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d35c322d54
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. llvm-svn: 229654
29 lines
984 B
LLVM
29 lines
984 B
LLVM
; Test local-dynamic TLS accesses.
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;
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; RUN: llc < %s -mcpu=z10 -mtriple=s390x-linux-gnu -relocation-model=pic | FileCheck %s -check-prefix=CHECK-MAIN
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; RUN: llc < %s -mcpu=z10 -mtriple=s390x-linux-gnu -relocation-model=pic | FileCheck %s -check-prefix=CHECK-CP
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@x = thread_local(localdynamic) global i32 0
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; Call __tls_get_offset to retrieve the module's TLS base offset.
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; Add the per-symbol offset and the thread pointer.
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define i32 *@foo() {
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; CHECK-CP: .LCP{{.*}}_0:
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; CHECK-CP: .quad x@TLSLDM
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; CHECK-CP: .LCP{{.*}}_1:
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; CHECK-CP: .quad x@DTPOFF
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;
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; CHECK-MAIN-LABEL: foo:
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; CHECK-MAIN-DAG: larl %r12, _GLOBAL_OFFSET_TABLE_
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; CHECK-MAIN-DAG: lgrl %r2, .LCP{{.*}}_0
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; CHECK-MAIN: brasl %r14, __tls_get_offset@PLT:tls_ldcall:x
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; CHECK-MAIN: larl %r1, .LCP{{.*}}_1
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; CHECK-MAIN: ag %r2, 0(%r1)
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; CHECK-MAIN: ear [[HIGH:%r[0-5]]], %a0
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; CHECK-MAIN: sllg [[TP:%r[0-5]]], [[HIGH]], 32
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; CHECK-MAIN: ear [[TP]], %a1
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; CHECK-MAIN: agr %r2, [[TP]]
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; CHECK-MAIN: br %r14
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ret i32 *@x
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}
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