Move estimateStackSize from ARM into MachineFrameInfo
This is a generic function (derived from PEI); moving it into
MachineFrameInfo eliminates a current redundancy between the ARM and AArch64
backends, and will allow it to be used by the PowerPC target code.
No functionality change intended.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177111 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMFrameLowering.cpp b/lib/Target/ARM/ARMFrameLowering.cpp
index 0ca6450..3b12408 100644
--- a/lib/Target/ARM/ARMFrameLowering.cpp
+++ b/lib/Target/ARM/ARMFrameLowering.cpp
@@ -1038,58 +1038,6 @@
return FnSize;
}
-/// estimateStackSize - Estimate and return the size of the frame.
-/// FIXME: Make generic?
-static unsigned estimateStackSize(MachineFunction &MF) {
- const MachineFrameInfo *MFI = MF.getFrameInfo();
- const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
- const TargetRegisterInfo *RegInfo = MF.getTarget().getRegisterInfo();
- unsigned MaxAlign = MFI->getMaxAlignment();
- int Offset = 0;
-
- // This code is very, very similar to PEI::calculateFrameObjectOffsets().
- // It really should be refactored to share code. Until then, changes
- // should keep in mind that there's tight coupling between the two.
-
- for (int i = MFI->getObjectIndexBegin(); i != 0; ++i) {
- int FixedOff = -MFI->getObjectOffset(i);
- if (FixedOff > Offset) Offset = FixedOff;
- }
- for (unsigned i = 0, e = MFI->getObjectIndexEnd(); i != e; ++i) {
- if (MFI->isDeadObjectIndex(i))
- continue;
- Offset += MFI->getObjectSize(i);
- unsigned Align = MFI->getObjectAlignment(i);
- // Adjust to alignment boundary
- Offset = (Offset+Align-1)/Align*Align;
-
- MaxAlign = std::max(Align, MaxAlign);
- }
-
- if (MFI->adjustsStack() && TFI->hasReservedCallFrame(MF))
- Offset += MFI->getMaxCallFrameSize();
-
- // Round up the size to a multiple of the alignment. If the function has
- // any calls or alloca's, align to the target's StackAlignment value to
- // ensure that the callee's frame or the alloca data is suitably aligned;
- // otherwise, for leaf functions, align to the TransientStackAlignment
- // value.
- unsigned StackAlign;
- if (MFI->adjustsStack() || MFI->hasVarSizedObjects() ||
- (RegInfo->needsStackRealignment(MF) && MFI->getObjectIndexEnd() != 0))
- StackAlign = TFI->getStackAlignment();
- else
- StackAlign = TFI->getTransientStackAlignment();
-
- // If the frame pointer is eliminated, all frame offsets will be relative to
- // SP not FP. Align to MaxAlign so this works.
- StackAlign = std::max(StackAlign, MaxAlign);
- unsigned AlignMask = StackAlign - 1;
- Offset = (Offset + AlignMask) & ~uint64_t(AlignMask);
-
- return (unsigned)Offset;
-}
-
/// estimateRSStackSizeLimit - Look at each instruction that references stack
/// frames and return the stack size limit beyond which some of these
/// instructions will require a scratch register during their expansion later.
@@ -1235,7 +1183,7 @@
// we've used all the registers and so R4 is already used, so not marking
// it here will be OK.
// FIXME: It will be better just to find spare register here.
- unsigned StackSize = estimateStackSize(MF);
+ unsigned StackSize = MFI->estimateStackSize(MF);
if (MFI->hasVarSizedObjects() || StackSize > 508)
MRI.setPhysRegUsed(ARM::R4);
}
@@ -1330,7 +1278,8 @@
// worth the effort and added fragility?
bool BigStack =
(RS &&
- (estimateStackSize(MF) + ((hasFP(MF) && AFI->hasStackFrame()) ? 4:0) >=
+ (MFI->estimateStackSize(MF) +
+ ((hasFP(MF) && AFI->hasStackFrame()) ? 4:0) >=
estimateRSStackSizeLimit(MF, this)))
|| MFI->hasVarSizedObjects()
|| (MFI->adjustsStack() && !canSimplifyCallFramePseudos(MF));