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4 Commits

Author SHA1 Message Date
David Majnemer 161935520d [WinEH] Permit branch folding in the face of funclets 
Track which basic blocks belong to which funclets.  Permit branch
folding to fire but only if it can prove that doing so will not cause
code in one funclet to be reused in another.

llvm-svn: 249257
 2015-10-04 02:22:52 +00:00
David Majnemer 4600c06434 [WinEH] Stop BranchFolding from merging across funclets 
BranchFolding would merge two funclets together, this is not OK.
Disable this and strengthen the assertion in FuncletLayout.

llvm-svn: 249069
 2015-10-01 21:04:13 +00:00
David Majnemer f828a0ccc7 [WinEH] Make FuncletLayout more robust against catchret 
Catchret transfers control from a catch funclet to an earlier funclet.
However, it is not completely clear which funclet the catchret target is
part of.  Make this clear by stapling the catchret target's funclet
membership onto the CATCHRET SDAG node.

llvm-svn: 249052
 2015-10-01 18:44:59 +00:00
David Majnemer 978902309a [WinEH] Add a funclet layout pass 
Windows EH funclets need to be contiguous.  The FuncletLayout pass will
ensure that the funclets are together and begin with a funclet entry MBB.

Differential Revision: http://reviews.llvm.org/D12943

llvm-svn: 247937
 2015-09-17 20:45:18 +00:00