aboutsummaryrefslogtreecommitdiff
path: root/arch/powerpc/math-emu/fcmpo.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/powerpc/math-emu/fcmpo.c')
-rw-r--r--arch/powerpc/math-emu/fcmpo.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/arch/powerpc/math-emu/fcmpo.c b/arch/powerpc/math-emu/fcmpo.c
new file mode 100644
index 00000000000..4efac394b4c
--- /dev/null
+++ b/arch/powerpc/math-emu/fcmpo.c
@@ -0,0 +1,46 @@
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <asm/uaccess.h>
+
+#include "soft-fp.h"
+#include "double.h"
+
+int
+fcmpo(u32 *ccr, int crfD, void *frA, void *frB)
+{
+ FP_DECL_D(A);
+ FP_DECL_D(B);
+ int code[4] = { (1 << 3), (1 << 1), (1 << 2), (1 << 0) };
+ long cmp;
+ int ret = 0;
+
+#ifdef DEBUG
+ printk("%s: %p (%08x) %d %p %p\n", __FUNCTION__, ccr, *ccr, crfD, frA, frB);
+#endif
+
+ __FP_UNPACK_D(A, frA);
+ __FP_UNPACK_D(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
+
+ if (A_c == FP_CLS_NAN || B_c == FP_CLS_NAN)
+ ret |= EFLAG_VXVC;
+
+ 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 ret;
+}