From 849369d6c66d3054688672f97d31fceb8e8230fb Mon Sep 17 00:00:00 2001
From: root <root@artemis.panaceas.org>
Date: Fri, 25 Dec 2015 04:40:36 +0000
Subject: initial_commit

---
 arch/powerpc/math-emu/fcmpu.c | 44 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 arch/powerpc/math-emu/fcmpu.c

(limited to 'arch/powerpc/math-emu/fcmpu.c')

diff --git a/arch/powerpc/math-emu/fcmpu.c b/arch/powerpc/math-emu/fcmpu.c
new file mode 100644
index 00000000..d4fb1bab
--- /dev/null
+++ b/arch/powerpc/math-emu/fcmpu.c
@@ -0,0 +1,44 @@
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <asm/uaccess.h>
+
+#include <asm/sfp-machine.h>
+#include <math-emu/soft-fp.h>
+#include <math-emu/double.h>
+
+int
+fcmpu(u32 *ccr, int crfD, void *frA, void *frB)
+{
+	FP_DECL_D(A);
+	FP_DECL_D(B);
+	FP_DECL_EX;
+	int code[4] = { (1 << 3), (1 << 1), (1 << 2), (1 << 0) };
+	long cmp;
+
+#ifdef DEBUG
+	printk("%s: %p (%08x) %d %p %p\n", __func__, ccr, *ccr, crfD, frA, frB);
+#endif
+
+	FP_UNPACK_DP(A, frA);
+	FP_UNPACK_DP(B, frB);
+
+#ifdef DEBUG
+	printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c);
+	printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
+#endif
+
+	FP_CMP_D(cmp, A, B, 2);
+	cmp = code[(cmp + 1) & 3];
+
+	__FPU_FPSCR &= ~(0x1f000);
+	__FPU_FPSCR |= (cmp << 12);
+
+	*ccr &= ~(15 << ((7 - crfD) << 2));
+	*ccr |= (cmp << ((7 - crfD) << 2));
+
+#ifdef DEBUG
+	printk("CR: %08x\n", *ccr);
+#endif
+
+	return 0;
+}
-- 
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