forked from OSchip/llvm-project
57 lines
1.6 KiB
ArmAsm
57 lines
1.6 KiB
ArmAsm
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
|
|
// di_int __ashldi3(di_int input, int count);
|
|
|
|
// 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.
|
|
|
|
#ifdef __i386__
|
|
#ifdef __SSE2__
|
|
|
|
.text
|
|
.align 4
|
|
.globl ___ashldi3
|
|
___ashldi3:
|
|
movd 12(%esp), %xmm2 // Load count
|
|
#ifndef TRUST_CALLERS_USE_64_BIT_STORES
|
|
movd 4(%esp), %xmm0
|
|
movd 8(%esp), %xmm1
|
|
punpckldq %xmm1, %xmm0 // Load input
|
|
#else
|
|
movq 4(%esp), %xmm0 // Load input
|
|
#endif
|
|
psllq %xmm2, %xmm0 // shift input by count
|
|
movd %xmm0, %eax
|
|
psrlq $32, %xmm0
|
|
movd %xmm0, %edx
|
|
ret
|
|
|
|
#else // Use GPRs instead of SSE2 instructions, if they aren't available.
|
|
|
|
.text
|
|
.align 4
|
|
.globl ___ashldi3
|
|
___ashldi3:
|
|
movl 12(%esp), %ecx // Load count
|
|
movl 8(%esp), %edx // Load high
|
|
movl 4(%esp), %eax // Load low
|
|
|
|
testl $0x20, %ecx // If count >= 32
|
|
jnz 1f // goto 1
|
|
shldl %cl, %eax, %edx // left shift high by count
|
|
shll %cl, %eax // left shift low by count
|
|
ret
|
|
|
|
1: movl %eax, %edx // Move low to high
|
|
xorl %eax, %eax // clear low
|
|
shll %cl, %edx // shift high by count - 32
|
|
ret
|
|
|
|
#endif // __SSE2__
|
|
#endif // __i386__
|