diff options
Diffstat (limited to 'sysdeps/i386')
| -rw-r--r-- | sysdeps/i386/fpu/e_logl.S | 5 | ||||
| -rw-r--r-- | sysdeps/i386/i686/fpu/e_logl.S | 5 |
2 files changed, 8 insertions, 2 deletions
diff --git a/sysdeps/i386/fpu/e_logl.S b/sysdeps/i386/fpu/e_logl.S index edae1d70df..828e98aa8d 100644 --- a/sysdeps/i386/fpu/e_logl.S +++ b/sysdeps/i386/fpu/e_logl.S @@ -40,8 +40,11 @@ ENTRY(__ieee754_logl) fld %st // x : x : log(2) sahf jc 3f // in case x is NaN or +-Inf + movzwl 4+8(%esp), %eax + cmpl $0xc000, %eax + jae 6f // x <= -2, avoid overflow from -LDBL_MAX - 1. 4: fsubl MO(one) // x-1 : x : log(2) - fld %st // x-1 : x-1 : x : log(2) +6: fld %st // x-1 : x-1 : x : log(2) fabs // |x-1| : x-1 : x : log(2) fcompl MO(limit) // x-1 : x : log(2) fnstsw // x-1 : x : log(2) diff --git a/sysdeps/i386/i686/fpu/e_logl.S b/sysdeps/i386/i686/fpu/e_logl.S index a0d1107dc0..0ccc8fc71e 100644 --- a/sysdeps/i386/i686/fpu/e_logl.S +++ b/sysdeps/i386/i686/fpu/e_logl.S @@ -39,8 +39,11 @@ ENTRY(__ieee754_logl) LOAD_PIC_REG (dx) #endif fld %st // x : x : log(2) + movzwl 4+8(%esp), %eax + cmpl $0xc000, %eax + jae 5f // x <= -2, avoid overflow from -LDBL_MAX - 1. fsubl MO(one) // x-1 : x : log(2) - fld %st // x-1 : x-1 : x : log(2) +5: fld %st // x-1 : x-1 : x : log(2) fabs // |x-1| : x-1 : x : log(2) fld MO(limit) // 0.29 : |x-1| : x-1 : x : log(2) fcomip %st(1) // |x-1| : x-1 : x : log(2) |