Implement -disable-non-leaf-fp-elim which disable frame pointer elimination
optimization for non-leaf functions. This will be hooked up to gcc's
-momit-leaf-frame-pointer option. rdar://7886181
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101984 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/TargetMachine.cpp b/lib/Target/TargetMachine.cpp
index 871b148..d90755a 100644
--- a/lib/Target/TargetMachine.cpp
+++ b/lib/Target/TargetMachine.cpp
@@ -11,6 +11,8 @@
//
//===----------------------------------------------------------------------===//
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
@@ -25,6 +27,7 @@
bool LessPreciseFPMADOption;
bool PrintMachineCode;
bool NoFramePointerElim;
+ bool NoFramePointerElimNonLeaf;
bool NoExcessFPPrecision;
bool UnsafeFPMath;
bool FiniteOnlyFPMathOption;
@@ -58,6 +61,11 @@
cl::location(NoFramePointerElim),
cl::init(false));
static cl::opt<bool, true>
+DisableFPElimNonLeaf("disable-non-leaf-fp-elim",
+ cl::desc("Disable frame pointer elimination optimization for non-leaf funcs"),
+ cl::location(NoFramePointerElimNonLeaf),
+ cl::init(false));
+static cl::opt<bool, true>
DisableExcessPrecision("disable-excess-fp-precision",
cl::desc("Disable optimizations that may increase FP precision"),
cl::location(NoExcessFPPrecision),
@@ -268,6 +276,18 @@
}
namespace llvm {
+ /// DisableFramePointerElim - This returns true if frame pointer elimination
+ /// optimization should be disabled for the given machine function.
+ bool DisableFramePointerElim(const MachineFunction &MF) {
+ if (NoFramePointerElim)
+ return true;
+ if (NoFramePointerElimNonLeaf) {
+ const MachineFrameInfo *MFI = MF.getFrameInfo();
+ return MFI->hasCalls();
+ }
+ return false;
+ }
+
/// LessPreciseFPMAD - This flag return true when -enable-fp-mad option
/// is specified on the command line. When this flag is off(default), the
/// code generator is not allowed to generate mad (multiply add) if the