patch-2.3.16 linux/arch/ppc/math-emu/fmsub.c

• Lines: 55
• Date: Tue Aug 31 11:36:43 1999
• Orig file: v2.3.15/linux/arch/ppc/math-emu/fmsub.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.15/linux/arch/ppc/math-emu/fmsub.c linux/arch/ppc/math-emu/fmsub.c
@@ -0,0 +1,54 @@
+/* $Id: fmsub.c,v 1.1 1999/08/23 18:59:41 cort Exp $
+ */
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <asm/uaccess.h>
+
+#include "soft-fp.h"
+#include "double.h"
+
+int
+fmsub(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);
+	int ret = 0;
+
+#ifdef DEBUG
+	printk("%s: %p %p %p %p\n", __FUNCTION__, frD, frA, frB, frC);
+#endif
+
+	__FP_UNPACK_D(A, frA);
+	__FP_UNPACK_D(B, frB);
+	__FP_UNPACK_D(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))
+		ret |= 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)
+		ret |= 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
+
+	return (ret | __FP_PACK_D(frD, R));
+}