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floatundidf.S revision 1.1.1.3.4.2 
      1 //===-- floatundidf.S - Implement __floatundidf for i386 ------------------===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is dual licensed under the MIT and the University of Illinois Open
      6 // Source Licenses. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 //
     10 // This file implements __floatundidf for the compiler_rt library.
     11 //
     12 //===----------------------------------------------------------------------===//
     13 
     14 #include "../assembly.h"
     15 
     16 // double __floatundidf(du_int a);
     17 
     18 #ifdef __i386__
     19 
     20 #if defined(__APPLE__)
     21 	.const
     22 #elif defined(__ELF__)
     23 	.section .rodata
     24 #else
     25 	.section .rdata,"rd"
     26 #endif
     27 
     28 	.balign 16
     29 twop52:
     30 	.quad 0x4330000000000000
     31 
     32 	.balign 16
     33 twop84_plus_twop52:
     34 	.quad 0x4530000000100000
     35 
     36 	.balign 16
     37 twop84:
     38 	.quad 0x4530000000000000
     39 
     40 #define REL_ADDR(_a)	(_a)-0b(%eax)
     41 
     42 .text
     43 .balign 4
     44 DEFINE_COMPILERRT_FUNCTION(__floatundidf)
     45 	movss	8(%esp),						%xmm1 // high 32 bits of a
     46 	movss	4(%esp),						%xmm0 // low 32 bits of a
     47 	calll	0f
     48 0:	popl	%eax
     49 	orpd	REL_ADDR(twop84),				%xmm1 // 0x1p84 + a_hi (no rounding occurs)
     50 	subsd	REL_ADDR(twop84_plus_twop52),	%xmm1 // a_hi - 0x1p52 (no rounding occurs)
     51 	orpd	REL_ADDR(twop52),				%xmm0 // 0x1p52 + a_lo (no rounding occurs)
     52 	addsd	%xmm1,							%xmm0 // a_hi + a_lo   (round happens here)
     53 	movsd	%xmm0,						   4(%esp)
     54 	fldl   4(%esp)
     55 	ret
     56 END_COMPILERRT_FUNCTION(__floatundidf)
     57 
     58 #endif // __i386__
     59