[AArch64] Implement GHC calling convention
Original patch by Luke Iannini. Minor improvements and test added by
Erik de Castro Lopo.
Differential Revision: http://reviews.llvm.org/D6877
From: Erik de Castro Lopo <erikd@mega-nerd.com>
llvm-svn: 226473
diff --git a/llvm/lib/Target/AArch64/AArch64FrameLowering.cpp b/llvm/lib/Target/AArch64/AArch64FrameLowering.cpp
index 66aa216..d8e9156 100644
--- a/llvm/lib/Target/AArch64/AArch64FrameLowering.cpp
+++ b/llvm/lib/Target/AArch64/AArch64FrameLowering.cpp
@@ -215,6 +215,11 @@
bool HasFP = hasFP(MF);
DebugLoc DL = MBB.findDebugLoc(MBBI);
+ // All calls are tail calls in GHC calling conv, and functions have no
+ // prologue/epilogue.
+ if (MF.getFunction()->getCallingConv() == CallingConv::GHC)
+ return;
+
int NumBytes = (int)MFI->getStackSize();
if (!AFI->hasStackFrame()) {
assert(!HasFP && "unexpected function without stack frame but with FP");
@@ -451,6 +456,11 @@
int NumBytes = MFI->getStackSize();
const AArch64FunctionInfo *AFI = MF.getInfo<AArch64FunctionInfo>();
+ // All calls are tail calls in GHC calling conv, and functions have no
+ // prologue/epilogue.
+ if (MF.getFunction()->getCallingConv() == CallingConv::GHC)
+ return;
+
// Initial and residual are named for consitency with the prologue. Note that
// in the epilogue, the residual adjustment is executed first.
uint64_t ArgumentPopSize = 0;