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Add various NaN-handling macros

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These simplify the implementation of the floating-point Altivec
instructions and reduce clutter.

Signed-off-by: Nathan Froyd <froydnj@codesourcery.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6511 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aurel32 2009-02-04 09:05:53 +00:00
parent 54c5a2ae54
commit 34ba2857a0
1 changed files with 21 additions and 0 deletions
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21
target-ppc/op_helper.c
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@ -1965,6 +1965,23 @@ target_ulong helper_dlmzb (target_ulong high, target_ulong low, uint32_t update_
for (index = ARRAY_SIZE(r->element)-1; index >= 0; index--)
#endif
/* If X is a NaN, store the corresponding QNaN into RESULT. Otherwise,
* execute the following block. */
#define DO_HANDLE_NAN(result, x) \
if (float32_is_nan(x) || float32_is_signaling_nan(x)) { \
CPU_FloatU __f; \
__f.f = x; \
__f.l = __f.l | (1 << 22); /* Set QNaN bit. */ \
result = __f.f; \
} else
#define HANDLE_NAN1(result, x) \
DO_HANDLE_NAN(result, x)
#define HANDLE_NAN2(result, x, y) \
DO_HANDLE_NAN(result, x) DO_HANDLE_NAN(result, y)
#define HANDLE_NAN3(result, x, y, z) \
DO_HANDLE_NAN(result, x) DO_HANDLE_NAN(result, y) DO_HANDLE_NAN(result, z)
/* Saturating arithmetic helpers. */
#define SATCVT(from, to, from_type, to_type, min, max, use_min, use_max) \
static always_inline to_type cvt##from##to (from_type x, int *sat) \
@ -2818,6 +2835,10 @@ VUPK(lsh, s32, s16, UPKLO)
#undef UPKHI
#undef UPKLO
#undef DO_HANDLE_NAN
#undef HANDLE_NAN1
#undef HANDLE_NAN2
#undef HANDLE_NAN3
#undef VECTOR_FOR_INORDER_I
#undef HI_IDX
#undef LO_IDX