diff options
| -rw-r--r-- | lib/Target/X86/X86RegisterInfo.cpp | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/lib/Target/X86/X86RegisterInfo.cpp b/lib/Target/X86/X86RegisterInfo.cpp index 1ad6203af2..9b013a323d 100644 --- a/lib/Target/X86/X86RegisterInfo.cpp +++ b/lib/Target/X86/X86RegisterInfo.cpp @@ -517,13 +517,20 @@ BitVector X86RegisterInfo::getReservedRegs(const MachineFunction &MF) const { // Reserve the registers that only exist in 64-bit mode. if (!Is64Bit) { + // These 8-bit registers are part of the x86-64 extension even though their + // super-registers are old 32-bits. + Reserved.set(X86::SIL); + Reserved.set(X86::DIL); + Reserved.set(X86::BPL); + Reserved.set(X86::SPL); + for (unsigned n = 0; n != 8; ++n) { + // R8, R9, ... const unsigned GPR64[] = { X86::R8, X86::R9, X86::R10, X86::R11, X86::R12, X86::R13, X86::R14, X86::R15 }; - for (const unsigned *AI = getOverlaps(GPR64[n]); unsigned Reg = *AI; - ++AI) + for (const unsigned *AI = getOverlaps(GPR64[n]); unsigned Reg = *AI; ++AI) Reserved.set(Reg); // XMM8, XMM9, ... |