diff options
Diffstat (limited to 'compiler-rt/lib/builtins/i386/floatundidf.S')
-rw-r--r-- | compiler-rt/lib/builtins/i386/floatundidf.S | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/compiler-rt/lib/builtins/i386/floatundidf.S b/compiler-rt/lib/builtins/i386/floatundidf.S new file mode 100644 index 000000000000..8b1b666ce1ec --- /dev/null +++ b/compiler-rt/lib/builtins/i386/floatundidf.S @@ -0,0 +1,54 @@ +//===-- floatundidf.S - Implement __floatundidf for i386 ------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// +// +// This file implements __floatundidf for the compiler_rt library. +// +//===----------------------------------------------------------------------===// + +#include "../assembly.h" + +// double __floatundidf(du_int a); + +#ifdef __i386__ + +CONST_SECTION + + .balign 16 +twop52: + .quad 0x4330000000000000 + + .balign 16 +twop84_plus_twop52: + .quad 0x4530000000100000 + + .balign 16 +twop84: + .quad 0x4530000000000000 + +#define REL_ADDR(_a) (_a)-0b(%eax) + +.text +.balign 4 +DEFINE_COMPILERRT_FUNCTION(__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 +END_COMPILERRT_FUNCTION(__floatundidf) + +#endif // __i386__ + +NO_EXEC_STACK_DIRECTIVE + |