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jalr should use t9 ($25) for indirect calls regardless of the relocation model

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specified.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146229 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Akira Hatanaka 2011-12-09 01:45:12 +00:00
parent f5b9a74f0a
commit 0dca9456c5
2 changed files with 16 additions and 4 deletions
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12
lib/Target/Mips/MipsISelLowering.cpp
View File

@ -2338,7 +2338,7 @@ MipsTargetLowering::LowerCall(SDValue InChain, SDValue Callee,
// node so that legalize doesn't hack it.
unsigned char OpFlag;
bool IsPICCall = (IsN64 || IsPIC); // true if calls are translated to jalr $25
bool LoadSymAddr = false;
bool GlobalOrExternal = false;
SDValue CalleeLo;
if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
@ -2355,7 +2355,7 @@ MipsTargetLowering::LowerCall(SDValue InChain, SDValue Callee,
getPointerTy(), 0, OpFlag);
}
LoadSymAddr = true;
GlobalOrExternal = true;
}
else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee)) {
if (IsN64 || (!IsO32 && IsPIC))
@ -2366,14 +2366,14 @@ MipsTargetLowering::LowerCall(SDValue InChain, SDValue Callee,
OpFlag = MipsII::MO_GOT_CALL;
Callee = DAG.getTargetExternalSymbol(S->getSymbol(),
getPointerTy(), OpFlag);
LoadSymAddr = true;
GlobalOrExternal = true;
}
SDValue InFlag;
// Create nodes that load address of callee and copy it to T9
if (IsPICCall) {
if (LoadSymAddr) {
if (GlobalOrExternal) {
// Load callee address
Callee = DAG.getNode(MipsISD::WrapperPIC, dl, getPointerTy(), Callee);
SDValue LoadValue = DAG.getLoad(getPointerTy(), dl, DAG.getEntryNode(),
@ -2387,7 +2387,11 @@ MipsTargetLowering::LowerCall(SDValue InChain, SDValue Callee,
} else
Callee = LoadValue;
}
}
// T9 should contain the address of the callee function if
// -reloction-model=pic or it is an indirect call.
if (IsPICCall || !GlobalOrExternal) {
// copy to T9
unsigned T9Reg = IsN64 ? Mips::T9_64 : Mips::T9;
Chain = DAG.getCopyToReg(Chain, dl, T9Reg, Callee, SDValue(0, 0));

8
test/CodeGen/Mips/indirectcall.ll Normal file
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@ -0,0 +1,8 @@
; RUN: llc < %s -march=mipsel -relocation-model=static | FileCheck %s
define void @foo0(void (i32)* nocapture %f1) nounwind {
entry:
; CHECK: jalr $25
tail call void %f1(i32 13) nounwind
ret void
}