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Introduce Subgroup Operations Extension #954

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Introduce Subgroup Operations Extension #954

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57c51e6
Update index.bs
mehmetoguzderin Jul 24, 2020
30265b0
Update index.bs
mehmetoguzderin Jul 24, 2020
fb72312
Update index.bs
mehmetoguzderin Jul 24, 2020
eff4448
Update index.bs
mehmetoguzderin Jul 24, 2020
b458051
Update index.bs
mehmetoguzderin Jul 24, 2020
dadbdf5
Update index.bs
mehmetoguzderin Jul 24, 2020
7b08f77
Update index.bs
mehmetoguzderin Jul 24, 2020
7f40783
Update index.bs
mehmetoguzderin Jul 24, 2020
649d3d0
Add operations
mehmetoguzderin Jul 24, 2020
1eb1337
Format templated parameter
mehmetoguzderin Jul 24, 2020
364141d
Fix comment
mehmetoguzderin Jul 24, 2020
6430da5
Reduce attributes, fix ballot
mehmetoguzderin Jul 25, 2020
98e9ac9
Denormalize definitions
mehmetoguzderin Jul 26, 2020
ed13541
Increase ballot return size
mehmetoguzderin Jul 27, 2020
5423c09
Update index.bs
mehmetoguzderin Aug 3, 2020
f63d2cd
Update index.bs
mehmetoguzderin Aug 4, 2020
3b9dc8f
Remove line break
mehmetoguzderin Aug 4, 2020
40e9311
Remove indexed broadcast
mehmetoguzderin Aug 4, 2020
438b166
Merge branch main into subgroup-operations
mehmetoguzderin Aug 9, 2020
20d2474
Match reorg
mehmetoguzderin Aug 9, 2020
2817b8c
Match rename
mehmetoguzderin Aug 21, 2020
606aad3
Restrict by DXC Types
mehmetoguzderin Aug 25, 2020
97f4136
Merge branch 'main' into subgroup-operations
mehmetoguzderin Sep 10, 2020
d06ad89
resolve conflict
mehmetoguzderin Sep 10, 2020
4862ae2
Remove leader concept
mehmetoguzderin Oct 24, 2020
12b284e
Test CI
mehmetoguzderin Nov 5, 2020
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3 changes: 2 additions & 1 deletion spec/index.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -1005,7 +1005,8 @@ enum GPUExtensionName {
"texture-compression-bc",
"pipeline-statistics-query",
"timestamp-query",
"depth-clamping"
"depth-clamping",
"subgroup-operations"
};
</script>

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46 changes: 46 additions & 0 deletions wgsl/index.bs
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Expand Up @@ -1110,6 +1110,12 @@ variable_decoration

[[builtin global_invocation_id]]
OpDecorate %gl_GlobalInvocationID BuiltIn GlobalInvocationId

[[builtin subgroup_size]]
OpDecorate %gl_SubgroupSize BuiltIn SubgroupSize

[[builtin subgroup_invocation_idx]]
OpDecorate %gl_SubgroupInvocationID BuiltIn SubgroupLocalInvocationId
</xmp>
</div>

Expand All @@ -1129,6 +1135,14 @@ type, function decorations and storage class.
<tr><td>local_invocation_id<td>vec3&ltu32&gt<td>Compute Input
<tr><td>global_invocation_id<td>vec3&ltu32&gt<td>Compute Input
<tr><td>local_invocation_idx<td>u32<td>Compute Input
<tr><td>subgroup_size<td>u32<td>Compute Input<br>
Exists if "subgroup-operations"<br>
is both supported by the device/user<br>
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we don't need to specify this as "both", since the second one requires the first one. We should just talk about what's enabled on the device

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I took that from 6.3. Texture Formats in host spec, does it look good now?

and is enabled in requestDevice
<tr><td>subgroup_invocation_idx<td>u32<td>Compute Input<br>
Exists if "subgroup-operations"<br>
is both supported by the device/user<br>
and is enabled in requestDevice
</table>

<pre class='def'>
Expand Down Expand Up @@ -2747,6 +2761,38 @@ TODO(dsinclair): Add Level-of-Detail via explicit gradient. "Grad" image operand
TODO(dsinclair): Need gather operations
</pre>

## Subgroup built-in functions ## {#subgroup-builtin-functions}

<table class='data'>
<thead>
<tr><td>Subgroup built-in functions<td>SPIR-V
</thead>
<tr><td>subgroup_is_first() -&gt; bool<td>OpGroupNonUniformElect
<tr><td>subgroup_all(bool) -&gt; bool<td>OpGroupNonUniformAll
<tr><td>subgroup_any(bool) -&gt; bool<td>OpGroupNonUniformAny
<tr><td>subgroup_ballot(bool) -&gt; vec4&lt;u32&gt;<td>OpGroupNonUniformBallot
<tr><td>subgroup_broadcast(Scalar,u32) -&gt; Scalar<td>OpGroupNonUniformBroadcast
<tr><td>subgroup_broadcast_first(Scalar) -&gt; Scalar<td>OpGroupNonUniformBroadcastFirst
<tr><td>subgroup_add(Integral) -&gt; Integral<td>OpGroupNonUniformIAdd with Reduce
<tr><td>subgroup_add(Floating) -&gt; Floating<td>OpGroupNonUniformFAdd with Reduce
<tr><td>subgroup_mul(Integral) -&gt; Integral<td>OpGroupNonUniformIMul with Reduce
<tr><td>subgroup_mul(Floating) -&gt; Floating<td>OpGroupNonUniformFMul with Reduce
<tr><td>subgroup_min(Integral) -&gt; Integral<td>OpGroupNonUniformUMin or OpGroupNonUniformSMin with Reduce
<tr><td>subgroup_min(Floating) -&gt; Floating<td>OpGroupNonUniformFMin with Reduce
<tr><td>subgroup_max(Integral) -&gt; Integral<td>OpGroupNonUniformUMax or OpGroupNonUniformSMax with Reduce
<tr><td>subgroup_max(Floating) -&gt; Floating<td>OpGroupNonUniformFMax with Reduce
<tr><td>subgroup_and(Integral) -&gt; Integral<td>OpGroupNonUniformBitwiseAnd
<tr><td>subgroup_or(Integral) -&gt; Integral<td>OpGroupNonUniformBitwiseOr
<tr><td>subgroup_xor(Integral) -&gt; Integral<td>OpGroupNonUniformBitwiseXor
<tr><td>subgroup_prefix_add(Integral) -&gt; Integral<td>OpGroupNonUniformIAdd with ExclusiveScan
<tr><td>subgroup_prefix_add(Floating) -&gt; Floating<td>OpGroupNonUniformFAdd with ExclusiveScan
<tr><td>subgroup_prefix_mul(Integral) -&gt; Integral<td>OpGroupNonUniformIMul with ExclusiveScan
<tr><td>subgroup_prefix_mul(Floating) -&gt; Floating<td>OpGroupNonUniformFMul with ExclusiveScan
</table>

Note: Subgroup functions exist if "subgroup-operations" is both supported
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same here

by the device/user agent and is enabled in requestDevice.

# Glossary # {#glossary}

<table class='data'>
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