Function core_arch::x86::_mm_dp_ps

pub unsafe fn _mm_dp_ps(a: __m128, b: __m128, imm8: i32) -> __m128

This is supported on x86 and target feature sse4.1 only.

Returns the dot product of two __m128 vectors.

imm8[3:0] is the broadcast mask, and imm8[7:4] is the condition mask. If a condition mask bit is zero, the corresponding multiplication is replaced by a value of 0.0. If a broadcast mask bit is one, the result of the dot product will be stored in the return value component. Otherwise if the broadcast mask bit is zero then the return component will be zero.

Intel's documentation