svn commit: r305218 - head/contrib/llvm/lib/Target/AArch64

[Dimitry Andric]

Author: dim
Date: Thu Sep  1 18:11:44 2016
New Revision: 305218
URL: https://svnweb.freebsd.org/changeset/base/305218

Log:
  Pull in r277331 from upstream llvm trunk (by Diana Picus):
  
    [AArch64] Return the correct size for TLSDESC_CALLSEQ
  
    The branch relaxation pass is computing the wrong offsets because it assumes
    TLSDESC_CALLSEQ eats up 4 bytes, when in fact it is lowered to an instruction
    sequence taking up 16 bytes. This can become a problem in huge files with lots
    of TLS accesses, as it may slowly move branch targets out of the range computed
    by the branch relaxation pass.
  
    Fixes PR24234 https://llvm.org/bugs/show_bug.cgi?id=24234
  
    Differential Revision: https://reviews.llvm.org/D22870
  
  This fixes "error in backend: fixup value out of range" when compiling
  the misc/talkfilters port for AArch64.
  
  Reported by:	sbruno
  PR:		201762
  MFC after:	3 days

Modified:
  head/contrib/llvm/lib/Target/AArch64/AArch64InstrInfo.cpp

Modified: head/contrib/llvm/lib/Target/AArch64/AArch64InstrInfo.cpp
==============================================================================
--- head/contrib/llvm/lib/Target/AArch64/AArch64InstrInfo.cpp	Thu Sep  1 18:03:34 2016	(r305217)
+++ head/contrib/llvm/lib/Target/AArch64/AArch64InstrInfo.cpp	Thu Sep  1 18:11:44 2016	(r305218)
@@ -52,6 +52,9 @@ unsigned AArch64InstrInfo::GetInstSizeIn
   case TargetOpcode::IMPLICIT_DEF:
   case TargetOpcode::KILL:
     return 0;
+  case AArch64::TLSDESC_CALLSEQ:
+    // This gets lowered to an instruction sequence which takes 16 bytes
+    return 16;
   }
 
   llvm_unreachable("GetInstSizeInBytes()- Unable to determin insn size");