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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176270 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Yiannis Tsiouris 2013-02-28 16:59:10 +00:00
parent 54a1cf75d2
commit 2d1035def1
1 changed files with 15 additions and 17 deletions
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32
lib/Target/X86/X86FrameLowering.cpp
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@ -1386,7 +1386,6 @@ HasNestArgument(const MachineFunction *MF) {
return false;
}
/// GetScratchRegister - Get a temp register for performing work in the
/// segmented stack and the Erlang/HiPE stack prologue. Depending on platform
/// and the properties of the function either one or two registers will be
@ -1612,22 +1611,21 @@ X86FrameLowering::adjustForSegmentedStacks(MachineFunction &MF) const {
#endif
}
// Erlang programs may need a special prologue to handle the stack size they
// might need at runtime. That is because Erlang/OTP does not implement a C
// stack but uses a custom implementation of hybrid stack/heap
// architecture. (for more information see Eric Stenman's Ph.D. thesis:
// http://publications.uu.se/uu/fulltext/nbn_se_uu_diva-2688.pdf)
//
//
// CheckStack:
// temp0 = sp - MaxStack
// if( temp0 < SP_LIMIT(P) ) goto IncStack else goto OldStart
// OldStart:
// ...
// IncStack:
// call inc_stack # doubles the stack space
// temp0 = sp - MaxStack
// if( temp0 < SP_LIMIT(P) ) goto IncStack else goto OldStart
/// Erlang programs may need a special prologue to handle the stack size they
/// might need at runtime. That is because Erlang/OTP does not implement a C
/// stack but uses a custom implementation of hybrid stack/heap architecture.
/// (for more information see Eric Stenman's Ph.D. thesis:
/// http://publications.uu.se/uu/fulltext/nbn_se_uu_diva-2688.pdf)
///
/// CheckStack:
/// temp0 = sp - MaxStack
/// if( temp0 < SP_LIMIT(P) ) goto IncStack else goto OldStart
/// OldStart:
/// ...
/// IncStack:
/// call inc_stack # doubles the stack space
/// temp0 = sp - MaxStack
/// if( temp0 < SP_LIMIT(P) ) goto IncStack else goto OldStart
void X86FrameLowering::adjustForHiPEPrologue(MachineFunction &MF) const {
const X86InstrInfo &TII = *TM.getInstrInfo();
MachineFrameInfo *MFI = MF.getFrameInfo();