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3 Commits

Author SHA1 Message Date
Sanjoy Das 2d38e17cd0 [SCEV/IndVars] Always compute loop exiting values if the backedge count is 0 
If SCEV can prove that the backedge taken count for a loop is zero, it does not
need to "understand" a recursive PHI to compute its exiting value.

This should fix PR33885.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@309758 91177308-0d34-0410-b5e6-96231b3b80d8
 2017-08-01 22:37:58 +00:00
Matt Arsenault bdbe8280f2 Add address space mangling to lifetime intrinsics 
In preparation for allowing allocas to have non-0 addrspace.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@299876 91177308-0d34-0410-b5e6-96231b3b80d8
 2017-04-10 20:18:21 +00:00
Wei Mi 61897e8564 Enable exitValue rewrite only when the cost of expansion is low. 
The patch evaluates the expansion cost of exitValue in indVarSimplify pass, and only does the rewriting when the expansion cost is low or loop can be deleted with the rewriting. It provides an option "-replexitval=" to control the default aggressiveness of the exitvalue rewriting. It also fixes some missing cases in SCEVExpander::isHighCostExpansionHelper to enhance the evaluation of SCEV expansion cost.

Differential Revision: http://reviews.llvm.org/D9800


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238507 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-28 21:49:07 +00:00