[llvm-commits] [llvm] r117667 - in /llvm/trunk: include/llvm/ include/llvm/CodeGen/ include/llvm/Target/ lib/CodeGen/ lib/CodeGen/SelectionDAG/ lib/Target/ARM/ lib/Target/Alpha/ lib/Target/Blackfin/ lib/Target/CBackend/ lib/Target/CellSPU/ lib/Ta

[Nick Lewycky]

On 29 October 2010 15:47, John Thompson
<john.thompson.jtsoftware at gmail.com>wrote:

> If stack space is of concern, I think it would be safer to go back to
> vector.  Using vector will mean more heap allocations, but the overall
> memory usage would probably be less.
>
> How do you measure the stack space (i.e. is there a simple way besides
> inspection in the debugger)?  I'd like to measure both.
>

gcc -Wframe-larger-than=16384 will warn of functions using more than 16k of
stack space, on gcc 4.4.
http://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html

Nick


>  -John
> On Fri, Oct 29, 2010 at 2:22 PM, Dale Johannesen <dalej at apple.com> wrote:
>
>> Interesting.  It's true very small sizes are most common for these
>> vectors, but I wouldn't have expected the overhead to be that significant.
>>  Perhaps try lowering all the fixed allocations to 4?
>>
>>  On Oct 29, 2010, at 2:10 PMPDT, Nick Lewycky wrote:
>>
>> On 29 October 2010 10:29, John Thompson <
>> John.Thompson.JTSoftware at gmail.com> wrote:
>>
>>> Author: jtsoftware
>>> Date: Fri Oct 29 12:29:13 2010
>>> New Revision: 117667
>>>
>>> URL: http://llvm.org/viewvc/llvm-project?rev=117667&view=rev
>>> Log:
>>> Inline asm multiple alternative constraints development phase 2 -
>>> improved basic logic, added initial platform support.
>>>
>>
>> This change makes SelectionDAGBuilder::visitInlineAsm use up 30k of stack
>> space, largely due to the switch from std::vector to SmallVector. Please
>> fix!
>>
>>
>>
>
>
> --
> John Thompson
> John.Thompson.JTSoftware at gmail.com
>
>
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