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Update and consolidate comments. Remove some excess whitespace. 

llvm-svn: 15824
This commit is contained in:
Brian Gaeke 2004-08-16 18:27:25 +00:00
parent 224704fc6f
commit a7ae92436f
1 changed files with 6 additions and 15 deletions
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21
llvm/lib/Target/SparcV9/SparcV9PrologEpilogInserter.cpp
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@ -7,12 +7,12 @@
//
//===----------------------------------------------------------------------===//
//
// Insert SAVE/RESTORE instructions for the function
//
// Insert prolog code at the unique function entry point.
// Insert epilog code at each function exit point.
// InsertPrologEpilog invokes these only if the function is not compiled
// with the leaf function optimization.
// This is the SparcV9 target's own PrologEpilogInserter. It creates prolog and
// epilog instructions for functions which have not been compiled using "leaf
// function optimizations". These instructions include the SAVE and RESTORE
// instructions used to rotate the SPARC register windows. Prologs are
// attached to the unique function entry, and epilogs are attached to each
// function exit.
//
//===----------------------------------------------------------------------===//
@ -49,21 +49,14 @@ namespace {
} // End anonymous namespace
//------------------------------------------------------------------------
// Create prolog and epilog code for procedure entry and exit
//------------------------------------------------------------------------
static unsigned getStaticStackSize (MachineFunction &MF) {
const TargetFrameInfo& frameInfo = *MF.getTarget().getFrameInfo();
unsigned staticStackSize = MF.getInfo()->getStaticStackSize();
if (staticStackSize < (unsigned)SparcV9FrameInfo::MinStackFrameSize)
staticStackSize = SparcV9FrameInfo::MinStackFrameSize;
if (unsigned padsz = staticStackSize %
SparcV9FrameInfo::StackFrameSizeAlignment)
staticStackSize += SparcV9FrameInfo::StackFrameSizeAlignment - padsz;
return staticStackSize;
}
@ -76,7 +69,6 @@ void InsertPrologEpilogCode::InsertPrologCode(MachineFunction &MF)
// The second operand is the stack size. If it does not fit in the
// immediate field, we have to use a free register to hold the size.
// See the comments below for the choice of this register.
//
unsigned staticStackSize = getStaticStackSize (MF);
int32_t C = - (int) staticStackSize;
int SP = TM.getRegInfo()->getStackPointer();
@ -119,7 +111,6 @@ void InsertPrologEpilogCode::InsertPrologCode(MachineFunction &MF)
// (%i0 ... %i5 if K=6) .
// By copying the varargs arguments to the stack, va_arg() then can
// simply assume that all vararg arguments are in an array on the stack.
//
if (MF.getFunction()->getFunctionType()->isVarArg()) {
int numFixedArgs = MF.getFunction()->getFunctionType()->getNumParams();
int numArgRegs = TM.getRegInfo()->getNumOfIntArgRegs();