diff options
Diffstat (limited to 'lib/i386/floatundidf.s')
| -rw-r--r-- | lib/i386/floatundidf.s | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/lib/i386/floatundidf.s b/lib/i386/floatundidf.s new file mode 100644 index 000000000..d9be85343 --- /dev/null +++ b/lib/i386/floatundidf.s @@ -0,0 +1,43 @@ +//===-- floatundidf.s - Implement __floatundidf for i386 ------------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file implements __floatundidf for the compiler_rt library. +// +//===----------------------------------------------------------------------===// + +// double __floatundidf(du_int a); + +#ifdef __i386__ + +.const +.align 4 +twop52: .quad 0x4330000000000000 +twop84_plus_twop52: + .quad 0x4530000000100000 +twop84: .quad 0x4530000000000000 + +#define REL_ADDR(_a) (_a)-0b(%eax) + +.text +.align 4 +.globl ___floatundidf +___floatundidf: + movss 8(%esp), %xmm1 // high 32 bits of a + movss 4(%esp), %xmm0 // low 32 bits of a + calll 0f +0: popl %eax + orpd REL_ADDR(twop84), %xmm1 // 0x1p84 + a_hi (no rounding occurs) + subsd REL_ADDR(twop84_plus_twop52), %xmm1 // a_hi - 0x1p52 (no rounding occurs) + orpd REL_ADDR(twop52), %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__ |