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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /arch/mips/math-emu/dp_2008class.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/mips/math-emu/dp_2008class.c')
-rw-r--r--arch/mips/math-emu/dp_2008class.c52
1 files changed, 52 insertions, 0 deletions
diff --git a/arch/mips/math-emu/dp_2008class.c b/arch/mips/math-emu/dp_2008class.c
new file mode 100644
index 0000000000..81a0a63b12
--- /dev/null
+++ b/arch/mips/math-emu/dp_2008class.c
@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * IEEE754 floating point arithmetic
+ * double precision: CLASS.f
+ * FPR[fd] = class(FPR[fs])
+ *
+ * MIPS floating point support
+ * Copyright (C) 2015 Imagination Technologies, Ltd.
+ * Author: Markos Chandras <markos.chandras@imgtec.com>
+ */
+
+#include "ieee754dp.h"
+
+int ieee754dp_2008class(union ieee754dp x)
+{
+ COMPXDP;
+
+ EXPLODEXDP;
+
+ /*
+ * 10 bit mask as follows:
+ *
+ * bit0 = SNAN
+ * bit1 = QNAN
+ * bit2 = -INF
+ * bit3 = -NORM
+ * bit4 = -DNORM
+ * bit5 = -ZERO
+ * bit6 = INF
+ * bit7 = NORM
+ * bit8 = DNORM
+ * bit9 = ZERO
+ */
+
+ switch(xc) {
+ case IEEE754_CLASS_SNAN:
+ return 0x01;
+ case IEEE754_CLASS_QNAN:
+ return 0x02;
+ case IEEE754_CLASS_INF:
+ return 0x04 << (xs ? 0 : 4);
+ case IEEE754_CLASS_NORM:
+ return 0x08 << (xs ? 0 : 4);
+ case IEEE754_CLASS_DNORM:
+ return 0x10 << (xs ? 0 : 4);
+ case IEEE754_CLASS_ZERO:
+ return 0x20 << (xs ? 0 : 4);
+ default:
+ pr_err("Unknown class: %d\n", xc);
+ return 0;
+ }
+}