atomicops.s
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- ; ***** BEGIN LICENSE BLOCK *****
- ; Source last modified: $Id: atomicops.s,v 1.1.30.3 2004/07/09 01:47:24 hubbe Exp $
- ;
- ; // Portions Copyright (c) 1995-2003 RealNetworks, Inc. All Rights Reserved.
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- ; ***** END LICENSE BLOCK *****
- //////////////////////////////////////////////////////////////////////
- //
- // atomicops.s
- // Several atomic operators, implemented in IA64 (Itanium) assembly
- //
- // Implementation Notes:
- // A work-in-progress....
- //
- //////////////////////////////////////////////////////////////////////
- //////////////////////////////////////////////////////////////////////
- // Misc. Assembler Directives
- //////////////////////////////////////////////////////////////////////
- .radix C // C-style numeric constants
- .section .text = "ax", "progbits" // read-only object code
- //////////////////////////////////////////////////////////////////////
- //
- // _HXAtomicIncRetUINT32
- // Atomically increment by 1 and return new value
- //
- // Interface:
- // extern "C" UINT32 _HXAtomicIncRetUINT32(UINT32* pNum);
- //
- // Inputs:
- // Paramaters:
- // in0 : UINT32* pNum - pointer to integer to modify
- //
- // Outputs:
- // Atomically modifies memory at *pNum:
- // *pNum = *pNum + 1
- //
- // Return value:
- // r8 : UINT32 - new value of *pNum
- //
- //////////////////////////////////////////////////////////////////////
- .proc _HXAtomicIncRetUINT32
- .global _HXAtomicIncRetUINT32
- _HXAtomicIncRetUINT32:
- alloc loc0 = ar.pfs, 1, 1, 0, 0 //one input, one local
- fetchadd4.acq r8 = [in0], 1;; //increment *plock
- add r8 = 1, r8;; //update local copy
- br.ret.dptk.few rp;; //return new value
- .endp _HXAtomicIncRetUINT32
- //////////////////////////////////////////////////////////////////////
- //
- // _HXAtomicDecRetUINT32
- // Atomically decrement by 1 and return new value
- //
- // Interface:
- // extern "C" UINT32 _HXAtomicDecRetUINT32(UINT32* pNum);
- //
- // Inputs:
- // Paramaters:
- // in0 : UINT32* pNum - pointer to integer to modify
- //
- // Outputs:
- // Atomically modifies memory at *pNum:
- // *pNum = *pNum - 1
- //
- // Return value:
- // r8 : UINT32 - new value of *pNum
- //
- //////////////////////////////////////////////////////////////////////
- .proc _HXAtomicDecRetUINT32
- .global _HXAtomicDecRetUINT32
- _HXAtomicDecRetUINT32:
- alloc loc0 = ar.pfs, 1, 1, 0, 0 //one input, one local
- fetchadd4.acq r8 = [in0], -1;; //decrement *pLock
- add r8 = -1, r8;; //update local copy
- br.ret.dptk.few rp;; //return new value
- .endp _HXAtomicDecRetUINT32
- //////////////////////////////////////////////////////////////////////
- //
- // _HXAtomicAddRetUINT32
- // Atomically add n and return new value
- //
- // Interface:
- // extern "C" UINT32 _HXAtomicAddRetUINT32(UINT32* pNum, UINT32 ulNum);
- //
- // Inputs:
- // Paramaters:
- // in0 : UINT32* pNum - pointer to integer to modify
- // in1 : UINT32 ulNum - amount to increment by
- //
- // Outputs:
- // Atomically modifies memory at *pNum:
- // *pNum = *pNum + ulNum
- //
- // Return value:
- // r8 : UINT32 - new value of *pNum
- //
- //////////////////////////////////////////////////////////////////////
- .proc _HXAtomicAddRetUINT32
- .global _HXAtomicAddRetUINT32
- _HXAtomicAddRetUINT32:
- alloc loc4 = ar.pfs, 2, 5, 0, 0 // two inputs, five locals
- mov loc3 = ar.ccv;; //save the CCV register
- atomic_back1: //
- ld4 loc0 = [in0];; //loc0 = current value of *pNum
- mov ar.ccv = loc0;; //copy it to the CCV register
- add loc1 = loc0, in1;; //compute new value
- cmpxchg4.acq r8 = [in0], loc1;; //write new val if *pLock == CCV
- cmp4.eq p1, p2 = loc0, r8;; //check success of cmpxchg4
- (p2) br.cond.dpnt.few atomic_back1;; //if p2=1 (it failed) try again
- add r8 = r8, in1;; //update local copy of *pNum
- mov ar.ccv = loc3;; //restore the CCV register
- br.ret.dptk.few rp;; //return new value of *pNum
- .endp _HXAtomicAddRetUINT32
- //////////////////////////////////////////////////////////////////////
- //
- // _HXAtomicSubRetUINT32
- // Atomically subtract n and return new value
- //
- // Interface:
- // extern "C" UINT32 _HXAtomicSubRetUINT32(UINT32* pNum, UINT32 ulNum);
- //
- // Inputs:
- // Paramaters:
- // in0 : UINT32* pNum - pointer to integer to modify
- // in1 : UINT32 ulNum - amount to increment by
- //
- // Outputs:
- // Atomically modifies memory at *pNum:
- // *pNum = *pNum + ulNum
- //
- // Return value:
- // r8 : UINT32 - new value of *pNum
- //
- //////////////////////////////////////////////////////////////////////
- .proc _HXAtomicSubRetUINT32
- .global _HXAtomicSubRetUINT32
- _HXAtomicSubRetUINT32:
- alloc loc4 = ar.pfs, 2, 5, 0, 0 // two inputs, five locals
- mov loc3 = ar.ccv;; //save the CCV register
- atomic_back2: //
- ld4 loc0 = [in0];; //loc0 = current value of *pNum
- mov ar.ccv = loc0;; //copy it to the CCV register
- sub loc1 = loc0, in1;; //compute new value
- cmpxchg4.acq r8 = [in0], loc1;; //write new val if *pLock == CCV
- cmp4.eq p1, p2 = loc0, r8;; //check success of cmpxchg4
- (p2) br.cond.dpnt.few atomic_back2;; //if p2=1 (it failed) try again
- sub r8 = r8, in1;; //update local copy of *pNum
- mov ar.ccv = loc3;; //restore the CCV register
- br.ret.dptk.few rp;; //return new value of *pNum
- .endp _HXAtomicSubRetUINT32