diff options
Diffstat (limited to 'sysdeps/x86_64/fpu/e_logl.S')
| -rw-r--r-- | sysdeps/x86_64/fpu/e_logl.S | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/sysdeps/x86_64/fpu/e_logl.S b/sysdeps/x86_64/fpu/e_logl.S index a0bed663c8..2ba91eedfd 100644 --- a/sysdeps/x86_64/fpu/e_logl.S +++ b/sysdeps/x86_64/fpu/e_logl.S @@ -38,8 +38,12 @@ limit: .double 0.29 ENTRY(__ieee754_logl) fldln2 // log(2) fldt 8(%rsp) // x : log(2) + fxam + fnstsw fld %st // x : x : log(2) - fsubl MO(one) // x-1 : x : log(2) + testb $1, %ah + jnz 3f // in case x is NaN or +-Inf +4: fsubl MO(one) // x-1 : x : log(2) 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) @@ -53,4 +57,10 @@ ENTRY(__ieee754_logl) 2: fstp %st(0) // x : log(2) fyl2x // log(x) ret + +3: testb $4, %ah + jnz 4b // in case x is +-Inf + fstp %st(1) + fstp %st(1) + ret END (__ieee754_logl) |