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| author | Joseph Myers <joseph@codesourcery.com> | 2016-10-11 00:50:43 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2016-10-11 00:50:43 +0000 |
| commit | 4d5940f0151241b73c6c0c1eb290462eb9c279b0 (patch) | |
| tree | f0929fb2863a195e3052febb3d9504125cdb7391 /math | |
| parent | 352db0bd059df1ad2da5d22e6ea3fd3e4f2ce236 (diff) | |
| download | glibc-4d5940f0151241b73c6c0c1eb290462eb9c279b0.zip glibc-4d5940f0151241b73c6c0c1eb290462eb9c279b0.tar.gz glibc-4d5940f0151241b73c6c0c1eb290462eb9c279b0.tar.bz2 | |
Avoid M_NAN + M_NAN in complex functions.
Some libm complex functions have code that computes M_NAN + M_NAN.
This is nonsensical; it's just equivalent to M_NAN, since it's a quiet
NaN (and the comments suggesting this raises an exception are
similarly wrong). This patch changes the code just to use M_NAN (and
removes the bogus comments). (Preferably, code should either
propagate an input NaN or do a computation that raises "invalid" and
generates a default NaN at the same time. There are various cases,
however, that currently raise "invalid" even for NaN inputs; I think
those are cases where "invalid" is optional in ISO C so a change to
whether it's raised would be OK, but they would still need more
careful consideration than the cases where such issues do not arise.)
Tested for x86_64 and x86 (testsuite, and that installed stripped
shared libraries are unchanged by the patch).
* math/s_ccosh_template.c (M_DECL_FUNC (__ccosh)): Use M_NAN
instead of M_NAN + M_NAN.
* math/s_csinh_template.c (M_DECL_FUNC (__csinh)): Likewise.
Diffstat (limited to 'math')
| -rw-r--r-- | math/s_ccosh_template.c | 5 | ||||
| -rw-r--r-- | math/s_csinh_template.c | 5 |
2 files changed, 4 insertions, 6 deletions
diff --git a/math/s_ccosh_template.c b/math/s_ccosh_template.c index 68de41d..7fea5c9 100644 --- a/math/s_ccosh_template.c +++ b/math/s_ccosh_template.c @@ -88,7 +88,7 @@ M_DECL_FUNC (__ccosh) (CFLOAT x) else { __imag__ retval = __real__ x == 0 ? 0 : M_NAN; - __real__ retval = M_NAN + M_NAN; + __real__ retval = M_NAN; if (icls == FP_INFINITE) feraiseexcept (FE_INVALID); @@ -124,9 +124,8 @@ M_DECL_FUNC (__ccosh) (CFLOAT x) } else { - /* The addition raises the invalid exception. */ __real__ retval = M_HUGE_VAL; - __imag__ retval = M_NAN + M_NAN; + __imag__ retval = M_NAN; if (icls == FP_INFINITE) feraiseexcept (FE_INVALID); diff --git a/math/s_csinh_template.c b/math/s_csinh_template.c index 22c0c31..45fbb36 100644 --- a/math/s_csinh_template.c +++ b/math/s_csinh_template.c @@ -97,7 +97,7 @@ M_DECL_FUNC (__csinh) (CFLOAT x) { /* Real part is 0.0. */ __real__ retval = M_COPYSIGN (0, negate ? -1 : 1); - __imag__ retval = M_NAN + M_NAN; + __imag__ retval = M_NAN; if (icls == FP_INFINITE) feraiseexcept (FE_INVALID); @@ -143,9 +143,8 @@ M_DECL_FUNC (__csinh) (CFLOAT x) } else { - /* The addition raises the invalid exception. */ __real__ retval = M_HUGE_VAL; - __imag__ retval = M_NAN + M_NAN; + __imag__ retval = M_NAN; if (icls == FP_INFINITE) feraiseexcept (FE_INVALID); |