llvm dev - Dec 2015 - InstrStage, Interpretation of getUnits()

Here is the code
<https://github.com/llvm-mirror/llvm/blob/c68dcdb413079d92118839dbd835e125293f411a/include/llvm/MC/MCInstrItineraries.h#L75>
for InstrStage::getUnits()

/// \brief Returns the choice of FUs.
unsigned getUnits() const { return Units_; }

This method returns an integer. How does one interpret it? As far as I see
it it should tell me what resources are used by a given stage but I can't
figure out what a return value means. Would anyone care to help?

Thanks,

-- 
Rail Shafigulin
Software Engineer
Esencia Technologies
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Hi Rail,

This is a bitfield, each bit represents one functional unit. Unit 0 
would be the LSB (1 << 0), unit 1 one bit above LSB (1 << 1),  and
so on
until unit N (1 << N). For example a return value of 9 means that units 
0 and 3 are used.

Cheers,
Pierre-Andre

On 04/12/15 22:20, Rail Shafigulin via llvm-dev wrote:
> Here is the code 
>
<https://github.com/llvm-mirror/llvm/blob/c68dcdb413079d92118839dbd835e125293f411a/include/llvm/MC/MCInstrItineraries.h#L75>
> for InstrStage::getUnits()
>
> /// \brief Returns the choice of FUs.
> unsigned getUnits() const { return Units_; }
>
> This method returns an integer. How does one interpret it? As far as I 
> see it it should tell me what resources are used by a given stage but 
> I can't figure out what a return value means. Would anyone care to
help?
>
> Thanks,
>
> -- 
> Rail Shafigulin
> Software Engineer
> Esencia Technologies
>
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
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On Fri, Dec 4, 2015 at 2:36 PM, Pierre-André Saulais <
pierre-andre at codeplay.com> wrote:
> Hi Rail,
>
> This is a bitfield, each bit represents one functional unit. Unit 0 would
> be the LSB (1 << 0), unit 1 one bit above LSB (1 << 1),  and so
on until
> unit N (1 << N). For example a return value of 9 means that units 0
and 3
> are used.
>
> Cheers,
> Pierre-Andre
>
>
> Thanks.
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