[X86] Update an outdated comment about SjLj

The SjLj intrinsics in the X86 backend are intended for use with
SjLj exception handling as well, since SVN r271244.

Differential Revision: https://reviews.llvm.org/D38532

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@315146 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 8f0bfd470da3a3815711519121768552a7be8022..36877ac13bc43d5c7bf171ee5ae986e156f909e9 100644 (file)
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -425,12 +425,8 @@ X86TargetLowering::X86TargetLowering(const X86TargetMachine &TM,
   setOperationAction(ISD::SELECT_CC, MVT::x86mmx, Expand);
 
   setOperationAction(ISD::EH_RETURN       , MVT::Other, Custom);
-  // NOTE: EH_SJLJ_SETJMP/_LONGJMP supported here is NOT intended to support
-  // SjLj exception handling but a light-weight setjmp/longjmp replacement to
-  // support continuation, user-level threading, and etc.. As a result, no
-  // other SjLj exception interfaces are implemented and please don't build
-  // your own exception handling based on them.
-  // LLVM/Clang supports zero-cost DWARF exception handling.
+  // NOTE: EH_SJLJ_SETJMP/_LONGJMP are not recommended, since
+  // LLVM/Clang supports zero-cost DWARF and SEH exception handling.
   setOperationAction(ISD::EH_SJLJ_SETJMP, MVT::i32, Custom);
   setOperationAction(ISD::EH_SJLJ_LONGJMP, MVT::Other, Custom);
   setOperationAction(ISD::EH_SJLJ_SETUP_DISPATCH, MVT::Other, Custom);