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Fix an X86-64 abi bug. We now compile: 

void foo(short);
void bar(unsigned short A) {
  foo(A);
}

into:

_bar:
        subq $8, %rsp
        movswl %di, %edi
        call _foo
        addq $8, %rsp
        ret

instead of:

_bar:
        subq $8, %rsp
        call _foo
        addq $8, %rsp
        ret

Testcase here: test/CodeGen/X86/x86-64-shortint.ll

llvm-svn: 34615
This commit is contained in:
Chris Lattner 2007-02-25 23:10:46 +00:00
parent c864f6a786
commit 8924332e22
1 changed files with 13 additions and 10 deletions
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23
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -1301,12 +1301,6 @@ X86TargetLowering::LowerX86_64CCCCallTo(SDOperand Op, SelectionDAG &DAG,
unsigned NumIntRegs = 0; // Int regs used for parameter passing.
unsigned NumXMMRegs = 0; // XMM regs used for parameter passing.
static const unsigned GPR8ArgRegs[] = {
X86::DIL, X86::SIL, X86::DL, X86::CL, X86::R8B, X86::R9B
};
static const unsigned GPR16ArgRegs[] = {
X86::DI, X86::SI, X86::DX, X86::CX, X86::R8W, X86::R9W
};
static const unsigned GPR32ArgRegs[] = {
X86::EDI, X86::ESI, X86::EDX, X86::ECX, X86::R8D, X86::R9D
};
@ -1366,6 +1360,15 @@ X86TargetLowering::LowerX86_64CCCCallTo(SDOperand Op, SelectionDAG &DAG,
for (unsigned i = 0; i != NumOps; ++i) {
SDOperand Arg = Op.getOperand(5+2*i);
MVT::ValueType ArgVT = Arg.getValueType();
unsigned ArgFlags =cast<ConstantSDNode>(Op.getOperand(5+2*i+1))->getValue();
if (MVT::isInteger(ArgVT) && ArgVT < MVT::i32) {
// Promote the integer to 32 bits. If the input type is signed use a
// sign extend, otherwise use a zero extend.
unsigned ExtOpc = (ArgFlags & 1) ? ISD::SIGN_EXTEND : ISD::ZERO_EXTEND;
Arg = DAG.getNode(ExtOpc, MVT::i32, Arg);
ArgVT = MVT::i32;
}
switch (ArgVT) {
default: assert(0 && "Unexpected ValueType for argument!");
@ -1376,10 +1379,10 @@ X86TargetLowering::LowerX86_64CCCCallTo(SDOperand Op, SelectionDAG &DAG,
if (NumIntRegs < 6) {
unsigned Reg = 0;
switch (ArgVT) {
default: break;
case MVT::i8: Reg = GPR8ArgRegs[NumIntRegs]; break;
case MVT::i16: Reg = GPR16ArgRegs[NumIntRegs]; break;
case MVT::i32: Reg = GPR32ArgRegs[NumIntRegs]; break;
default: assert(0 && "Unknown integer size!");
case MVT::i32:
Reg = GPR32ArgRegs[NumIntRegs];
break;
case MVT::i64: Reg = GPR64ArgRegs[NumIntRegs]; break;
}
RegsToPass.push_back(std::make_pair(Reg, Arg));