From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 arch/powerpc/math-emu/fmsubs.c | 55 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 arch/powerpc/math-emu/fmsubs.c

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

diff --git a/arch/powerpc/math-emu/fmsubs.c b/arch/powerpc/math-emu/fmsubs.c
new file mode 100644
index 000000000..3425bc899
--- /dev/null
+++ b/arch/powerpc/math-emu/fmsubs.c
@@ -0,0 +1,55 @@
+#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>
+#include <math-emu/single.h>
+
+int
+fmsubs(void *frD, void *frA, void *frB, void *frC)
+{
+	FP_DECL_D(R);
+	FP_DECL_D(A);
+	FP_DECL_D(B);
+	FP_DECL_D(C);
+	FP_DECL_D(T);
+	FP_DECL_EX;
+
+#ifdef DEBUG
+	printk("%s: %p %p %p %p\n", __func__, frD, frA, frB, frC);
+#endif
+
+	FP_UNPACK_DP(A, frA);
+	FP_UNPACK_DP(B, frB);
+	FP_UNPACK_DP(C, frC);
+
+#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);
+	printk("C: %ld %lu %lu %ld (%ld)\n", C_s, C_f1, C_f0, C_e, C_c);
+#endif
+
+	if ((A_c == FP_CLS_INF && C_c == FP_CLS_ZERO) ||
+	    (A_c == FP_CLS_ZERO && C_c == FP_CLS_INF))
+		FP_SET_EXCEPTION(EFLAG_VXIMZ);
+
+	FP_MUL_D(T, A, C);
+
+	if (B_c != FP_CLS_NAN)
+		B_s ^= 1;
+
+	if (T_s != B_s && T_c == FP_CLS_INF && B_c == FP_CLS_INF)
+		FP_SET_EXCEPTION(EFLAG_VXISI);
+
+	FP_ADD_D(R, T, B);
+
+#ifdef DEBUG
+	printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
+#endif
+
+	__FP_PACK_DS(frD, R);
+
+	return FP_CUR_EXCEPTIONS;
+}
-- 
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