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| author | Szabolcs Nagy <nsz@port70.net> | 2013-09-04 16:39:41 +0000 |
|---|---|---|
| committer | Szabolcs Nagy <nsz@port70.net> | 2013-09-05 11:30:08 +0000 |
| commit | 63b9cc777323488da3474e8bc53e0ac4d3521382 (patch) | |
| tree | b82e0a0dd1f887c53e915d67d554b93d9feb4a86 /src | |
| parent | 94a3d13ae69764c0e2b67c6e17dc5126e103d0e3 (diff) | |
| download | musl-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.h | 16 | ||||
| -rw-r--r-- | src/math/fma.c | 26 |
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); |