[cfe-commits] Atomic builtin patch

Chris Lattner clattner at apple.com
Mon May 5 17:00:51 PDT 2008

On May 5, 2008, at 3:06 PM, Mon P Wang wrote:

> Hi,
> I plan to checkin the following change to add support for sub, and,  
> or, xor, min and max (the latter two in both signed and unsigned  
> version) to clang.  In generates the llvm intrinsic  
> __sync_fetch_and_[opname].   Please let me know if you have any  
> issues or concerns.

Looks great to me, one minor change then please commit:

+static RValue EmitBinaryAtomic(CodeGenFunction& CFG,
+                               Intrinsic::ID Id, const CallExpr *E) {
+  Value *Args[2];
+  Args[0]= CFG.EmitScalarExpr(E->getArg(0));
+  Args[1] = CFG.EmitScalarExpr(E->getArg(1));
+  const llvm::Type *ResType = CFG.ConvertType(E->getType());
+  Value *AtomF = CFG.CGM.getIntrinsic(Id, &ResType, 1);
+  return RValue::get(CFG.Builder.CreateCall(AtomF, &Args[0],  

This can use Builder.CreateCall2(AtomF, x, y)

to avoid creating the temporary args array.


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