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[Mips] Silencing warnings in instruction info (NFC)

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isORCopyInst and isReadOrWriteToDSPReg functions were producing warning
that some statements my fall through.

Patch by Nikola Prica.

Differential Revision: https://reviews.llvm.org/D47876

llvm-svn: 334194
This commit is contained in:
Petar Jovanovic 2018-06-07 13:06:06 +00:00
parent 2daa6b3f4d
commit dca3ba34fb
1 changed files with 18 additions and 12 deletions
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30
lib/Target/Mips/MipsSEInstrInfo.cpp
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@ -181,31 +181,37 @@ void MipsSEInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
static bool isORCopyInst(const MachineInstr &MI) {
switch (MI.getOpcode()) {
default:
break;
case Mips::OR_MM:
case Mips::OR:
if (MI.getOperand(2).getReg() == Mips::ZERO)
return true;
break;
case Mips::OR64:
if (MI.getOperand(2).getReg() == Mips::ZERO_64)
return true;
default:
return false;
break;
}
return false;
}
/// If @MI is WRDSP/RRDSP instruction return true with @isWrite set to true
/// if it is WRDSP instruction.
static bool isReadOrWritToDSPReg(const MachineInstr &MI, bool &isWrite) {
static bool isReadOrWriteToDSPReg(const MachineInstr &MI, bool &isWrite) {
switch (MI.getOpcode()) {
case Mips::WRDSP:
case Mips::WRDSP_MM:
isWrite = true;
case Mips::RDDSP:
case Mips::RDDSP_MM:
return true;
default:
return false;
default:
return false;
case Mips::WRDSP:
case Mips::WRDSP_MM:
isWrite = true;
break;
case Mips::RDDSP:
case Mips::RDDSP_MM:
isWrite = false;
break;
}
return true;
}
/// We check for the common case of 'or', as it's MIPS' preferred instruction
@ -217,7 +223,7 @@ bool MipsSEInstrInfo::isCopyInstr(const MachineInstr &MI,
bool isDSPControlWrite = false;
// Condition is made to match the creation of WRDSP/RDDSP copy instruction
// from copyPhysReg function.
if (isReadOrWritToDSPReg(MI, isDSPControlWrite)) {
if (isReadOrWriteToDSPReg(MI, isDSPControlWrite)) {
if (!MI.getOperand(1).isImm() || MI.getOperand(1).getImm() != (1<<4))
return false;
else if (isDSPControlWrite) {