diff options
Diffstat (limited to 'llvm/lib/Target/Target.td')
| -rw-r--r-- | llvm/lib/Target/Target.td | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/llvm/lib/Target/Target.td b/llvm/lib/Target/Target.td index 094a4adf3ba..fce45a5c2d4 100644 --- a/llvm/lib/Target/Target.td +++ b/llvm/lib/Target/Target.td @@ -67,13 +67,15 @@ class RegisterWithSubRegs<string n, list<Register> subregs> : Register<n> { let SubRegs = subregs; } -// RegisterGroup - This can be used to define instances of Register which -// need to specify aliases. -// List "aliases" specifies which registers are aliased to this one. This -// allows the code generator to be careful not to put two values with -// overlapping live ranges into registers which alias. -class RegisterGroup<string n, list<Register> aliases> : Register<n> { - let Aliases = aliases; +// SubRegSet - This can be used to define a specific mapping of registers to +// indices, for use as named subregs of a particular physical register. Each +// register in 'subregs' becomes an addressable subregister at index 'n' of the +// corresponding register in 'regs'. +class SubRegSet<int n, list<Register> regs, list<Register> subregs> { + int index = n; + + list<Register> From = regs; + list<Register> To = subregs; } // RegisterClass - Now that all of the registers are defined, and aliases |
