fix debug value being erase too early in case of forward mode (rust-lang#330)

tgymnich · web-flow · commit bea9d393227b · 2021-09-21T08:36:03.000+02:00
diff --git a/enzyme/Enzyme/AdjointGenerator.h b/enzyme/Enzyme/AdjointGenerator.h
@@ -2295,13 +2295,13 @@ class AdjointGenerator
       return;
     }
 
-    eraseIfUnused(II);
     SmallVector<Value *, 2> orig_ops(II.getNumOperands());
 
     for (unsigned i = 0; i < II.getNumOperands(); ++i) {
       orig_ops[i] = II.getOperand(i);
     }
     handleAdjointForIntrinsic(II.getIntrinsicID(), II, orig_ops);
+    eraseIfUnused(II);
   }
 
   void handleAdjointForIntrinsic(Intrinsic::ID ID, llvm::Instruction &I,

Original file line number	Diff line number	Diff line change
`@@ -2295,13 +2295,13 @@ class AdjointGenerator`
`2295`	`2295`	`return;`
`2296`	`2296`	`}`
`2297`	`2297`
`2298`		`- eraseIfUnused(II);`
`2299`	`2298`	`SmallVector<Value *, 2> orig_ops(II.getNumOperands());`
`2300`	`2299`
`2301`	`2300`	`for (unsigned i = 0; i < II.getNumOperands(); ++i) {`
`2302`	`2301`	`orig_ops[i] = II.getOperand(i);`
`2303`	`2302`	`}`
`2304`	`2303`	`handleAdjointForIntrinsic(II.getIntrinsicID(), II, orig_ops);`
	`2304`	`+ eraseIfUnused(II);`
`2305`	`2305`	`}`
`2306`	`2306`
`2307`	`2307`	`void handleAdjointForIntrinsic(Intrinsic::ID ID, llvm::Instruction &I,`