diff options
Diffstat (limited to 'sysdeps/x86_64/fpu/s_fmax.S')
| -rw-r--r-- | sysdeps/x86_64/fpu/s_fmax.S | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/sysdeps/x86_64/fpu/s_fmax.S b/sysdeps/x86_64/fpu/s_fmax.S index 02096c0aea..0ff326fb66 100644 --- a/sysdeps/x86_64/fpu/s_fmax.S +++ b/sysdeps/x86_64/fpu/s_fmax.S @@ -27,8 +27,25 @@ ENTRY(__fmax) jmp 2f 1: ucomisd %xmm1, %xmm1 // Is xmm1 a NaN? - jp 2f // then return xmm0 + jp 3f + // xmm0 is a NaN; xmm1 is not. Test if xmm0 is signaling. + movsd %xmm0, -8(%rsp) + testb $0x8, -2(%rsp) + jz 4f movsd %xmm1, %xmm0 // otherwise return xmm1 + ret + +3: // xmm1 is a NaN; xmm0 may or may not be. + ucomisd %xmm0, %xmm0 + jp 4f + // xmm1 is a NaN; xmm0 is not. Test if xmm1 is signaling. + movsd %xmm1, -8(%rsp) + testb $0x8, -2(%rsp) + jz 4f + ret + +4: // Both arguments are NaNs, or one is a signaling NaN. + addsd %xmm1, %xmm0 2: ret END(__fmax) |