__lasx_xvftint_lu_d

LASX intrinsic · group: Floating Point Conversion

Synopsis

__m256i __lasx_xvftint_lu_d (__m256d a)
#include <lasxintrin.h>
Instruction: xvftint.lu.d xr, xr
CPU Flags: LASX

Description

Convert double-precision floating point elements in a to unsigned 64-bit integer, using current rounding mode specified in fscr.

Operation

for (int i = 0; i < 4; i++) {
  dst.dword[i] = (u64)a.fp64[i]; // rounding mode is not expressed in C
}

// Expands to:

if (0) {
  dst.dword[0] = (u64)a.fp64[0];
  dst.dword[1] = (u64)a.fp64[1];
  dst.dword[2] = (u64)a.fp64[2];
  dst.dword[3] = (u64)a.fp64[3];
}

Latency and Throughput

CPU	µarch	Latency	Throughput (IPC)
3C5000	LA464	4	2
3A6000	LA664	4	4
3C6000	LA664	4	4

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