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| author | nsz <nsz@port70.net> | 2012-03-20 15:17:15 +0100 |
|---|---|---|
| committer | nsz <nsz@port70.net> | 2012-03-20 15:17:15 +0100 |
| commit | 1e2fea632b0257745ece5379378a1485f119602a (patch) | |
| tree | 9ca395de2ed082b2920675c42207be8796985202 | |
| parent | 03c52e137a28f65519bf6e7c303e5bd25df6e929 (diff) | |
| download | musl-1e2fea632b0257745ece5379378a1485f119602a.tar.gz musl-1e2fea632b0257745ece5379378a1485f119602a.tar.xz musl-1e2fea632b0257745ece5379378a1485f119602a.zip | |
fix a cbrtl.c regression and remove x87 precision setting
| -rw-r--r-- | src/math/cbrtl.c | 33 |
1 files changed, 6 insertions, 27 deletions
diff --git a/src/math/cbrtl.c b/src/math/cbrtl.c index 5297d68f..0af65ef5 100644 --- a/src/math/cbrtl.c +++ b/src/math/cbrtl.c @@ -23,9 +23,9 @@ long double cbrtl(long double x) return cbrt(x); } #elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384 -#define BIAS (LDBL_MAX_EXP - 1) -static const unsigned -B1 = 709958130; /* B1 = (127-127.0/3-0.03306235651)*2**23 */ + +#define BIAS (LDBL_MAX_EXP - 1) +static const unsigned B1 = 709958130; /* B1 = (127-127.0/3-0.03306235651)*2**23 */ long double cbrtl(long double x) { @@ -48,25 +48,10 @@ long double cbrtl(long double x) if (k == BIAS + LDBL_MAX_EXP) return x + x; -// FIXME: extended precision is default on linux.. -#undef __i386__ -#ifdef __i386__ - fp_prec_t oprec; - - oprec = fpgetprec(); - if (oprec != FP_PE) - fpsetprec(FP_PE); -#endif - if (k == 0) { /* If x = +-0, then cbrt(x) = +-0. */ - if ((u.bits.manh | u.bits.manl) == 0) { -#ifdef __i386__ - if (oprec != FP_PE) - fpsetprec(oprec); -#endif - return (x); - } + if ((u.bits.manh | u.bits.manl) == 0) + return x; /* Adjust subnormal numbers. */ u.e *= 0x1.0p514; k = u.bits.exp; @@ -118,7 +103,7 @@ long double cbrtl(long double x) * Round it away from zero to 32 bits (32 so that t*t is exact, and * away from zero for technical reasons). */ - t = dt + (0x1.0p32L + 0x1.0p-32L) - 0x1.0p32; + t = dt + (0x1.0p32L + 0x1.0p-31L) - 0x1.0p32; #elif LDBL_MANT_DIG == 113 /* * Round dt away from zero to 47 bits. Since we don't trust the 47, @@ -129,8 +114,6 @@ long double cbrtl(long double x) * dt is much more accurate than needed. */ t = dt + 0x2.0p-46 + 0x1.0p60L - 0x1.0p60; -#else -#error "Unsupported long double format" #endif /* @@ -144,10 +127,6 @@ long double cbrtl(long double x) t = t+t*r; /* error <= 0.5 + 0.5/3 + epsilon */ t *= v.e; -#ifdef __i386__ - if (oprec != FP_PE) - fpsetprec(oprec); -#endif return t; } #endif |