[SystemZ] Support all TLS access models - CodeGen part

The current SystemZ back-end only supports the local-exec TLS access model.
This patch adds all required CodeGen support for the other TLS models, which
means in particular:

- Expand initial-exec TLS accesses by loading TLS offsets from the GOT
  using @indntpoff relocations.

- Expand general-dynamic and local-dynamic accesses by generating the
  appropriate calls to __tls_get_offset.  Note that this routine has
  a non-standard ABI and requires loading the GOT pointer into %r12,
  so the patch also adds support for the GLOBAL_OFFSET_TABLE ISD node.

- Add a new platform-specific optimization pass to remove redundant
  __tls_get_offset calls in the local-dynamic model (modeled after
  the corresponding X86 pass).

- Add test cases verifying all access models and optimizations.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229654 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 3 insertions, 3 deletions

diff --git a/test/CodeGen/SystemZ/tls-01.ll b/test/CodeGen/SystemZ/tls-01.ll
index 16bc8f6e500..da7176c0599 100644
--- a/test/CodeGen/SystemZ/tls-01.ll
+++ b/test/CodeGen/SystemZ/tls-01.ll
@@ -1,7 +1,7 @@
-; Test initial-exec TLS accesses.
+; Test local-exec TLS accesses.
 ;
-; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s -check-prefix=CHECK-MAIN
-; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s -check-prefix=CHECK-CP
+; RUN: llc < %s -mcpu=z10 -mtriple=s390x-linux-gnu | FileCheck %s -check-prefix=CHECK-MAIN
+; RUN: llc < %s -mcpu=z10 -mtriple=s390x-linux-gnu | FileCheck %s -check-prefix=CHECK-CP
 
 @x = thread_local global i32 0