From 9f9e4681ace64e6200f82d9d7f011701fd4e9cc8 Mon Sep 17 00:00:00 2001 From: Chih-Hung Hsieh Date: Wed, 28 Feb 2018 17:48:55 +0000 Subject: [TLS] use emulated TLS if the target supports only this mode Emulated TLS is enabled by llc flag -emulated-tls, which is passed by clang driver. When llc is called explicitly or from other drivers like LTO, missing -emulated-tls flag would generate wrong TLS code for targets that supports only this mode. Now use useEmulatedTLS() instead of Options.EmulatedTLS to decide whether emulated TLS code should be generated. Unit tests are modified to run with and without the -emulated-tls flag. Differential Revision: https://reviews.llvm.org/D42999 llvm-svn: 326341 --- llvm/lib/Target/TargetMachine.cpp | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'llvm/lib/Target/TargetMachine.cpp') diff --git a/llvm/lib/Target/TargetMachine.cpp b/llvm/lib/Target/TargetMachine.cpp index 826766890dd..2a0968565f2 100644 --- a/llvm/lib/Target/TargetMachine.cpp +++ b/llvm/lib/Target/TargetMachine.cpp @@ -192,6 +192,14 @@ bool TargetMachine::shouldAssumeDSOLocal(const Module &M, return false; } +bool TargetMachine::useEmulatedTLS() const { + // Returns Options.EmulatedTLS if the -emulated-tls or -no-emulated-tls + // was specified explicitly; otherwise uses target triple to decide default. + if (Options.ExplicitEmulatedTLS) + return Options.EmulatedTLS; + return getTargetTriple().hasDefaultEmulatedTLS(); +} + TLSModel::Model TargetMachine::getTLSModel(const GlobalValue *GV) const { bool IsPIE = GV->getParent()->getPIELevel() != PIELevel::Default; Reloc::Model RM = getRelocationModel(); -- cgit v1.2.3