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Change MRegisterDesc::AliasSet, TargetInstrDescriptor::ImplicitDefs

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and TargetInstrDescriptor::ImplicitUses to always point to a null
terminated array and never be null. So there is no need to check for
pointer validity when iterating over those sets. Code that looked
like:

if (const unsigned* AS = TID.ImplicitDefs) {
  for (int i = 0; AS[i]; ++i) {
    // use AS[i]
  }
}

was changed to:

for (const unsigned* AS = TID.ImplicitDefs; *AS; ++AS) {
  // use *AS
}


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8960 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alkis Evlogimenos
2003-10-08 05:20:08 +00:00
parent 6b8b22585c
commit 73ff5120eb
6 changed files with 64 additions and 48 deletions
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12
lib/CodeGen/RegAllocSimple.cpp
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@ -153,13 +153,13 @@ void RegAllocSimple::AllocateBasicBlock(MachineBasicBlock &MBB) {
// are used by the instruction (including implicit uses)
unsigned Opcode = MI->getOpcode();
const TargetInstrDescriptor &Desc = TM->getInstrInfo().get(Opcode);
if (const unsigned *Regs = Desc.ImplicitUses)
while (*Regs)
RegsUsed[*Regs++] = true;
const unsigned *Regs = Desc.ImplicitUses;
while (*Regs)
RegsUsed[*Regs++] = true;
if (const unsigned *Regs = Desc.ImplicitDefs)
while (*Regs)
RegsUsed[*Regs++] = true;
Regs = Desc.ImplicitDefs;
while (*Regs)
RegsUsed[*Regs++] = true;
// Loop over uses, move from memory into registers
for (int i = MI->getNumOperands() - 1; i >= 0; --i) {