[rustc.git] / src / compiler-rt / lib / builtins / i386 / floatdixf.S

// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.

#include "../assembly.h"

// float __floatdixf(di_int a);

#ifdef __i386__

// This routine has some extra memory traffic, loading the 64-bit input via two
// 32-bit loads, then immediately storing it back to the stack via a single 64-bit
// store.  This is to avoid a write-small, read-large stall.
// However, if callers of this routine can be safely assumed to store the argument
// via a 64-bt store, this is unnecessary memory traffic, and should be avoided.
// It can be turned off by defining the TRUST_CALLERS_USE_64_BIT_STORES macro.

.text
.balign 4
DEFINE_COMPILERRT_FUNCTION(__floatdixf)
#ifndef TRUST_CALLERS_USE_64_BIT_STORES
	movd		4(%esp),	%xmm0
	movd		8(%esp),	%xmm1
	punpckldq	%xmm1,		%xmm0
	movq		%xmm0,		4(%esp)
#endif
	fildll		4(%esp)
	ret
END_COMPILERRT_FUNCTION(__floatdixf)

#endif // __i386__
Commit	Line	Data
1a4d82fc JJ	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 __floatdixf(di_int a);
	7
	8	#ifdef __i386__
	9
	10	// This routine has some extra memory traffic, loading the 64-bit input via two
	11	// 32-bit loads, then immediately storing it back to the stack via a single 64-bit
	12	// store. This is to avoid a write-small, read-large stall.
	13	// However, if callers of this routine can be safely assumed to store the argument
	14	// via a 64-bt store, this is unnecessary memory traffic, and should be avoided.
	15	// It can be turned off by defining the TRUST_CALLERS_USE_64_BIT_STORES macro.
	16
	17	.text
92a42be0	18	.balign 4
1a4d82fc JJ	19	DEFINE_COMPILERRT_FUNCTION(__floatdixf)
	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	ret
	28	END_COMPILERRT_FUNCTION(__floatdixf)
	29
	30	#endif // __i386__