kernel.CollectiveMathFlags enum

← Attribute reference

Floating-point collective requirements. Without preserve, sums and products use the target's native collective arithmetic, including its intermediate precision and exceptional-value behavior. Extrema always retain the selected combining kind's NaN and signed-zero semantics. Unsupported requirements fail compilation rather than weakening semantics.

Cases

Keyword	Value	Description
preserve	1	Require a parallel tree of source-format combining operations, preserving their rounding, subnormal, signed-zero, and nonfinite semantics. This does not prescribe a tree or serial evaluation order.

Used by

• kernel.subgroup.reduce.math
• kernel.subgroup.scan.math
• kernel.workgroup.reduce.math
• kernel.workgroup.scan.math