diff options
Diffstat (limited to 'lib/Target/X86/X86RegisterInfo.cpp')
| -rw-r--r-- | lib/Target/X86/X86RegisterInfo.cpp | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/lib/Target/X86/X86RegisterInfo.cpp b/lib/Target/X86/X86RegisterInfo.cpp index c1ac9f3431..9d7863c6ba 100644 --- a/lib/Target/X86/X86RegisterInfo.cpp +++ b/lib/Target/X86/X86RegisterInfo.cpp @@ -665,7 +665,7 @@ unsigned getX86SubSuperRegister(unsigned Reg, EVT VT, bool High) { case MVT::i8: if (High) { switch (Reg) { - default: return 0; + default: return getX86SubSuperRegister(Reg, MVT::i64, High); case X86::AH: case X86::AL: case X86::AX: case X86::EAX: case X86::RAX: return X86::AH; case X86::DH: case X86::DL: case X86::DX: case X86::EDX: case X86::RDX: @@ -785,6 +785,22 @@ unsigned getX86SubSuperRegister(unsigned Reg, EVT VT, bool High) { return X86::R15D; } case MVT::i64: + // For 64-bit mode if we've requested a "high" register and the + // Q or r constraints we want one of these high registers or + // just the register name otherwise. + if (High) { + switch (Reg) { + case X86::SIL: case X86::SI: case X86::ESI: case X86::RSI: + return X86::SI; + case X86::DIL: case X86::DI: case X86::EDI: case X86::RDI: + return X86::DI; + case X86::BPL: case X86::BP: case X86::EBP: case X86::RBP: + return X86::BP; + case X86::SPL: case X86::SP: case X86::ESP: case X86::RSP: + return X86::SP; + // Fallthrough. + } + } switch (Reg) { default: return Reg; case X86::AH: case X86::AL: case X86::AX: case X86::EAX: case X86::RAX: |