================
@@ -163,20 +206,90 @@ static void EmitRuntimeFunction(MCStreamer &streamer,
context), 4);
}
+static std::optional<int64_t>
+GetOptionalAbsDifference(const MCAssembler &Assembler, const MCSymbol *LHS,
+ const MCSymbol *RHS) {
+ MCContext &Context = Assembler.getContext();
+ const MCExpr *Diff =
+ MCBinaryExpr::createSub(MCSymbolRefExpr::create(LHS, Context),
+ MCSymbolRefExpr::create(RHS, Context), Context);
+ // It should normally be possible to calculate the length of a function
+ // at this point, but it might not be possible in the presence of certain
+ // unusual constructs, like an inline asm with an alignment directive.
----------------
dpaoliello wrote:
This is actually pre-existing code that I moved earlier since I needed to call
it in a different function.
It's definitely caused issues for me: you'll note that I only use this to
measure the size of an epilog, so it's always measuring within the same block
across a known set of instructions.
For the distance between an epilog and the end of the function I had to create
a custom fixup for exactly the reason that you mention.
https://github.com/llvm/llvm-project/pull/129142
_______________________________________________
cfe-commits mailing list
cfe-commits@lists.llvm.org
https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
