| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| |
| #include "../assembly.h" |
| |
| // double __floatundidf(du_int a); |
| |
| #ifdef __i386__ |
| |
| #ifndef __ELF__ |
| .const |
| #endif |
| .align 4 |
| twop52: .quad 0x4330000000000000 |
| twop32: .quad 0x41f0000000000000 |
| |
| #define REL_ADDR(_a) (_a)-0b(%eax) |
| |
| .text |
| .align 4 |
| DEFINE_COMPILERRT_FUNCTION(__floatdidf) |
| cvtsi2sd 8(%esp), %xmm1 |
| movss 4(%esp), %xmm0 // low 32 bits of a |
| calll 0f |
| 0: popl %eax |
| mulsd REL_ADDR(twop32), %xmm1 // a_hi as a double (without rounding) |
| movsd REL_ADDR(twop52), %xmm2 // 0x1.0p52 |
| subsd %xmm2, %xmm1 // a_hi - 0x1p52 (no rounding occurs) |
| orpd %xmm2, %xmm0 // 0x1p52 + a_lo (no rounding occurs) |
| addsd %xmm1, %xmm0 // a_hi + a_lo (round happens here) |
| movsd %xmm0, 4(%esp) |
| fldl 4(%esp) |
| ret |
| |
| #endif // __i386__ |
