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author | Joseph Myers <joseph@codesourcery.com> | 2015-09-17 16:47:14 +0000 |
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committer | Joseph Myers <joseph@codesourcery.com> | 2015-09-17 16:47:14 +0000 |
commit | b8682397ab2db1aed7f25d0a0c7c81134a97c8c7 (patch) | |
tree | 76b6a9cbc7456f7ee53fe40cc86e0c7fe5e87f7a /sysdeps | |
parent | 46f74e1deee549b41160d353ce0c8f7db555d36c (diff) | |
download | glibc-b8682397ab2db1aed7f25d0a0c7c81134a97c8c7.tar.gz glibc-b8682397ab2db1aed7f25d0a0c7c81134a97c8c7.tar.xz glibc-b8682397ab2db1aed7f25d0a0c7c81134a97c8c7.zip |
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')
-rw-r--r-- | sysdeps/ieee754/dbl-64/s_finite.c | 2 | ||||
-rw-r--r-- | sysdeps/ieee754/dbl-64/wordsize-64/s_finite.c | 2 | ||||
-rw-r--r-- | sysdeps/ieee754/flt-32/s_finitef.c | 2 | ||||
-rw-r--r-- | sysdeps/ieee754/ldbl-128/s_finitel.c | 2 | ||||
-rw-r--r-- | sysdeps/ieee754/ldbl-128ibm/s_finitel.c | 2 |
5 files changed, 5 insertions, 5 deletions
diff --git a/sysdeps/ieee754/dbl-64/s_finite.c b/sysdeps/ieee754/dbl-64/s_finite.c index 49986bbde9..2b0ed504f9 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 fcf2e6d5b6..a155a5e1ef 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) diff --git a/sysdeps/ieee754/flt-32/s_finitef.c b/sysdeps/ieee754/flt-32/s_finitef.c index 4ea270ae07..4c5b339235 100644 --- a/sysdeps/ieee754/flt-32/s_finitef.c +++ b/sysdeps/ieee754/flt-32/s_finitef.c @@ -35,7 +35,7 @@ int FINITEF(float x) { int32_t ix; GET_FLOAT_WORD(ix,x); - return (int)((u_int32_t)((ix&0x7fffffff)-0x7f800000)>>31); + return (int)((u_int32_t)((ix&0x7f800000)-0x7f800000)>>31); } hidden_def (__finitef) weak_alias (__finitef, finitef) diff --git a/sysdeps/ieee754/ldbl-128/s_finitel.c b/sysdeps/ieee754/ldbl-128/s_finitel.c index f862a448ed..ea8a9ba379 100644 --- a/sysdeps/ieee754/ldbl-128/s_finitel.c +++ b/sysdeps/ieee754/ldbl-128/s_finitel.c @@ -29,7 +29,7 @@ int __finitel(long double x) { int64_t hx; GET_LDOUBLE_MSW64(hx,x); - return (int)((u_int64_t)((hx&0x7fffffffffffffffLL) + return (int)((u_int64_t)((hx&0x7fff000000000000LL) -0x7fff000000000000LL)>>63); } hidden_def (__finitel) diff --git a/sysdeps/ieee754/ldbl-128ibm/s_finitel.c b/sysdeps/ieee754/ldbl-128ibm/s_finitel.c index b562ce60b6..3b9e3de292 100644 --- a/sysdeps/ieee754/ldbl-128ibm/s_finitel.c +++ b/sysdeps/ieee754/ldbl-128ibm/s_finitel.c @@ -34,7 +34,7 @@ ___finitel (long double x) xhi = ldbl_high (x); EXTRACT_WORDS64 (hx, xhi); - hx &= 0x7fffffffffffffffLL; + hx &= 0x7ff0000000000000LL; hx -= 0x7ff0000000000000LL; return hx >> 63; } |