GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/bootloader/u-boot-2020.01/post/lib_powerpc/fpu/mul-subnormal-single-1.c

@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2007
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ */
+/*
+ * This file is originally a part of the GCC testsuite.
+ * Check that certain subnormal numbers (formerly known as denormalized
+ * numbers) are rounded to within 0.5 ulp.  PR other/14354.
+ */
+
+#include <common.h>
+
+#include <post.h>
+
+GNU_FPOST_ATTR
+
+#if CONFIG_POST & CONFIG_SYS_POST_FPU
+
+union uf
+{
+	unsigned int u;
+	float f;
+};
+
+static float
+u2f (unsigned int v)
+{
+	union uf u;
+	u.u = v;
+	return u.f;
+}
+
+static unsigned int
+f2u (float v)
+{
+	union uf u;
+	u.f = v;
+	return u.u;
+}
+
+static int ok = 1;
+
+static void
+tstmul (unsigned int ux, unsigned int uy, unsigned int ur)
+{
+	float x = u2f (ux);
+	float y = u2f (uy);
+
+	if (f2u (x * y) != ur)
+	/* Set a variable rather than aborting here, to simplify tracing when
+	   several computations are wrong.  */
+		ok = 0;
+}
+
+/* We don't want to make this const and static, or else we risk inlining
+   causing the test to fold as constants at compile-time.  */
+struct
+{
+  unsigned int p1, p2, res;
+} static volatile expected[] =
+{
+	{0xfff, 0x3f800400, 0xfff},
+	{0xf, 0x3fc88888, 0x17},
+	{0xf, 0x3f844444, 0xf}
+};
+
+int fpu_post_test_math7 (void)
+{
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(expected); i++)
+	{
+		tstmul (expected[i].p1, expected[i].p2, expected[i].res);
+		tstmul (expected[i].p2, expected[i].p1, expected[i].res);
+	}
+
+	if (!ok) {
+		post_log ("Error in FPU math7 test\n");
+		return -1;
+	}
+	return 0;
+}
+
+#endif /* CONFIG_POST & CONFIG_SYS_POST_FPU */