17 15:08:25 +00:00
Makefile.common Standardize header comments of top-level Makefiles. 2004-04-24 00:10:56 +00:00
Makefile.config.in PAPI is not used here. 2004-09-07 17:34:34 +00:00
Makefile.rules Corrected spelling of Makefile variable, thereby re-enabling profile 2004-09-28 14:52:58 +00:00
README.txt Make the text of this file a little more useful. 2004-09-02 22:49:27 +00:00

README.txt 

Low Level Virtual Machine (LLVM)
================================

This directory and its subdirectories contain source code for the Low Level 
Virtual Machine, a toolkit for the construction of highly optimized compilers,
optimizers, and runtime environments. 

LLVM is open source software. You may freely distribute it under the terms of
the license agreement found in LICENSE.txt.

Please see the HTML documentation provided in docs/index.html for further
assistance with LLVM.