diff options
Diffstat (limited to 'sysdeps/x86_64')
| -rw-r--r-- | sysdeps/x86_64/fpu/e_powl.S | 27 |
1 files changed, 23 insertions, 4 deletions
diff --git a/sysdeps/x86_64/fpu/e_powl.S b/sysdeps/x86_64/fpu/e_powl.S index 4a7f3a18d3..2b36077a32 100644 --- a/sysdeps/x86_64/fpu/e_powl.S +++ b/sysdeps/x86_64/fpu/e_powl.S @@ -184,9 +184,15 @@ ENTRY(__ieee754_powl) 30: fldt 8(%rsp) // x : y fldl MO(one) // 1.0 : x : y fucomip %st(1),%st // x : y - je 31f - fxch // y : x -31: fstp %st(1) + je 32f +31: /* At least one argument NaN, and result should be NaN. */ + faddp + ret +32: jc 31b + /* pow (1, NaN); check if the NaN signaling. */ + testb $0x40, 31(%rsp) + jz 31b + fstp %st(1) ret .align ALIGNARG(4) @@ -217,12 +223,24 @@ ENTRY(__ieee754_powl) cfi_adjust_cfa_offset (-40) ret - // pow(x,±0) = 1 + // pow(x,±0) = 1, unless x is sNaN .align ALIGNARG(4) 11: fstp %st(0) // pop y + fldt 8(%rsp) // x + fxam + fnstsw + andb $0x45, %ah + cmpb $0x01, %ah + je 112f // x is NaN +111: fstp %st(0) fldl MO(one) ret +112: testb $0x40, 15(%rsp) + jnz 111b + fadd %st(0) + ret + // y == ±inf .align ALIGNARG(4) 12: fstp %st(0) // pop y @@ -255,6 +273,7 @@ ENTRY(__ieee754_powl) .align ALIGNARG(4) 13: fldt 8(%rsp) // load x == NaN + fadd %st(0) ret .align ALIGNARG(4) |