diff options
| -rw-r--r-- | lib/Target/X86/X86RegisterInfo.td | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/lib/Target/X86/X86RegisterInfo.td b/lib/Target/X86/X86RegisterInfo.td index 4262a9ffd7..628a239d01 100644 --- a/lib/Target/X86/X86RegisterInfo.td +++ b/lib/Target/X86/X86RegisterInfo.td @@ -86,5 +86,13 @@ def R32 : RegisterClass<i32, 32, [EAX, ECX, EDX, ESI, EDI, EBX, EBP, ESP]> { def RFP : RegisterClass<f80, 32, [FP0, FP1, FP2, FP3, FP4, FP5, FP6]>; -// Floating point stack registers. -def RST : RegisterClass<f80, 32, [ST0, ST1, ST2, ST3, ST4, ST5, ST6, ST7]>; +// Floating point stack registers (these are not allocatable by the +// register allocator - the floating point stackifier is responsible +// for transforming FPn allocations to STn registers) +def RST : RegisterClass<f80, 32, [ST0, ST1, ST2, ST3, ST4, ST5, ST6, ST7]> { + let Methods = [{ + iterator allocation_order_end(MachineFunction &MF) const { + return begin(); + } + }]; +} |