diff options
Diffstat (limited to 'llvm/lib/Target/X86/X86Subtarget.cpp')
| -rw-r--r-- | llvm/lib/Target/X86/X86Subtarget.cpp | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/llvm/lib/Target/X86/X86Subtarget.cpp b/llvm/lib/Target/X86/X86Subtarget.cpp index 9ab751e2b00..d66d39dcee1 100644 --- a/llvm/lib/Target/X86/X86Subtarget.cpp +++ b/llvm/lib/Target/X86/X86Subtarget.cpp @@ -139,12 +139,18 @@ X86Subtarget::classifyGlobalFunctionReference(const GlobalValue *GV, return X86II::MO_NO_FLAG; assert(!isTargetCOFF()); + const Function *F = dyn_cast_or_null<Function>(GV); - if (isTargetELF()) + if (isTargetELF()) { + if (is64Bit() && F && (CallingConv::X86_RegCall == F->getCallingConv())) + // According to psABI, PLT stub clobbers XMM8-XMM15. + // In Regcall calling convention those registers are used for passing + // parameters. Thus we need to prevent lazy binding in Regcall. + return X86II::MO_GOTPCREL; return X86II::MO_PLT; + } if (is64Bit()) { - auto *F = dyn_cast_or_null<Function>(GV); if (F && F->hasFnAttribute(Attribute::NonLazyBind)) // If the function is marked as non-lazy, generate an indirect call // which loads from the GOT directly. This avoids runtime overhead |
