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[Hexagon] Avoid register dependencies on indirect branches in packetizer

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Do not packetize the instruction setting the branch address with the
indirect branch itself.

llvm-svn: 279324
This commit is contained in:
Krzysztof Parzyszek 2016-08-19 21:07:35 +00:00
parent 3486149e3b
commit 0c8510db02
1 changed files with 8 additions and 7 deletions
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15
lib/Target/Hexagon/HexagonVLIWPacketizer.cpp
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@ -283,11 +283,18 @@ bool HexagonPacketizerList::isCallDependent(const MachineInstr &MI,
// Assumes that the first operand of the CALLr is the function address.
if (HII->isIndirectCall(MI) && (DepType == SDep::Data)) {
MachineOperand MO = MI.getOperand(0);
const MachineOperand MO = MI.getOperand(0);
if (MO.isReg() && MO.isUse() && (MO.getReg() == DepReg))
return true;
}
if (HII->isJumpR(MI)) {
const MachineOperand &MO = HII->isPredicated(MI) ? MI.getOperand(1)
: MI.getOperand(0);
assert(MO.isReg() && MO.isUse());
if (MO.getReg() == DepReg)
return true;
}
return false;
}
@ -1293,12 +1300,6 @@ bool HexagonPacketizerList::isLegalToPacketizeTogether(SUnit *SUI, SUnit *SUJ) {
// dealloc return unless we have dependencies on the explicit uses
// of the registers used by jumpr (like r31) or dealloc return
// (like r29 or r30).
//
// TODO: Currently, jumpr is handling only return of r31. So, the
// following logic (specificaly isCallDependent) is working fine.
// We need to enable jumpr for register other than r31 and then,
// we need to rework the last part, where it handles indirect call
// of that (isCallDependent) function. Bug 6216 is opened for this.
unsigned DepReg = 0;
const TargetRegisterClass *RC = nullptr;
if (DepType == SDep::Data) {