diff options
| -rw-r--r-- | ChangeLog | 12 | ||||
| -rw-r--r-- | sysdeps/ieee754/dbl-64/s_log1p.c | 12 | ||||
| -rw-r--r-- | sysdeps/ieee754/flt-32/s_log1pf.c | 17 |
3 files changed, 38 insertions, 3 deletions
diff --git a/ChangeLog b/ChangeLog index 585e69d43f..7923327a9d 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,15 @@ +2018-02-01 Carlos O'Donell <carlos@redhat.com> + Ramin Seyed-Moussavi <lordrasmus@gmail.com> + Joseph Myers <joseph@codesourcery.com> + + [BZ #21314] + * sysdeps/ieee754/dbl-64/s_log1p.c: Include <libc-diag.h>. + (__log1p): Disable -Wmaybe-uninitialized for -Os around + computation using c. + * sysdeps/ieee754/flt-32/s_log1pf.c: Include <libc-diag.h>. + (__log1pf): Disable -Wmaybe-uninitialized for -Os around + computation using c. + 2018-02-01 Dmitry V. Levin <ldv@altlinux.org> * version.h (RELEASE): Set to "development". diff --git a/sysdeps/ieee754/dbl-64/s_log1p.c b/sysdeps/ieee754/dbl-64/s_log1p.c index 340f6377f7..b7cf5ce321 100644 --- a/sysdeps/ieee754/dbl-64/s_log1p.c +++ b/sysdeps/ieee754/dbl-64/s_log1p.c @@ -81,6 +81,7 @@ #include <float.h> #include <math.h> #include <math_private.h> +#include <libc-diag.h> static const double ln2_hi = 6.93147180369123816490e-01, /* 3fe62e42 fee00000 */ @@ -191,5 +192,14 @@ __log1p (double x) if (k == 0) return f - (hfsq - s * (hfsq + R)); else - return k * ln2_hi - ((hfsq - (s * (hfsq + R) + (k * ln2_lo + c))) - f); + { + /* 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; + } } diff --git a/sysdeps/ieee754/flt-32/s_log1pf.c b/sysdeps/ieee754/flt-32/s_log1pf.c index ade60a2e27..009084ee19 100644 --- a/sysdeps/ieee754/flt-32/s_log1pf.c +++ b/sysdeps/ieee754/flt-32/s_log1pf.c @@ -16,6 +16,7 @@ #include <float.h> #include <math.h> #include <math_private.h> +#include <libc-diag.h> static const float ln2_hi = 6.9313812256e-01, /* 0x3f317180 */ @@ -97,6 +98,18 @@ __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; + } } |