PTX: Add basic register spilling code
The current implementation generates stack loads/stores, which are
really just mov instructions from/to "special" registers. This may
not be the most efficient implementation, compared to an approach where
the stack registers are directly folded into instructions, but this is
easier to implement and I have yet to see a case where ptxas is unable
to see through this kind of register usage and know what is really
going on.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133443 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/PTX/PTXAsmPrinter.cpp b/lib/Target/PTX/PTXAsmPrinter.cpp
index df973fd..6f6fc29 100644
--- a/lib/Target/PTX/PTXAsmPrinter.cpp
+++ b/lib/Target/PTX/PTXAsmPrinter.cpp
@@ -23,6 +23,7 @@
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/Twine.h"
#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/MC/MCStreamer.h"
@@ -194,6 +195,18 @@
def += ';';
OutStreamer.EmitRawText(Twine(def));
}
+
+ const MachineFrameInfo* FrameInfo = MF->getFrameInfo();
+ DEBUG(dbgs() << "Have " << FrameInfo->getNumObjects() << " frame object(s)\n");
+ for (unsigned i = 0, e = FrameInfo->getNumObjects(); i != e; ++i) {
+ DEBUG(dbgs() << "Size of object: " << FrameInfo->getObjectSize(i) << "\n");
+ std::string def = "\t.reg .b";
+ def += utostr(FrameInfo->getObjectSize(i)*8); // Convert to bits
+ def += " s";
+ def += utostr(i);
+ def += ";";
+ OutStreamer.EmitRawText(Twine(def));
+ }
}
void PTXAsmPrinter::EmitInstruction(const MachineInstr *MI) {