1 // This file is dual licensed under the MIT and the University of Illinois Open
2 // Source Licenses. See LICENSE.TXT for details.
4 #include "../assembly.h"
6 // double __floatundidf(du_int a);
14 .quad 0x4330000000000000
18 .quad 0x41f0000000000000
20 #define REL_ADDR(_a) (_a)-0b(%eax)
24 DEFINE_COMPILERRT_FUNCTION(__floatdidf)
25 cvtsi2sd 8(%esp), %xmm1
26 movss 4(%esp), %xmm0 // low 32 bits of a
29 mulsd REL_ADDR(twop32), %xmm1 // a_hi as a double (without rounding)
30 movsd REL_ADDR(twop52), %xmm2 // 0x1.0p52
31 subsd %xmm2, %xmm1 // a_hi - 0x1p52 (no rounding occurs)
32 orpd %xmm2, %xmm0 // 0x1p52 + a_lo (no rounding occurs)
33 addsd %xmm1, %xmm0 // a_hi + a_lo (round happens here)
37 END_COMPILERRT_FUNCTION(__floatdidf)
41 NO_EXEC_STACK_DIRECTIVE