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// di_int __ashldi3(di_int input, int count);
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#ifdef __SSE2__
17
18.text
19.balign 4
20DEFINE_COMPILERRT_FUNCTION(__ashldi3)
21	movd	  12(%esp),		%xmm2	// Load count
22#ifndef TRUST_CALLERS_USE_64_BIT_STORES
23	movd	   4(%esp),		%xmm0
24	movd	   8(%esp),		%xmm1
25	punpckldq	%xmm1,		%xmm0	// Load input
26#else
27	movq	   4(%esp),		%xmm0	// Load input
28#endif
29	psllq		%xmm2,		%xmm0	// shift input by count
30	movd		%xmm0,		%eax
31	psrlq		$32,		%xmm0
32	movd		%xmm0,		%edx
33	ret
34END_COMPILERRT_FUNCTION(__ashldi3)
35
36#else // Use GPRs instead of SSE2 instructions, if they aren't available.
37
38.text
39.balign 4
40DEFINE_COMPILERRT_FUNCTION(__ashldi3)
41	movl	  12(%esp),		%ecx	// Load count
42	movl	   8(%esp),		%edx	// Load high
43	movl	   4(%esp),		%eax	// Load low
44
45	testl		$0x20,		%ecx	// If count >= 32
46	jnz		1f			//    goto 1
47	shldl		%cl, %eax,	%edx	// left shift high by count
48	shll		%cl,		%eax	// left shift low by count
49	ret
50
511:	movl		%eax,		%edx	// Move low to high
52	xorl		%eax,		%eax	// clear low
53	shll		%cl,		%edx	// shift high by count - 32
54	ret
55END_COMPILERRT_FUNCTION(__ashldi3)
56
57#endif // __SSE2__
58#endif // __i386__
59