diff options
Diffstat (limited to 'sysdeps/ieee754/flt-32/s_log1pf.c')
| -rw-r--r-- | sysdeps/ieee754/flt-32/s_log1pf.c | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/sysdeps/ieee754/flt-32/s_log1pf.c b/sysdeps/ieee754/flt-32/s_log1pf.c index ade60a2e27..a06190a589 100644 --- a/sysdeps/ieee754/flt-32/s_log1pf.c +++ b/sysdeps/ieee754/flt-32/s_log1pf.c @@ -15,7 +15,10 @@ #include <float.h> #include <math.h> +#include <math-barriers.h> #include <math_private.h> +#include <math-underflow.h> +#include <libc-diag.h> static const float ln2_hi = 6.9313812256e-01, /* 0x3f317180 */ @@ -97,6 +100,18 @@ __log1pf(float x) s = f/((float)2.0+f); z = s*s; R = z*(Lp1+z*(Lp2+z*(Lp3+z*(Lp4+z*(Lp5+z*(Lp6+z*Lp7)))))); - if(k==0) return f-(hfsq-s*(hfsq+R)); else - return k*ln2_hi-((hfsq-(s*(hfsq+R)+(k*ln2_lo+c)))-f); + if (k == 0) + return f - (hfsq - s * (hfsq + R)); + else + { + /* With GCC 7 when compiling with -Os the compiler warns + that c might be used uninitialized. This can't be true + because k must be 0 for c to be uninitialized and we + handled that computation earlier without using c. */ + DIAG_PUSH_NEEDS_COMMENT; + DIAG_IGNORE_Os_NEEDS_COMMENT (7, "-Wmaybe-uninitialized"); + return k * ln2_hi - ((hfsq - (s * (hfsq + R) + + (k * ln2_lo + c))) - f); + DIAG_POP_NEEDS_COMMENT; + } } |