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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/ppc/math-emu/fmsub.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/ppc/math-emu/fmsub.c')
-rw-r--r--arch/ppc/math-emu/fmsub.c51
1 files changed, 51 insertions, 0 deletions
diff --git a/arch/ppc/math-emu/fmsub.c b/arch/ppc/math-emu/fmsub.c
new file mode 100644
index 000000000000..203fd48a6fec
--- /dev/null
+++ b/arch/ppc/math-emu/fmsub.c
@@ -0,0 +1,51 @@
1#include <linux/types.h>
2#include <linux/errno.h>
3#include <asm/uaccess.h>
4
5#include "soft-fp.h"
6#include "double.h"
7
8int
9fmsub(void *frD, void *frA, void *frB, void *frC)
10{
11 FP_DECL_D(R);
12 FP_DECL_D(A);
13 FP_DECL_D(B);
14 FP_DECL_D(C);
15 FP_DECL_D(T);
16 int ret = 0;
17
18#ifdef DEBUG
19 printk("%s: %p %p %p %p\n", __FUNCTION__, frD, frA, frB, frC);
20#endif
21
22 __FP_UNPACK_D(A, frA);
23 __FP_UNPACK_D(B, frB);
24 __FP_UNPACK_D(C, frC);
25
26#ifdef DEBUG
27 printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c);
28 printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
29 printk("C: %ld %lu %lu %ld (%ld)\n", C_s, C_f1, C_f0, C_e, C_c);
30#endif
31
32 if ((A_c == FP_CLS_INF && C_c == FP_CLS_ZERO) ||
33 (A_c == FP_CLS_ZERO && C_c == FP_CLS_INF))
34 ret |= EFLAG_VXIMZ;
35
36 FP_MUL_D(T, A, C);
37
38 if (B_c != FP_CLS_NAN)
39 B_s ^= 1;
40
41 if (T_s != B_s && T_c == FP_CLS_INF && B_c == FP_CLS_INF)
42 ret |= EFLAG_VXISI;
43
44 FP_ADD_D(R, T, B);
45
46#ifdef DEBUG
47 printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
48#endif
49
50 return (ret | __FP_PACK_D(frD, R));
51}