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authorJakub Jelinek <jakub@redhat.com>2013-02-19 17:56:59 +0100
committerJakub Jelinek <jakub@redhat.com>2013-02-19 17:56:59 +0100
commit2389741abb70e282c39125e1017191a985a2cfea (patch)
tree49dbca16aa3ae5a9d6876352e8329d7e3dd4577b /stdlib
parent55e4107b2c70b222b5ceb88d9c0ca68f9699b9ce (diff)
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* stdlib/strtod_l.c (__mpn_lshift_1): Rewritten as function-like
macro.
Diffstat (limited to 'stdlib')
-rw-r--r--stdlib/strtod_l.c44
1 files changed, 23 insertions, 21 deletions
diff --git a/stdlib/strtod_l.c b/stdlib/strtod_l.c
index 5959354..47247b5 100644
--- a/stdlib/strtod_l.c
+++ b/stdlib/strtod_l.c
@@ -444,28 +444,30 @@ str_to_mpn (const STRING_TYPE *str, int digcnt, mp_limb_t *n, mp_size_t *nsize,
/* Shift {PTR, SIZE} COUNT bits to the left, and fill the vacated bits
with the COUNT most significant bits of LIMB.
- Tege doesn't like this function so I have to write it here myself. :)
+ Implemented as a macro, so that __builtin_constant_p works even at -O0.
+
+ Tege doesn't like this macro so I have to write it here myself. :)
--drepper */
-static inline void
-__attribute ((always_inline))
-__mpn_lshift_1 (mp_limb_t *ptr, mp_size_t size, unsigned int count,
- mp_limb_t limb)
-{
- if (__builtin_constant_p (count) && count == BITS_PER_MP_LIMB)
- {
- /* Optimize the case of shifting by exactly a word:
- just copy words, with no actual bit-shifting. */
- mp_size_t i;
- for (i = size - 1; i > 0; --i)
- ptr[i] = ptr[i - 1];
- ptr[0] = limb;
- }
- else
- {
- (void) __mpn_lshift (ptr, ptr, size, count);
- ptr[0] |= limb >> (BITS_PER_MP_LIMB - count);
- }
-}
+#define __mpn_lshift_1(ptr, size, count, limb) \
+ do \
+ { \
+ mp_limb_t *__ptr = (ptr); \
+ if (__builtin_constant_p (count) && count == BITS_PER_MP_LIMB) \
+ { \
+ mp_size_t i; \
+ for (i = (size) - 1; i > 0; --i) \
+ __ptr[i] = __ptr[i - 1]; \
+ __ptr[0] = (limb); \
+ } \
+ else \
+ { \
+ /* We assume count > 0 && count < BITS_PER_MP_LIMB here. */ \
+ unsigned int __count = (count); \
+ (void) __mpn_lshift (__ptr, __ptr, size, __count); \
+ __ptr[0] |= (limb) >> (BITS_PER_MP_LIMB - __count); \
+ } \
+ } \
+ while (0)
#define INTERNAL(x) INTERNAL1(x)