[WinEH] Mark funclet entries and exits as clobbering all registers
authorReid Kleckner <rnk@google.com>
Fri, 6 Nov 2015 17:06:38 +0000 (17:06 +0000)
committerReid Kleckner <rnk@google.com>
Fri, 6 Nov 2015 17:06:38 +0000 (17:06 +0000)
Summary:
In this implementation, LiveIntervalAnalysis invents a few register
masks on basic block boundaries that preserve no registers. The nice
thing about this is that it prevents the prologue inserter from thinking
it needs to spill all XMM CSRs, because it doesn't see any explicit
physreg defs in the MI.

Reviewers: MatzeB, qcolombet, JosephTremoulet, majnemer

Subscribers: MatzeB, llvm-commits

Differential Revision: http://reviews.llvm.org/D14407

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@252318 91177308-0d34-0410-b5e6-96231b3b80d8


No differences found