<div dir="ltr"><div class="gmail_default" style>On Mon, Jan 14, 2013 at 2:21 PM, Krzysztof Parzyszek <span dir="ltr"><<a href="mailto:kparzysz@codeaurora.org" target="_blank" class="cremed">kparzysz@codeaurora.org</a>></span> wrote:<br>
</div><div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">On 1/14/2013 3:23 PM, Chandler Carruth wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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This is a great question. My plan would be: inlining doesn't impact the<br>
attributes. The inliner will be free to look at both the caller and the<br>
callee's attributes to choose the best inlining decision.<br>
</blockquote>
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The problem is not so much with the inlining decisions, as much as it is with keeping the attributes in the inlined code. If you have a function foo, which is to be compiled at O2, and it's called from bar, whose optimization level is O3, then you can take the O2 code and insert it in the middle of the O3 code. The problem is that in certain cases, compiling at O3 is not acceptable, so we can't just "upgrade" the opt level from O2 to O3.</blockquote>
<div><br></div><div style>OK, I hadn't realized that wasn't clear.</div><div style><br></div><div style>I absolutely think that when a function has an optimization attribute, that applies to the code in the function and all code inlined into the function. If foo calls bar then foo's optimization level should be valid for bar, or bar should be marked noinline, or something else.</div>
<div style><br></div><div style>I'm dubious about any kind of built-in way of controlling this because there shouldn't (in a perfect world) be any code which "isn't valid" at one optimization level, and if this is only about intent, then *if* the inliner made the right decision to inline, then the intent of the caller should apply to the inlined code. If it wouldn't apply, the inliner made the wrong decision.</div>
<div style><br></div><div style>-Chandler </div></div></div></div>