llvm-6502/test/CodeGen/SystemZ/tls-01.ll
Ulrich Weigand bebd59c74b [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
2015-02-18 09:13:27 +00:00

23 lines
686 B
LLVM

; Test local-exec TLS accesses.
;
; 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
; The offset must be loaded from the constant pool. It doesn't really
; matter whether we use LARL/AG or LGRL/AGR for the last part.
define i32 *@foo() {
; CHECK-CP: .LCP{{.*}}:
; CHECK-CP: .quad x@NTPOFF
;
; CHECK-MAIN-LABEL: foo:
; CHECK-MAIN: ear [[HIGH:%r[0-5]]], %a0
; CHECK-MAIN: sllg %r2, [[HIGH]], 32
; CHECK-MAIN: ear %r2, %a1
; CHECK-MAIN: larl %r1, .LCP{{.*}}
; CHECK-MAIN: ag %r2, 0(%r1)
; CHECK-MAIN: br %r14
ret i32 *@x
}