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| author | Joseph Myers <joseph@codesourcery.com> | 2015-09-17 16:47:14 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2015-09-17 16:47:14 +0000 |
| commit | b8682397ab2db1aed7f25d0a0c7c81134a97c8c7 (patch) | |
| tree | 76b6a9cbc7456f7ee53fe40cc86e0c7fe5e87f7a /sysdeps/ieee754/dbl-64 | |
| parent | 46f74e1deee549b41160d353ce0c8f7db555d36c (diff) | |
| download | glibc-b8682397ab2db1aed7f25d0a0c7c81134a97c8c7.zip glibc-b8682397ab2db1aed7f25d0a0c7c81134a97c8c7.tar.gz glibc-b8682397ab2db1aed7f25d0a0c7c81134a97c8c7.tar.bz2 | |
Reduce number of constants in __finite* (bug 15384).
Bug 15384 notes that in __finite, two different constants are used
that could be the same constant (the result only depends on the
exponent of the floating-point representation), and that using the
same constant is better for architectures where constants need loading
from a constant pool. This patch implements that change.
Tested for x86_64, mips64 and powerpc.
[BZ #15384]
* sysdeps/ieee754/dbl-64/s_finite.c (FINITE): Use same constant as
bit-mask as in subtraction.
* sysdeps/ieee754/dbl-64/wordsize-64/s_finite.c (__finite):
Likewise.
* sysdeps/ieee754/flt-32/s_finitef.c (FINITEF): Likewise.
* sysdeps/ieee754/ldbl-128/s_finitel.c (__finitel): Likewise.
* sysdeps/ieee754/ldbl-128ibm/s_finitel.c (__finitel): Likewise.
Diffstat (limited to 'sysdeps/ieee754/dbl-64')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/s_finite.c | 2 | ||||
| -rw-r--r-- | sysdeps/ieee754/dbl-64/wordsize-64/s_finite.c | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/sysdeps/ieee754/dbl-64/s_finite.c b/sysdeps/ieee754/dbl-64/s_finite.c index 49986bb..2b0ed50 100644 --- a/sysdeps/ieee754/dbl-64/s_finite.c +++ b/sysdeps/ieee754/dbl-64/s_finite.c @@ -32,7 +32,7 @@ int FINITE(double x) { int32_t hx; GET_HIGH_WORD (hx, x); - return (int) ((u_int32_t) ((hx & 0x7fffffff) - 0x7ff00000) >> 31); + return (int) ((u_int32_t) ((hx & 0x7ff00000) - 0x7ff00000) >> 31); } hidden_def (__finite) weak_alias (__finite, finite) diff --git a/sysdeps/ieee754/dbl-64/wordsize-64/s_finite.c b/sysdeps/ieee754/dbl-64/wordsize-64/s_finite.c index fcf2e6d..a155a5e 100644 --- a/sysdeps/ieee754/dbl-64/wordsize-64/s_finite.c +++ b/sysdeps/ieee754/dbl-64/wordsize-64/s_finite.c @@ -24,7 +24,7 @@ __finite(double x) { int64_t lx; EXTRACT_WORDS64(lx,x); - return (int)((uint64_t)((lx&INT64_C(0x7fffffffffffffff))-INT64_C(0x7ff0000000000000))>>63); + return (int)((uint64_t)((lx&INT64_C(0x7ff0000000000000))-INT64_C(0x7ff0000000000000))>>63); } hidden_def (__finite) weak_alias (__finite, finite) |