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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/s_csinh_template.c | |
| parent | 352db0bd059df1ad2da5d22e6ea3fd3e4f2ce236 (diff) | |
| download | glibc-4d5940f0151241b73c6c0c1eb290462eb9c279b0.tar.gz glibc-4d5940f0151241b73c6c0c1eb290462eb9c279b0.tar.xz glibc-4d5940f0151241b73c6c0c1eb290462eb9c279b0.zip | |
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/s_csinh_template.c')
| -rw-r--r-- | math/s_csinh_template.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/math/s_csinh_template.c b/math/s_csinh_template.c index 22c0c315b0..45fbb36fd9 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); |