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8 Commits

Author SHA1 Message Date
Benjamin Kramer ee40b9a2d4 CVP: If we have a PHI with an incoming select, try to skip the select. 
This is a common pattern with dyn_cast and similar constructs, when the
PHI no longer depends on the select it can often be turned into a simpler
construct or even get hoisted out of the loop.

PR15340.

llvm-svn: 175995
 2013-02-24 15:34:43 +00:00
Benjamin Kramer b867fea5e6 Fix invalid IR in test, missing incoming value for PHI node. 
llvm-svn: 175994
 2013-02-24 15:34:29 +00:00
Duncan Sands cca89124a2 Eliminate switch cases that can never match, for example removes all 
negative switch cases if the branch condition is known to be positive.
Inspired by a recent improvement to GCC's VRP.

llvm-svn: 152405
 2012-03-09 13:45:18 +00:00
Owen Anderson 8e7b73743d Update testcase since we're no longer doing the constant forwarding inline with correlated value propagation. 
llvm-svn: 117712
 2010-10-29 21:18:23 +00:00
Owen Anderson c91c1a205a Propagate non-local comparisons. Fixes PR1757. 
llvm-svn: 113025
 2010-09-03 22:47:08 +00:00
Owen Anderson c725462245 Add support for simplifying a load from a computed value to a load from a global when it 
is provable that they're equivalent.  This fixes PR4855.

llvm-svn: 112994
 2010-09-03 19:08:37 +00:00
Owen Anderson 50d8c8888c Add PR number to test. 
llvm-svn: 112971
 2010-09-03 16:58:25 +00:00
Owen Anderson 064b139c8d Rename test directory to reflect new pass name. 
llvm-svn: 112592
 2010-08-31 07:50:31 +00:00