1// This file is dual licensed under the MIT and the University of Illinois Open
2// Source Licenses. See LICENSE.TXT for details.
3
4#include "../assembly.h"
5
6// float __floatdisf(di_int a);
7
8// This routine has some extra memory traffic, loading the 64-bit input via two
9// 32-bit loads, then immediately storing it back to the stack via a single 64-bit
10// store.  This is to avoid a write-small, read-large stall.
11// However, if callers of this routine can be safely assumed to store the argument
12// via a 64-bt store, this is unnecessary memory traffic, and should be avoided.
13// It can be turned off by defining the TRUST_CALLERS_USE_64_BIT_STORES macro.
14
15#ifdef __i386__
16
17.text
18.balign 4
19DEFINE_COMPILERRT_FUNCTION(__floatdisf)
20#ifndef TRUST_CALLERS_USE_64_BIT_STORES
21	movd		4(%esp),	%xmm0
22	movd		8(%esp),	%xmm1
23	punpckldq	%xmm1,		%xmm0
24	movq		%xmm0,		4(%esp)
25#endif
26	fildll		4(%esp)
27	fstps		4(%esp)
28	flds		4(%esp)
29	ret
30END_COMPILERRT_FUNCTION(__floatdisf)
31
32#endif // __i386__
33