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[Hexagon] Packetize function call arguments with tail call instructions

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On Hexagon is it legal to packetize the instructions setting up call
arguments with the call instruction itself. This was already done,
except for tail calls. Make sure tail calls are handled as well.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@275458 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Krzysztof Parzyszek 2016-07-14 19:30:55 +00:00
parent 7846f45617
commit 1a360b3be9
4 changed files with 35 additions and 1 deletions
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11
lib/Target/Hexagon/HexagonInstrInfo.cpp
View File

@ -2437,6 +2437,17 @@ bool HexagonInstrInfo::isSpillPredRegOp(const MachineInstr *MI) const {
}
bool HexagonInstrInfo::isTailCall(const MachineInstr *MI) const {
if (!MI->isBranch())
return false;
for (auto &Op : MI->operands())
if (Op.isGlobal() || Op.isSymbol())
return true;
return false;
}
// Returns true when SU has a timing class TC1.
bool HexagonInstrInfo::isTC1(const MachineInstr *MI) const {
unsigned SchedClass = MI->getDesc().getSchedClass();

1
lib/Target/Hexagon/HexagonInstrInfo.h
View File

@ -309,6 +309,7 @@ public:
bool isSignExtendingLoad(const MachineInstr &MI) const;
bool isSolo(const MachineInstr* MI) const;
bool isSpillPredRegOp(const MachineInstr *MI) const;
bool isTailCall(const MachineInstr *MI) const;
bool isTC1(const MachineInstr *MI) const;
bool isTC2(const MachineInstr *MI) const;
bool isTC2Early(const MachineInstr *MI) const;

2
lib/Target/Hexagon/HexagonVLIWPacketizer.cpp
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@ -1248,7 +1248,7 @@ bool HexagonPacketizerList::isLegalToPacketizeTogether(SUnit *SUI, SUnit *SUJ) {
RC = HRI->getMinimalPhysRegClass(DepReg);
}
if (I->isCall() || I->isReturn()) {
if (I->isCall() || I->isReturn() || HII->isTailCall(I)) {
if (!isRegDependence(DepType))
continue;
if (!isCallDependent(I, DepType, SUJ->Succs[i].getReg()))

22
test/CodeGen/Hexagon/packetize-tailcall-arg.ll Normal file
View File

@ -0,0 +1,22 @@
; RUN: llc -march=hexagon < %s | FileCheck %s
; There should only be one packet:
; {
; jump free
; r0 = memw(r0 + #-4)
; }
;
; CHECK: {
; CHECK-NOT: {
define void @fred(i8* %p) nounwind {
entry:
%arrayidx = getelementptr inbounds i8, i8* %p, i32 -4
%t0 = bitcast i8* %arrayidx to i8**
%t1 = load i8*, i8** %t0, align 4
tail call void @free(i8* %t1)
ret void
}
; Function Attrs: nounwind
declare void @free(i8* nocapture) nounwind