================
@@ -6277,6 +6277,21 @@ RValue CodeGenFunction::EmitCall(const CGFunctionInfo 
&CallInfo,
     pushDestroy(QualType::DK_nontrivial_c_struct, Ret.getAggregateAddress(),
                 RetTy);
 
+  if (CalleeDecl) {
+    // Generate function declaration DISuprogram in order to be used
+    // in debug info about call sites.
+    if (CGDebugInfo *DI = getDebugInfo()) {
+      CodeGenFunction CalleeCGF(CGM);
----------------
jryans wrote:

Correct, call site emission is skipped for O0, so I agree that in that light, 
the O0 regressions warrant further investigation.

Currently the check for O0 happens after collecting the function arguments, so 
I'll try repeating the O0 check a bit earlier so that we hopefully abort 
earlier and do less work.

https://github.com/llvm/llvm-project/pull/166202
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