forked from OSchip/llvm-project
53 lines
1.3 KiB
ArmAsm
53 lines
1.3 KiB
ArmAsm
//===-- 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__
|
|
|
|
CONST_SECTION
|
|
|
|
.balign 16
|
|
twop52:
|
|
.quad 0x4330000000000000
|
|
|
|
.balign 16
|
|
twop84_plus_twop52:
|
|
.quad 0x4530000000100000
|
|
|
|
.balign 16
|
|
twop84:
|
|
.quad 0x4530000000000000
|
|
|
|
#define REL_ADDR(_a) (_a)(%rip)
|
|
|
|
.text
|
|
.balign 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
|
|
END_COMPILERRT_FUNCTION(__floatundidf)
|
|
|
|
#endif // __x86_64__
|
|
|
|
NO_EXEC_STACK_DIRECTIVE
|
|
|