| Current Path : /usr/src/contrib/compiler-rt/lib/x86_64/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //usr/src/contrib/compiler-rt/lib/x86_64/floatundidf.S |
//===-- floatundidf.S - Implement __floatundidf for x86_64 ----------------===// // // The LLVM Compiler Infrastructure // // This file is dual licensed under the MIT and the University of Illinois Open // Source Licenses. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // This file implements __floatundidf for the compiler_rt library. // //===----------------------------------------------------------------------===// #include "../assembly.h" // double __floatundidf(du_int a); #ifdef __x86_64__ #ifndef __ELF__ .const #endif .align 4 twop52: .quad 0x4330000000000000 twop84_plus_twop52: .quad 0x4530000000100000 twop84: .quad 0x4530000000000000 #define REL_ADDR(_a) (_a)(%rip) .text .align 4 DEFINE_COMPILERRT_FUNCTION(__floatundidf) movd %edi, %xmm0 // low 32 bits of a shrq $32, %rdi // high 32 bits of a orq REL_ADDR(twop84), %rdi // 0x1p84 + a_hi (no rounding occurs) orpd REL_ADDR(twop52), %xmm0 // 0x1p52 + a_lo (no rounding occurs) movd %rdi, %xmm1 subsd REL_ADDR(twop84_plus_twop52), %xmm1 // a_hi - 0x1p52 (no rounding occurs) addsd %xmm1, %xmm0 // a_hi + a_lo (round happens here) ret #endif // __x86_64__