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Arnold Schwaighofer e672548602 SCEVExpander: Try hard not to create derived induction variables in other loops 
During LSR of one loop we can run into a situation where we have to expand the
start of a recurrence of a loop induction variable in this loop. This start
value is a value derived of the induction variable of a preceeding loop. SCEV
has cannonicalized this value to a different recurrence than the recurrence of
the preceeding loop's induction variable (the type and/or step direction) has
changed). When we come to instantiate this SCEV we created a second induction
variable in this preceeding loop.  This patch tries to base such derived
induction variables of the preceeding loop's induction variable.

This helps twolf on arm and seems to help scimark2 on x86.

radar://15970709

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201465 91177308-0d34-0410-b5e6-96231b3b80d8
2014-02-15 17:11:56 +00:00
autoconf
bindings
cmake [CMake] Let llvm_add_library(MODULE) check capability of loadable module. 2014-02-13 11:25:17 +00:00
docs Cleanup docs about lit substitutions 2014-02-15 08:35:56 +00:00
examples
include SCEVExpander: Try hard not to create derived induction variables in other loops 2014-02-15 17:11:56 +00:00
lib SCEVExpander: Try hard not to create derived induction variables in other loops 2014-02-15 17:11:56 +00:00
projects
test SCEVExpander: Try hard not to create derived induction variables in other loops 2014-02-15 17:11:56 +00:00
tools MSBuild integration: get the LibraryPath right (PR18707) 2014-02-13 22:01:35 +00:00
unittests Remove tautological test line (unsigneds are always >=0). 2014-02-15 00:45:14 +00:00
utils
.arcconfig
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CODE_OWNERS.TXT Remove myself as owner of libc++ 2014-02-14 21:09:01 +00:00
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