Change MRegisterDesc::AliasSet, TargetInstrDescriptor::ImplicitDefs
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
diff --git a/lib/CodeGen/RegAllocSimple.cpp b/lib/CodeGen/RegAllocSimple.cpp
index 57d678b..dbf731e 100644
--- a/lib/CodeGen/RegAllocSimple.cpp
+++ b/lib/CodeGen/RegAllocSimple.cpp
@@ -153,13 +153,13 @@
// 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) {