Eliminate data relocations by using NULL instead of global empty list.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29250 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/RegAllocSimple.cpp b/lib/CodeGen/RegAllocSimple.cpp
index 5d94f0a..c6faead 100644
--- a/lib/CodeGen/RegAllocSimple.cpp
+++ b/lib/CodeGen/RegAllocSimple.cpp
@@ -166,12 +166,16 @@
unsigned Opcode = MI->getOpcode();
const TargetInstrDescriptor &Desc = TM->getInstrInfo()->get(Opcode);
const unsigned *Regs;
- for (Regs = Desc.ImplicitUses; *Regs; ++Regs)
- RegsUsed[*Regs] = true;
+ if (Desc.ImplicitUses) {
+ for (Regs = Desc.ImplicitUses; *Regs; ++Regs)
+ RegsUsed[*Regs] = true;
+ }
- for (Regs = Desc.ImplicitDefs; *Regs; ++Regs) {
- RegsUsed[*Regs] = true;
- PhysRegsEverUsed[*Regs] = true;
+ if (Desc.ImplicitDefs) {
+ for (Regs = Desc.ImplicitDefs; *Regs; ++Regs) {
+ RegsUsed[*Regs] = true;
+ PhysRegsEverUsed[*Regs] = true;
+ }
}
// Loop over uses, move from memory into registers.