llvm-project

Commit Graph

Author	SHA1	Message	Date
Sanjoy Das	4cad61adb3	[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. llvm-svn: 309758	2017-08-01 22:37:58 +00:00
Matt Arsenault	f10061ec70	Add address space mangling to lifetime intrinsics In preparation for allowing allocas to have non-0 addrspace. llvm-svn: 299876	2017-04-10 20:18:21 +00:00
Wei Mi	e2538b5639	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 llvm-svn: 238507	2015-05-28 21:49:07 +00:00

Author

SHA1

Message

Date

Sanjoy Das

4cad61adb3

[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.

llvm-svn: 309758

2017-08-01 22:37:58 +00:00

Matt Arsenault

f10061ec70

Add address space mangling to lifetime intrinsics

In preparation for allowing allocas to have non-0 addrspace.

llvm-svn: 299876

2017-04-10 20:18:21 +00:00

Wei Mi

e2538b5639

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

llvm-svn: 238507

2015-05-28 21:49:07 +00:00

3 Commits