diff options
Diffstat (limited to 'contrib/llvm-project/compiler-rt/lib/builtins/i386/floatdidf.S')
| -rw-r--r-- | contrib/llvm-project/compiler-rt/lib/builtins/i386/floatdidf.S | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/contrib/llvm-project/compiler-rt/lib/builtins/i386/floatdidf.S b/contrib/llvm-project/compiler-rt/lib/builtins/i386/floatdidf.S new file mode 100644 index 000000000000..d588e770364e --- /dev/null +++ b/contrib/llvm-project/compiler-rt/lib/builtins/i386/floatdidf.S @@ -0,0 +1,43 @@ +// 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 + +#include "../assembly.h" + +// double __floatdidf(du_int a); + +#ifdef __i386__ + +CONST_SECTION + + .balign 16 +twop52: + .quad 0x4330000000000000 + + .balign 16 +twop32: + .quad 0x41f0000000000000 + +#define REL_ADDR(_a) (_a)-0b(%eax) + +.text +.balign 4 +DEFINE_COMPILERRT_FUNCTION(__floatdidf) + cvtsi2sd 8(%esp), %xmm1 + movss 4(%esp), %xmm0 // low 32 bits of a + calll 0f +0: popl %eax + mulsd REL_ADDR(twop32), %xmm1 // a_hi as a double (without rounding) + movsd REL_ADDR(twop52), %xmm2 // 0x1.0p52 + subsd %xmm2, %xmm1 // a_hi - 0x1p52 (no rounding occurs) + orpd %xmm2, %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(__floatdidf) + +#endif // __i386__ + +NO_EXEC_STACK_DIRECTIVE + |