[LLVMdev] Disabling certain optimizations at -O1?

[Evgeniy Stepanov]

Renato,

I'm not sure I follow. By #pragma, do you mean a C-level thing? By
table of flags, some hypothetical place where the proposed
"Simple|Speed|Space|Aggressive" setting lives, accessible by IR
passes? Sounds like what Philip needs is a more specific
PreserveStackTraces setting in the same place, that's on by default at
-O1, and overridable by some find of -fpreserve-stack-traces Clang
command-line flag.


On Tue, Dec 3, 2013 at 2:42 AM, Renato Golin <renato.golin at linaro.org> wrote:
> On 2 December 2013 20:12, Philip Reames <listmail at philipreames.com> wrote:
>> Would it make sense to separate our a flag for preserving full and exactly
>> stack traces?  Using -O1 is one option, but it would be nice to move beyond
>> -O1 with reasonable confidence that stack traces would be preserved.  Would
>> others be interested in such a feature?
>
> I can't say I'm interested in that, but it shouldn't be too different
> than a module-level #pragma optimize (no_this, no_that), which could
> be supported if the table of flags has a rich enough semantics.
>
> cheers,
> --renato
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