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| author | Joseph Myers <joseph@codesourcery.com> | 2012-03-02 15:32:56 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2012-03-02 15:32:56 +0000 |
| commit | a6d06d7b86f724046b462115556d0df682f9f703 (patch) | |
| tree | 640870a7d978c8a224fe317e862b65fddba6f40e /sysdeps/ieee754/ldbl-128ibm/s_scalbnl.c | |
| parent | 07e12bb391ae84eb74817d42feda42cff7f687e5 (diff) | |
| download | glibc-a6d06d7b86f724046b462115556d0df682f9f703.tar.gz glibc-a6d06d7b86f724046b462115556d0df682f9f703.tar.xz glibc-a6d06d7b86f724046b462115556d0df682f9f703.zip | |
Fix scalbn, scalbln integer overflow.
Diffstat (limited to 'sysdeps/ieee754/ldbl-128ibm/s_scalbnl.c')
| -rw-r--r-- | sysdeps/ieee754/ldbl-128ibm/s_scalbnl.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/sysdeps/ieee754/ldbl-128ibm/s_scalbnl.c b/sysdeps/ieee754/ldbl-128ibm/s_scalbnl.c index a52cd42f0b..48102efcf5 100644 --- a/sysdeps/ieee754/ldbl-128ibm/s_scalbnl.c +++ b/sysdeps/ieee754/ldbl-128ibm/s_scalbnl.c @@ -52,10 +52,12 @@ long double __scalbnl (long double x, int n) k = ((hx>>52)&0x7ff) - 54; } else if (k==0x7ff) return x+x; /* NaN or Inf */ - k = k+n; - if (n> 50000 || k > 0x7fe) - return huge*__copysignl(huge,x); /* overflow */ if (n< -50000) return tiny*__copysignl(tiny,x); /*underflow */ + if (n> 50000 || k+n > 0x7fe) + return huge*__copysignl(huge,x); /* overflow */ + /* Now k and n are bounded we know that k = k+n does not + overflow. */ + k = k+n; if (k > 0) { /* normal result */ hx = (hx&0x800fffffffffffffULL)|(k<<52); if ((lx & 0x7fffffffffffffffULL) == 0) { /* low part +-0 */ |