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path: root/lib/Target/XCore/XCoreFrameLowering.cpp
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Diffstat (limited to 'lib/Target/XCore/XCoreFrameLowering.cpp')
-rw-r--r--lib/Target/XCore/XCoreFrameLowering.cpp71
1 files changed, 60 insertions, 11 deletions
diff --git a/lib/Target/XCore/XCoreFrameLowering.cpp b/lib/Target/XCore/XCoreFrameLowering.cpp
index e18d97384d3db..beeb07f831c67 100644
--- a/lib/Target/XCore/XCoreFrameLowering.cpp
+++ b/lib/Target/XCore/XCoreFrameLowering.cpp
@@ -16,16 +16,16 @@
#include "XCore.h"
#include "XCoreInstrInfo.h"
#include "XCoreMachineFunctionInfo.h"
-#include "llvm/Function.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/RegisterScavenging.h"
-#include "llvm/DataLayout.h"
-#include "llvm/Target/TargetOptions.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/Function.h"
#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Target/TargetOptions.h"
using namespace llvm;
@@ -98,13 +98,10 @@ void XCoreFrameLowering::emitPrologue(MachineFunction &MF) const {
DebugLoc dl = MBBI != MBB.end() ? MBBI->getDebugLoc() : DebugLoc();
bool FP = hasFP(MF);
- const AttrListPtr &PAL = MF.getFunction()->getAttributes();
+ const AttributeSet &PAL = MF.getFunction()->getAttributes();
- for (unsigned I = 0, E = PAL.getNumAttrs(); I != E; ++I)
- if (PAL.getAttributesAtIndex(I).hasAttribute(Attributes::Nest)) {
- loadFromStack(MBB, MBBI, XCore::R11, 0, dl, TII);
- break;
- }
+ if (PAL.hasAttrSomewhere(Attribute::Nest))
+ loadFromStack(MBB, MBBI, XCore::R11, 0, dl, TII);
// Work out frame sizes.
int FrameSize = MFI->getStackSize();
@@ -264,7 +261,7 @@ void XCoreFrameLowering::emitEpilogue(MachineFunction &MF,
BuildMI(MBB, MBBI, dl, TII.get(Opcode)).addImm(FrameSize);
MBB.erase(MBBI);
} else {
- int Opcode = (isU6) ? XCore::LDAWSP_ru6_RRegs : XCore::LDAWSP_lru6_RRegs;
+ int Opcode = (isU6) ? XCore::LDAWSP_ru6 : XCore::LDAWSP_lru6;
BuildMI(MBB, MBBI, dl, TII.get(Opcode), XCore::SP).addImm(FrameSize);
}
}
@@ -335,6 +332,58 @@ bool XCoreFrameLowering::restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
return true;
}
+// This function eliminates ADJCALLSTACKDOWN,
+// ADJCALLSTACKUP pseudo instructions
+void XCoreFrameLowering::
+eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator I) const {
+ const XCoreInstrInfo &TII =
+ *static_cast<const XCoreInstrInfo*>(MF.getTarget().getInstrInfo());
+ if (!hasReservedCallFrame(MF)) {
+ // Turn the adjcallstackdown instruction into 'extsp <amt>' and the
+ // adjcallstackup instruction into 'ldaw sp, sp[<amt>]'
+ MachineInstr *Old = I;
+ uint64_t Amount = Old->getOperand(0).getImm();
+ if (Amount != 0) {
+ // We need to keep the stack aligned properly. To do this, we round the
+ // amount of space needed for the outgoing arguments up to the next
+ // alignment boundary.
+ unsigned Align = getStackAlignment();
+ Amount = (Amount+Align-1)/Align*Align;
+
+ assert(Amount%4 == 0);
+ Amount /= 4;
+
+ bool isU6 = isImmU6(Amount);
+ if (!isU6 && !isImmU16(Amount)) {
+ // FIX could emit multiple instructions in this case.
+#ifndef NDEBUG
+ errs() << "eliminateCallFramePseudoInstr size too big: "
+ << Amount << "\n";
+#endif
+ llvm_unreachable(0);
+ }
+
+ MachineInstr *New;
+ if (Old->getOpcode() == XCore::ADJCALLSTACKDOWN) {
+ int Opcode = isU6 ? XCore::EXTSP_u6 : XCore::EXTSP_lu6;
+ New=BuildMI(MF, Old->getDebugLoc(), TII.get(Opcode))
+ .addImm(Amount);
+ } else {
+ assert(Old->getOpcode() == XCore::ADJCALLSTACKUP);
+ int Opcode = isU6 ? XCore::LDAWSP_ru6 : XCore::LDAWSP_lru6;
+ New=BuildMI(MF, Old->getDebugLoc(), TII.get(Opcode), XCore::SP)
+ .addImm(Amount);
+ }
+
+ // Replace the pseudo instruction with a new instruction...
+ MBB.insert(I, New);
+ }
+ }
+
+ MBB.erase(I);
+}
+
void
XCoreFrameLowering::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
RegScavenger *RS) const {
@@ -360,7 +409,7 @@ XCoreFrameLowering::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
}
if (RegInfo->requiresRegisterScavenging(MF)) {
// Reserve a slot close to SP or frame pointer.
- RS->setScavengingFrameIndex(MFI->CreateStackObject(RC->getSize(),
+ RS->addScavengingFrameIndex(MFI->CreateStackObject(RC->getSize(),
RC->getAlignment(),
false));
}