什么是check

什么是check_union256d？(What is the check_union256d? [closed])

什么是check_union256d函数？

它放在以下代码中：

/* { dg-do run } */ /* { dg-require-effective-target avx } */ /* { dg-options "-O2 -mavx" } */ #include "avx-check.h" void static avx_test (void) { int i; union256d u, s1, s2; double e [4]; s1.x = _mm256_set_pd (2134.3343,1234.635654,453.345635,54646.464356); s2.x = _mm256_set_pd (41124.234,2344.2354,8653.65635,856.43576); u.x = _mm256_div_pd (s1.x, s2.x); for (i = 0; i < 4; i++) e[i] = s1.a[i] / s2.a[i]; if (check_union256d (u, e)) abort (); }

What is the check_union256d function?

It's placed in following code:

/* { dg-do run } */ /* { dg-require-effective-target avx } */ /* { dg-options "-O2 -mavx" } */ #include "avx-check.h" void static avx_test (void) { int i; union256d u, s1, s2; double e [4]; s1.x = _mm256_set_pd (2134.3343,1234.635654,453.345635,54646.464356); s2.x = _mm256_set_pd (41124.234,2344.2354,8653.65635,856.43576); u.x = _mm256_div_pd (s1.x, s2.x); for (i = 0; i < 4; i++) e[i] = s1.a[i] / s2.a[i]; if (check_union256d (u, e)) abort (); }

最满意答案

它来自英特尔AVX ，它是：

SSE的新256位指令集扩展，专为浮点（FP）密集型应用而设计。

It's from Intel AVX which is:

a new 256 bit instruction set extension to SSE and is designed for applications that are Floating Point (FP) intensive.