This patch improves the 64-bit PowerPC InitialExec TLS support by providing

for a wider range of GOT entries that can hold thread-relative offsets.
This matches the behavior of GCC, which was not documented in the PPC64 TLS
ABI.  The ABI will be updated with the new code sequence.

Former sequence:

  ld 9,x@got@tprel(2)
  add 9,9,x@tls

New sequence:

  addis 9,2,x@got@tprel@ha
  ld 9,x@got@tprel@l(9)
  add 9,9,x@tls

Note that a linker optimization exists to transform the new sequence into
the shorter sequence when appropriate, by replacing the addis with a nop
and modifying the base register and relocation type of the ld.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170209 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 0 insertions, 13 deletions

diff --git a/lib/Target/PowerPC/MCTargetDesc/PPCMCCodeEmitter.cpp b/lib/Target/PowerPC/MCTargetDesc/PPCMCCodeEmitter.cpp
index 71f317abc2..d048426d43 100644
--- a/lib/Target/PowerPC/MCTargetDesc/PPCMCCodeEmitter.cpp
+++ b/lib/Target/PowerPC/MCTargetDesc/PPCMCCodeEmitter.cpp
@@ -63,8 +63,6 @@ public:
                             SmallVectorImpl<MCFixup> &Fixups) const;
   unsigned getMemRIXEncoding(const MCInst &MI, unsigned OpNo,
                              SmallVectorImpl<MCFixup> &Fixups) const;
-  unsigned getTLSOffsetEncoding(const MCInst &MI, unsigned OpNo,
-                                SmallVectorImpl<MCFixup> &Fixups) const;
   unsigned getTLSRegEncoding(const MCInst &MI, unsigned OpNo,
                              SmallVectorImpl<MCFixup> &Fixups) const;
   unsigned get_crbitm_encoding(const MCInst &MI, unsigned OpNo,
@@ -212,17 +210,6 @@ unsigned PPCMCCodeEmitter::getMemRIXEncoding(const MCInst &MI, unsigned OpNo,
 }
 
 
-unsigned PPCMCCodeEmitter::getTLSOffsetEncoding(const MCInst &MI, unsigned OpNo,
-                                       SmallVectorImpl<MCFixup> &Fixups) const {
-  const MCOperand &MO = MI.getOperand(OpNo);
-  
-  // Add a fixup for the GOT displacement to the TLS block offset.
-  Fixups.push_back(MCFixup::Create(0, MO.getExpr(),
-                                   (MCFixupKind)PPC::fixup_ppc_toc16_ds));
-  return 0;
-}
-
-
 unsigned PPCMCCodeEmitter::getTLSRegEncoding(const MCInst &MI, unsigned OpNo,
                                        SmallVectorImpl<MCFixup> &Fixups) const {
   const MCOperand &MO = MI.getOperand(OpNo);