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authorSzabolcs Nagy <nsz@port70.net>2013-09-04 16:39:41 +0000
committerSzabolcs Nagy <nsz@port70.net>2013-09-05 11:30:08 +0000
commit63b9cc777323488da3474e8bc53e0ac4d3521382 (patch)
treeb82e0a0dd1f887c53e915d67d554b93d9feb4a86 /src
parent94a3d13ae69764c0e2b67c6e17dc5126e103d0e3 (diff)
downloadmusl-63b9cc777323488da3474e8bc53e0ac4d3521382.tar.gz
math: remove *_WORD64 macros from libm.h
only fma used these macros and the explicit union is clearer
Diffstat (limited to 'src')
-rw-r--r--src/internal/libm.h16
-rw-r--r--src/math/fma.c26
2 files changed, 13 insertions, 29 deletions
diff --git a/src/internal/libm.h b/src/internal/libm.h
index d7562d10..99448a08 100644
--- a/src/internal/libm.h
+++ b/src/internal/libm.h
@@ -80,14 +80,6 @@ do { \
(lo) = (uint32_t)__u.bits; \
} while (0)
-/* Get a 64 bit int from a double. */
-#define EXTRACT_WORD64(i,d) \
-do { \
- union dshape __u; \
- __u.value = (d); \
- (i) = __u.bits; \
-} while (0)
-
/* Get the more significant 32 bit int from a double. */
#define GET_HIGH_WORD(i,d) \
do { \
@@ -112,14 +104,6 @@ do { \
(d) = __u.value; \
} while (0)
-/* Set a double from a 64 bit int. */
-#define INSERT_WORD64(d,i) \
-do { \
- union dshape __u; \
- __u.bits = (i); \
- (d) = __u.value; \
-} while (0)
-
/* Set the more significant 32 bits of a double from an int. */
#define SET_HIGH_WORD(d,hi) \
do { \
diff --git a/src/math/fma.c b/src/math/fma.c
index 1b1c1321..84868be5 100644
--- a/src/math/fma.c
+++ b/src/math/fma.c
@@ -232,16 +232,16 @@ static inline struct dd dd_add(double a, double b)
static inline double add_adjusted(double a, double b)
{
struct dd sum;
- uint64_t hibits, lobits;
+ union {double f; uint64_t i;} uhi, ulo;
sum = dd_add(a, b);
if (sum.lo != 0) {
- EXTRACT_WORD64(hibits, sum.hi);
- if ((hibits & 1) == 0) {
+ uhi.f = sum.hi;
+ if ((uhi.i & 1) == 0) {
/* hibits += (int)copysign(1.0, sum.hi * sum.lo) */
- EXTRACT_WORD64(lobits, sum.lo);
- hibits += 1 - ((hibits ^ lobits) >> 62);
- INSERT_WORD64(sum.hi, hibits);
+ ulo.f = sum.lo;
+ uhi.i += 1 - ((uhi.i ^ ulo.i) >> 62);
+ sum.hi = uhi.f;
}
}
return (sum.hi);
@@ -255,7 +255,7 @@ static inline double add_adjusted(double a, double b)
static inline double add_and_denormalize(double a, double b, int scale)
{
struct dd sum;
- uint64_t hibits, lobits;
+ union {double f; uint64_t i;} uhi, ulo;
int bits_lost;
sum = dd_add(a, b);
@@ -271,13 +271,13 @@ static inline double add_and_denormalize(double a, double b, int scale)
* break the ties manually.
*/
if (sum.lo != 0) {
- EXTRACT_WORD64(hibits, sum.hi);
- bits_lost = -((int)(hibits >> 52) & 0x7ff) - scale + 1;
- if (bits_lost != 1 ^ (int)(hibits & 1)) {
+ uhi.f = sum.hi;
+ bits_lost = -((int)(uhi.i >> 52) & 0x7ff) - scale + 1;
+ if (bits_lost != 1 ^ (int)(uhi.i & 1)) {
/* hibits += (int)copysign(1.0, sum.hi * sum.lo) */
- EXTRACT_WORD64(lobits, sum.lo);
- hibits += 1 - (((hibits ^ lobits) >> 62) & 2);
- INSERT_WORD64(sum.hi, hibits);
+ ulo.f = sum.lo;
+ uhi.i += 1 - (((uhi.i ^ ulo.i) >> 62) & 2);
+ sum.hi = uhi.f;
}
}
return scalbn(sum.hi, scale);