[llvm] r233583 - [NVPTX] Associate a minimum PTX version for each SM architecture

[Artem Belevich]

Hi,

On Mon, Mar 30, 2015 at 12:30 PM, Justin Holewinski <jholewinski at nvidia.com>
wrote:

> Author: jholewinski
> Date: Mon Mar 30 14:30:55 2015
> New Revision: 233583
>
> URL: http://llvm.org/viewvc/llvm-project?rev=233583&view=rev
> Log:
> [NVPTX] Associate a minimum PTX version for each SM architecture
>
> ...

> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/NVPTX/NVPTX.td?rev=233583&r1=233582&r2=233583&view=diff
>
> ==============================================================================
> --- llvm/trunk/lib/Target/NVPTX/NVPTX.td (original)
> +++ llvm/trunk/lib/Target/NVPTX/NVPTX.td Mon Mar 30 14:30:55 2015
> @@ -46,10 +46,6 @@ def SM53 : SubtargetFeature<"sm_53", "Sm
>                              "Target SM 5.3">;
>
>  // PTX Versions
> -def PTX30 : SubtargetFeature<"ptx30", "PTXVersion", "30",
> -                             "Use PTX version 3.0">;
> -def PTX31 : SubtargetFeature<"ptx31", "PTXVersion", "31",
> -                             "Use PTX version 3.1">;
>  def PTX32 : SubtargetFeature<"ptx32", "PTXVersion", "32",
>                               "Use PTX version 3.2">;
>  def PTX40 : SubtargetFeature<"ptx40", "PTXVersion", "40",
> @@ -69,12 +65,12 @@ class Proc<string Name, list<SubtargetFe
>  def : Proc<"sm_20", [SM20]>;
>  def : Proc<"sm_21", [SM21]>;
>  def : Proc<"sm_30", [SM30]>;
> -def : Proc<"sm_32", [SM32]>;
> +def : Proc<"sm_32", [SM32, PTX40]>;
>  def : Proc<"sm_35", [SM35]>;
>

Does it mean that SM35/SM37 would still be using PTX3.2?

libdevice.compute_35.10.bc that ships with CUDA-7.0 uses
"rsqrt.approx.ftz.f64". That instruction was added in PTX4.0 which suggests
that SM35/37 may have to bumped to PTX 4.0, too.

--Artem
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