__lasx_xvftinth_l_s

LASX intrinsic · group: Floating Point Conversion

Synopsis

__m256i __lasx_xvftinth_l_s (__m256 a)
#include <lasxintrin.h>
Instruction: xvftinth.l.s xr, xr
CPU Flags: LASX

Description

Convert single-precision floating point elements in higher part of every 128-bit vector of a to signed 64-bit integer, using current rounding mode specified in fscr.

Operation

for (int i = 0; i < 2; i++) {
  dst.dword[i] = (s64)a.fp32[i + 2]; // rounding mode is not expressed in C
}
for (int i = 2; i < 4; i++) {
  dst.dword[i] = (s64)a.fp32[i + 4]; // rounding mode is not expressed in C
}

// Expands to:

if (0) {
  dst.dword[0] = (s64)a.fp32[2];
  dst.dword[1] = (s64)a.fp32[3];
  dst.dword[2] = (s64)a.fp32[6];
  dst.dword[3] = (s64)a.fp32[7];
}

Latency and Throughput

CPU	µarch	Latency	Throughput (IPC)
3C5000	LA464	5	1
3A6000	LA664	5	2
3C6000	LA664	5	2

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