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Fix lowering of DYNAMIC_STACKALLOC nodes. 

llvm-svn: 132030
This commit is contained in:
Akira Hatanaka 2011-05-25 02:20:00 +00:00
parent fc1e7ce850
commit aac670c1c8
2 changed files with 51 additions and 2 deletions
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22
llvm/lib/Target/Mips/MipsISelLowering.cpp
View File

@ -692,6 +692,13 @@ LowerFP_TO_SINT(SDValue Op, SelectionDAG &DAG) const
SDValue MipsTargetLowering::
LowerDYNAMIC_STACKALLOC(SDValue Op, SelectionDAG &DAG) const
{
unsigned StackAlignment =
getTargetMachine().getFrameLowering()->getStackAlignment();
assert(StackAlignment >=
cast<ConstantSDNode>(Op.getOperand(2).getNode())->getZExtValue() &&
"Cannot lower if the alignment of the allocated space is larger than \
that of the stack.");
SDValue Chain = Op.getOperand(0);
SDValue Size = Op.getOperand(1);
DebugLoc dl = Op.getDebugLoc();
@ -705,11 +712,22 @@ LowerDYNAMIC_STACKALLOC(SDValue Op, SelectionDAG &DAG) const
// The Sub result contains the new stack start address, so it
// must be placed in the stack pointer register.
Chain = DAG.getCopyToReg(StackPointer.getValue(1), dl, Mips::SP, Sub);
Chain = DAG.getCopyToReg(StackPointer.getValue(1), dl, Mips::SP, Sub,
SDValue());
SDValue NewSP = DAG.getCopyFromReg(Chain, dl, Mips::SP, MVT::i32,
Chain.getValue(1));
// Align the allocated space.
MachineFunction &MF = DAG.getMachineFunction();
MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
unsigned SPOffset = (MipsFI->getMaxCallFrameSize() + StackAlignment - 1) /
StackAlignment * StackAlignment;
SDValue AllocPtr = DAG.getNode(ISD::ADD, dl, MVT::i32, NewSP,
DAG.getConstant(SPOffset, MVT::i32));
// This node always has two return values: a new stack pointer
// value and a chain
SDValue Ops[2] = { Sub, Chain };
SDValue Ops[2] = { AllocPtr, NewSP.getValue(1) };
return DAG.getMergeValues(Ops, 2, dl);
}

31
llvm/test/CodeGen/Mips/alloca.ll Normal file
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@ -0,0 +1,31 @@
; RUN: llc -march=mipsel -mcpu=4ke < %s | FileCheck %s
define i32 @twoalloca(i32 %size) nounwind {
entry:
; CHECK: subu $[[T0:[0-9]+]], $sp, $[[SZ:[0-9]+]]
; CHECK: addu $sp, $zero, $[[T0]]
; CHECK: addu $[[SP1:[0-9]+]], $zero, $sp
; CHECK: subu $[[T1:[0-9]+]], $sp, $[[SZ]]
; CHECK: addu $sp, $zero, $[[T1]]
; CHECK: addu $[[SP2:[0-9]+]], $zero, $sp
; CHECK: lw $25, %call16(foo)($gp)
; CHECK: addiu $4, $[[SP1]], 24
; CHECK: jalr $25
; CHECK: lw $25, %call16(foo)($gp)
; CHECK: addiu $4, $[[SP2]], 24
; CHECK: jalr $25
%tmp1 = alloca i8, i32 %size, align 4
%add.ptr = getelementptr inbounds i8* %tmp1, i32 5
store i8 97, i8* %add.ptr, align 1
%tmp4 = alloca i8, i32 %size, align 4
call void @foo2(double 1.000000e+00, double 2.000000e+00, i32 3) nounwind
%call = call i32 @foo(i8* %tmp1) nounwind
%call7 = call i32 @foo(i8* %tmp4) nounwind
%add = add nsw i32 %call7, %call
ret i32 %add
}
declare void @foo2(double, double, i32)
declare i32 @foo(i8*)