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Preserve noinline/debug callsite info when lowering Enzyme autodiff calls #2829

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Preserve noinline/debug callsite info when lowering Enzyme autodiff calls #2829

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Copilot May 16, 2026
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Preserve noinline/debug info on lowered Enzyme calls
Copilot May 16, 2026
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5 changes: 5 additions & 0 deletions enzyme/Enzyme/Enzyme.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1721,6 +1721,8 @@ class EnzymeBase {
CallInst *diffretc = cast<CallInst>(Builder.CreateCall(newFunc, args));
diffretc->setCallingConv(CallingConv);
diffretc->setDebugLoc(CI->getDebugLoc());
if (CI->hasFnAttr(Attribute::NoInline))
diffretc->addFnAttr(Attribute::NoInline);

for (auto &&[attr, ty] : byVal) {
diffretc->addParamAttr(
Expand Down Expand Up @@ -2554,6 +2556,9 @@ class EnzymeBase {
fn = B.CreatePointerCast(fn, getUnqual(FT));
}
auto Rep = B.CreateCall(FT, fn, Args);
Rep->setDebugLoc(CI->getDebugLoc());
if (CI->hasFnAttr(Attribute::NoInline))
Rep->addFnAttr(Attribute::NoInline);
Rep->addAttribute(AttributeList::FunctionIndex,
Attribute::get(Rep->getContext(), "enzyme_inactive"));
CI->replaceAllUsesWith(Rep);
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6 changes: 5 additions & 1 deletion enzyme/test/Enzyme/ReverseMode/undefalloc.ll
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Original file line number Diff line number Diff line change
Expand Up @@ -12,7 +12,7 @@ entry:
; Function Attrs: noinline nounwind uwtable
define dso_local double @dsumsquare(double %x) #0 {
entry:
%call = call fast double @__enzyme_autodiff(i8* bitcast (double (double)* @f to i8*), double %x)
%call = call fast noinline double @__enzyme_autodiff(i8* bitcast (double (double)* @f to i8*), double %x)
ret double %call
}

Expand All @@ -24,3 +24,7 @@ attributes #0 = { noinline nounwind uwtable }
; CHECK-NEXT: entry:
; CHECK-NEXT: ret { double } zeroinitializer
; CHECK-NEXT: }
; CHECK-LABEL: define dso_local double @dsumsquare(double %x)
; CHECK: %[[call:.+]] = call fast noinline { double } @diffef(double %x, double 1.000000e+00)
; CHECK-NEXT: %[[ret:.+]] = extractvalue { double } %[[call]], 0
; CHECK-NEXT: ret double %[[ret]]