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Execution is a Scope that identifies the group of
invocations affected by this command. It must be Subgroup.
The identity I for Operation is 0. If Operation is ClusteredReduce, ClusterSize must be present.
The type of Value must be the same as Result Type. The method used
to perform the group operation on the contributed Value(s) from active
invocations is implementation defined.
ClusterSize is the size of cluster to use. ClusterSize must be a
scalar of integer type, whose Signedness operand is 0. ClusterSize must come from a constant
instruction. Behavior is undefined unless ClusterSize is at least 1 and a power of 2. If ClusterSize is
greater than the size of the group, executing this instruction
results in undefined behavior.
Marking re-estimate this. Since this was originally refined, we have a different approach to implementing intrinsics and the way we've been estimating intrinsics has changed quite a bit.
WaveActiveSum
clang builtin,WaveActiveSum
clang builtin withhlsl_intrinsics.h
WaveActiveSum
toCheckHLSLBuiltinFunctionCall
inSemaChecking.cpp
WaveActiveSum
toEmitHLSLBuiltinExpr
inCGBuiltin.cpp
clang/test/CodeGenHLSL/builtins/WaveActiveSum.hlsl
clang/test/SemaHLSL/BuiltIns/WaveActiveSum-errors.hlsl
int_dx_WaveActiveSum
intrinsic inIntrinsicsDirectX.td
DXILOpMapping
ofint_dx_WaveActiveSum
to119
inDXIL.td
WaveActiveSum.ll
andWaveActiveSum_errors.ll
tests inllvm/test/CodeGen/DirectX/
int_spv_WaveActiveSum
intrinsic inIntrinsicsSPIRV.td
WaveActiveSum
lowering and map it toint_spv_WaveActiveSum
inSPIRVInstructionSelector::selectIntrinsic
.llvm/test/CodeGen/SPIRV/hlsl-intrinsics/WaveActiveSum.ll
DirectX
SPIR-V
OpGroupNonUniformFAdd:
Description:
A floating point add group operation of all Value
operands contributed by active invocations in the
group.
Result Type must be a scalar or vector of floating-point
type.
Execution is a Scope that identifies the group of
invocations affected by this command. It must be Subgroup.
The identity I for Operation is 0. If Operation is
ClusteredReduce, ClusterSize must be present.
The type of Value must be the same as Result Type. The method used
to perform the group operation on the contributed Value(s) from active
invocations is implementation defined.
ClusterSize is the size of cluster to use. ClusterSize must be a
scalar of integer type, whose Signedness operand is 0.
ClusterSize must come from a constant
instruction. Behavior is undefined unless
ClusterSize is at least 1 and a power of 2. If ClusterSize is
greater than the size of the group, executing this instruction
results in undefined behavior.
Capability:
GroupNonUniformArithmetic, GroupNonUniformClustered,
GroupNonUniformPartitionedNV
Missing before version 1.3.
6 + variable
350
<id>
Result Type
Result <id>
Scope <id>
Execution
Group Operation
Operation
<id>
Value
Optional
<id>
ClusterSize
Test Case(s)
Example 1
Example 2
Example 3
HLSL:
Sums up the value of the expression across all active lanes in the current wave and replicates it to all lanes in the current wave.
Syntax
Parameters
expr
The expression to evaluate.
Return value
The sum value.
Remarks
The order of operations is undefined.
This function is supported from shader model 6.0 in all shader stages.
Examples
See also
Overview of Shader Model 6
Shader Model 6
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