It's not necessary to do rounding for alloca operations when the requested
alignment is equal to the stack alignment.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40004 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/PowerPC/PPCFrameInfo.h b/lib/Target/PowerPC/PPCFrameInfo.h
new file mode 100644
index 0000000..81365e9
--- /dev/null
+++ b/lib/Target/PowerPC/PPCFrameInfo.h
@@ -0,0 +1,93 @@
+//===-- PPCFrameInfo.h - Define TargetFrameInfo for PowerPC -----*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef POWERPC_FRAMEINFO_H
+#define POWERPC_FRAMEINFO_H
+
+#include "PPC.h"
+#include "llvm/Target/TargetFrameInfo.h"
+#include "llvm/Target/TargetMachine.h"
+
+namespace llvm {
+
+class PPCFrameInfo: public TargetFrameInfo {
+ const TargetMachine &TM;
+
+public:
+ PPCFrameInfo(const TargetMachine &tm, bool LP64)
+ : TargetFrameInfo(TargetFrameInfo::StackGrowsDown, 16, 0), TM(tm) {
+ }
+
+ /// getReturnSaveOffset - Return the previous frame offset to save the
+ /// return address.
+ static unsigned getReturnSaveOffset(bool LP64, bool isMacho) {
+ if (isMacho)
+ return LP64 ? 16 : 8;
+ // For ELF 32 ABI:
+ return 4;
+ }
+
+ /// getFramePointerSaveOffset - Return the previous frame offset to save the
+ /// frame pointer.
+ static unsigned getFramePointerSaveOffset(bool LP64, bool isMacho) {
+ // For MachO ABI:
+ // Use the TOC save slot in the PowerPC linkage area for saving the frame
+ // pointer (if needed.) LLVM does not generate code that uses the TOC (R2
+ // is treated as a caller saved register.)
+ if (isMacho)
+ return LP64 ? 40 : 20;
+
+ // For ELF 32 ABI:
+ // Save it right before the link register
+ return -4U;
+ }
+
+ /// getLinkageSize - Return the size of the PowerPC ABI linkage area.
+ ///
+ static unsigned getLinkageSize(bool LP64, bool isMacho) {
+ if (isMacho)
+ return 6 * (LP64 ? 8 : 4);
+
+ // For ELF 32 ABI:
+ return 8;
+ }
+
+ /// getMinCallArgumentsSize - Return the size of the minium PowerPC ABI
+ /// argument area.
+ static unsigned getMinCallArgumentsSize(bool LP64, bool isMacho) {
+ // For Macho ABI:
+ // The prolog code of the callee may store up to 8 GPR argument registers to
+ // the stack, allowing va_start to index over them in memory if its varargs.
+ // Because we cannot tell if this is needed on the caller side, we have to
+ // conservatively assume that it is needed. As such, make sure we have at
+ // least enough stack space for the caller to store the 8 GPRs.
+ if (isMacho)
+ return 8 * (LP64 ? 8 : 4);
+
+ // For ELF 32 ABI:
+ // There is no default stack allocated for the 8 first GPR arguments.
+ return 0;
+ }
+
+ /// getMinCallFrameSize - Return the minimum size a call frame can be using
+ /// the PowerPC ABI.
+ static unsigned getMinCallFrameSize(bool LP64, bool isMacho) {
+ // The call frame needs to be at least big enough for linkage and 8 args.
+ return getLinkageSize(LP64, isMacho) +
+ getMinCallArgumentsSize(LP64, isMacho);
+ }
+
+};
+
+} // End llvm namespace
+
+#endif