1 files changed, 54 insertions, 0 deletions

diff --git a/arch/ppc/math-emu/fnmsub.c b/arch/ppc/math-emu/fnmsub.c
new file mode 100644
index 000000000000..f1ca7482b5f0
--- /dev/null
+++ b/arch/ppc/math-emu/fnmsub.c
@@ -0,0 +1,54 @@
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <asm/uaccess.h>
+
+#include "soft-fp.h"
+#include "double.h"
+
+int
+fnmsub(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);
+
+        if (R_c != FP_CLS_NAN)
+                R_s ^= 1;
+
+#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));
+}