================
@@ -1353,6 +1353,19 @@ void CodeGenFunction::EmitLifetimeEnd(llvm::Value *Size,
llvm::Value *Addr) {
C->setDoesNotThrow();
}
+void CodeGenFunction::EmitFakeUse(Address Addr) {
+ // We do not emit a fake use if we want to apply optnone to this function,
+ // even if we might not apply it anyway due to minsize or similar attributes.
+ if (!CGM.getCodeGenOpts().DisableO0ImplyOptNone &&
+ CGM.getCodeGenOpts().OptimizationLevel == 0)
+ return;
----------------
pogo59 wrote:
There's no value to enabling `-fextend-lifetimes` at O0, because we only emit
stack-home locations at O0, which are valid for the entire function. However, I
don't remember whether that decision is a blanket decision based on opt level
or per-function based on optnone. If it's based on opt level, then adding
fake-uses to an optnone function (at O1 and up) might actually be the right
thing to do.
https://github.com/llvm/llvm-project/pull/110102
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