From 5b59e372dcb4776bd2acb4ae0c6438aead9fe7c2 Mon Sep 17 00:00:00 2001 From: Evan Cheng Date: Tue, 11 Mar 2008 07:16:00 +0000 Subject: In 32-bit mode, mark 64-bit GPR's as unallocatable. llvm-svn: 48217 --- llvm/lib/Target/X86/X86RegisterInfo.td | 3 +++ 1 file changed, 3 insertions(+) (limited to 'llvm/lib') diff --git a/llvm/lib/Target/X86/X86RegisterInfo.td b/llvm/lib/Target/X86/X86RegisterInfo.td index 93d2a510fbc..24402386c8e 100644 --- a/llvm/lib/Target/X86/X86RegisterInfo.td +++ b/llvm/lib/Target/X86/X86RegisterInfo.td @@ -415,6 +415,9 @@ def GR64 : RegisterClass<"X86", [i64], 64, GR64Class::allocation_order_end(const MachineFunction &MF) const { const TargetMachine &TM = MF.getTarget(); const TargetRegisterInfo *RI = TM.getRegisterInfo(); + const X86Subtarget &Subtarget = TM.getSubtarget(); + if (!Subtarget.is64Bit()) + return begin(); // None of these are allocatable in 32-bit. if (RI->hasFP(MF)) // Does the function dedicate RBP to being a frame ptr? return end()-2; // If so, don't allocate RSP or RBP else -- cgit v1.2.3