[llvm-dev] [RFC] Moving llvm.dbg.value out of the instruction stream (original) (raw)
Adrian Prantl via llvm-dev llvm-dev at lists.llvm.org
Tue Oct 23 09:53:07 PDT 2018
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[resending with a bugfix s/x/y/ in my example]
We still have to support constant dbg.values that need to be at a specific point in the instruction stream and don't refer to any SSA value. For example, we can still have code like this:
int x = foo(); int y = 42; bar(); y = x; baz();
that might lower into IR like
%x = call i32 @foo() call void @llvm.dbg.value(i32 %x, DIVariable("x"), ...) call void @llvm.dbg.value(i32 42, DIVariable("y"), ...) call void @bar() call void @llvm.dbg.value(i32 %x, DIVariable("y"), ...) ; %x is not materialized here, and we also can't hoist this. call void @foo()
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