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[SystemZ][z/OS] Update lowerCall #68259

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Merged
merged 1 commit into from
Oct 5, 2023
Merged

[SystemZ][z/OS] Update lowerCall #68259

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12 changes: 12 additions & 0 deletions llvm/lib/Target/SystemZ/SystemZFrameLowering.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1423,6 +1423,18 @@ void SystemZXPLINKFrameLowering::processFunctionBeforeFrameFinalized(

// Setup stack frame offset
MFFrame.setOffsetAdjustment(Regs.getStackPointerBias());

// Nothing to do for leaf functions.
uint64_t StackSize = MFFrame.estimateStackSize(MF);
if (StackSize == 0 && MFFrame.getCalleeSavedInfo().empty())
return;

// Although the XPLINK specifications for AMODE64 state that minimum size
// of the param area is minimum 32 bytes and no rounding is otherwise
// specified, we round this area in 64 bytes increments to be compatible
// with existing compilers.
MFFrame.setMaxCallFrameSize(
std::max(64U, (unsigned)alignTo(MFFrame.getMaxCallFrameSize(), 64)));
}

// Determines the size of the frame, and creates the deferred spill objects.
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7 changes: 0 additions & 7 deletions llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
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Expand Up @@ -1816,13 +1816,6 @@ SystemZTargetLowering::LowerCall(CallLoweringInfo &CLI,
// Get a count of how many bytes are to be pushed on the stack.
unsigned NumBytes = ArgCCInfo.getStackSize();

if (Subtarget.isTargetXPLINK64())
// Although the XPLINK specifications for AMODE64 state that minimum size
// of the param area is minimum 32 bytes and no rounding is otherwise
// specified, we round this area in 64 bytes increments to be compatible
// with existing compilers.
NumBytes = std::max(64U, (unsigned)alignTo(NumBytes, 64));

// Mark the start of the call.
if (!IsTailCall)
Chain = DAG.getCALLSEQ_START(Chain, NumBytes, 0, DL);
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