summaryrefslogtreecommitdiff
path: root/arch/powerpc/math-emu/fnmadd.c
diff options
context:
space:
mode:
authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/powerpc/math-emu/fnmadd.c
Initial import
Diffstat (limited to 'arch/powerpc/math-emu/fnmadd.c')
-rw-r--r--arch/powerpc/math-emu/fnmadd.c54
1 files changed, 54 insertions, 0 deletions
diff --git a/arch/powerpc/math-emu/fnmadd.c b/arch/powerpc/math-emu/fnmadd.c
new file mode 100644
index 000000000..e817bc545
--- /dev/null
+++ b/arch/powerpc/math-emu/fnmadd.c
@@ -0,0 +1,54 @@
+#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
+fnmadd(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 (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);
+
+ 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
+
+ __FP_PACK_D(frD, R);
+
+ return FP_CUR_EXCEPTIONS;
+}