标签：style io ar color os sp strong on div
The conclusion is:
Source code:
#include "arm_neon.h"void test_float_int32_converter(){ const int q = 31; float f[] = {-1.0, -0.5, 0, 0.5}; int32_t i[] = {0, 0, 0, 0}; float32x4_t vf = vld1q_f32(&f[0]); int32x4_t vi = vcvtq_n_s32_f32(vf, q); vst1q_s32(&i[0], vi); printf("Q=%d\n", q); printf("src float 32x4: \t%f,\t%f,\t%f,\t%f\n", f[0], f[1], f[2], f[3]); printf("dst int 32x4: \t%8.8x,\t%8.8x,\t%8.8x,\t%8.8x\n", i[0], i[1], i[2], i[3]); vf = vcvtq_n_f32_s32(vi, q); vst1q_f32(&f[0], vf); printf("dst float 32x4: \t%f,\t%f,\t%f,\t%f\n", f[0], f[1], f[2], f[3]); return;} |
build:
armcc --arm_linux_paths --arm_linux_config_file=/home/jxion/arm_linux_config.xml main.c --cpu=Cortex-A9 -o test.exe |
Result on Pandaboard:
Q=31src float 32x4: -1.000000, -0.500000, 0.000000, 0.500000dst int 32x4: 80000000, c0000000, 00000000, 40000000dst float 32x4: -1.000000, -0.500000, 0.000000, 0.500000 |
Q=31src float 32x4: -1.200000, -0.500000, 1.000000, 1.500000dst int 32x4: 80000000, c0000000, 7fffffff, 7fffffffdst float 32x4: -1.000000, -0.500000, 1.000000, 1.000000[arm neon] data type convert (float <-> int32_t)
标签：style io ar color os sp strong on div
原文地址：http://www.cnblogs.com/xjsxjtu/p/4122752.html
