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https://github.com/c64scene-ar/llvm-6502.git
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bebd59c74b
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
16 lines
411 B
LLVM
16 lines
411 B
LLVM
; Test general-dynamic TLS access optimizations.
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;
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; If we access the same TLS variable twice, there should only be
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; a single call to __tls_get_offset.
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;
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; RUN: llc < %s -mcpu=z10 -mtriple=s390x-linux-gnu -relocation-model=pic | grep "__tls_get_offset" | count 1
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@x = thread_local global i32 0
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define i32 @foo() {
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%val = load i32* @x
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%inc = add nsw i32 %val, 1
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store i32 %inc, i32* @x
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ret i32 %val
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}
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