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GCC supports -mtls-dialect= for several architectures to select TLSDESC. This patch supports the following values * x86: "gnu". "gnu2" (TLSDESC) is not supported yet. * RISC-V: "trad" (general dynamic), "desc" (TLSDESC, see #66915) AArch64 toolchains seem to support TLSDESC from the beginning, and the general dynamic model has poor support. Nobody seems to use the option -mtls-dialect= at all, so we don't bother with it. There also seems very little interest in AArch32's TLSDESC support. TLSDESC does not change IR, but affects object file generation. Without a backend option the option is a no-op for in-process ThinLTO. There seems no motivation to have fine-grained control mixing trad/desc for TLS, so we just pass -mllvm, and don't bother with a modules flag metadata or function attribute. Co-authored-by: Paul Kirth <paulkirth@google.com>
15 lines
520 B
C
15 lines
520 B
C
// REQUIRES: riscv-registered-target
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/// cc1 -enable-tlsdesc (due to -mtls-dialect=desc) enables TLSDESC.
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// RUN: %clang_cc1 -triple riscv64 -S -mrelocation-model pic -pic-level 1 -enable-tlsdesc %s -o - | FileCheck %s --check-prefix=DESC
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// RUN: %clang_cc1 -triple riscv64 -S -mrelocation-model pic -pic-level 1 %s -o - | FileCheck %s --check-prefix=NODESC
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__thread int x;
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// DESC: %tlsdesc_hi
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// DESC-NOT: %tls_gd_pcrel_hi
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// NODESC: %tls_gd_pcrel_hi
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// NODESC-NOT: %tlsdesc_hi
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int use() {
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return x;
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}
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