Make visitAllocaInst() look more like its X86 counterpart.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14229 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/Sparc/InstSelectSimple.cpp b/lib/Target/Sparc/InstSelectSimple.cpp
index e86e25b9..1bfd4da 100644
--- a/lib/Target/Sparc/InstSelectSimple.cpp
+++ b/lib/Target/Sparc/InstSelectSimple.cpp
@@ -905,16 +905,24 @@
unsigned TmpReg1 = makeAnotherReg (Type::UIntTy);
unsigned TmpReg2 = makeAnotherReg (Type::UIntTy);
unsigned StackAdjReg = makeAnotherReg (Type::UIntTy);
- unsigned DestReg = getReg (I);
// StackAdjReg = (ArraySize * TySize) rounded up to nearest doubleword boundary
BuildMI (BB, V8::UMULrr, 2, TmpReg1).addReg (ArraySizeReg).addReg (TySizeReg);
+
// Round up TmpReg1 to nearest doubleword boundary:
BuildMI (BB, V8::ADDri, 2, TmpReg2).addReg (TmpReg1).addSImm (7);
BuildMI (BB, V8::ANDri, 2, StackAdjReg).addReg (TmpReg2).addSImm (-8);
- // Adjust stack, push pointer past trap frame space, put result in DestReg
+
+ // Subtract size from stack pointer, thereby allocating some space.
BuildMI (BB, V8::SUBrr, 2, V8::SP).addReg (V8::SP).addReg (StackAdjReg);
- BuildMI (BB, V8::ADDri, 2, DestReg).addReg (V8::SP).addSImm (96);
+
+ // Put a pointer to the space into the result register, by copying
+ // the stack pointer.
+ BuildMI (BB, V8::ADDri, 2, getReg(I)).addReg (V8::SP).addSImm (96);
+
+ // Inform the Frame Information that we have just allocated a variable-sized
+ // object.
+ F->getFrameInfo()->CreateVariableSizedObject();
}
/// LowerUnknownIntrinsicFunctionCalls - This performs a prepass over the