diff options
Diffstat (limited to 'includes')
| -rw-r--r-- | includes/stg/SMP.h | 42 |
1 files changed, 21 insertions, 21 deletions
diff --git a/includes/stg/SMP.h b/includes/stg/SMP.h index 01663dd86e..00608c707c 100644 --- a/includes/stg/SMP.h +++ b/includes/stg/SMP.h @@ -107,7 +107,10 @@ EXTERN_INLINE StgWord xchg(StgPtr p, StgWord w) { StgWord result; -#if i386_HOST_ARCH || x86_64_HOST_ARCH +#if defined(NOSMP) + result = *p; + *p = w; +#elif i386_HOST_ARCH || x86_64_HOST_ARCH result = w; __asm__ __volatile__ ( // NB: the xchg instruction is implicitly locked, so we do not @@ -154,9 +157,6 @@ xchg(StgPtr p, StgWord w) : "r" (w), "r" (p) : "memory" ); -#elif !defined(WITHSMP) - result = *p; - *p = w; #else #error xchg() unimplemented on this architecture #endif @@ -170,7 +170,14 @@ xchg(StgPtr p, StgWord w) EXTERN_INLINE StgWord cas(StgVolatilePtr p, StgWord o, StgWord n) { -#if i386_HOST_ARCH || x86_64_HOST_ARCH +#if defined(NOSMP) + StgWord result; + result = *p; + if (result == o) { + *p = n; + } + return result; +#elif i386_HOST_ARCH || x86_64_HOST_ARCH __asm__ __volatile__ ( "lock\ncmpxchg %3,%1" :"=a"(o), "+m" (*(volatile unsigned int *)p) @@ -225,13 +232,6 @@ cas(StgVolatilePtr p, StgWord o, StgWord n) : "cc","memory"); return result; -#elif !defined(WITHSMP) - StgWord result; - result = *p; - if (result == o) { - *p = n; - } - return result; #else #error cas() unimplemented on this architecture #endif @@ -302,7 +302,9 @@ busy_wait_nop(void) */ EXTERN_INLINE void write_barrier(void) { -#if i386_HOST_ARCH || x86_64_HOST_ARCH +#if defined(NOSMP) + return; +#elif i386_HOST_ARCH || x86_64_HOST_ARCH __asm__ __volatile__ ("" : : : "memory"); #elif powerpc_HOST_ARCH __asm__ __volatile__ ("lwsync" : : : "memory"); @@ -313,8 +315,6 @@ write_barrier(void) { __asm__ __volatile__ ("" : : : "memory"); #elif arm_HOST_ARCH && !defined(arm_HOST_ARCH_PRE_ARMv7) __asm__ __volatile__ ("dmb st" : : : "memory"); -#elif !defined(WITHSMP) - return; #else #error memory barriers unimplemented on this architecture #endif @@ -322,7 +322,9 @@ write_barrier(void) { EXTERN_INLINE void store_load_barrier(void) { -#if i386_HOST_ARCH +#if defined(NOSMP) + return; +#elif i386_HOST_ARCH __asm__ __volatile__ ("lock; addl $0,0(%%esp)" : : : "memory"); #elif x86_64_HOST_ARCH __asm__ __volatile__ ("lock; addq $0,0(%%rsp)" : : : "memory"); @@ -332,8 +334,6 @@ store_load_barrier(void) { __asm__ __volatile__ ("membar #StoreLoad" : : : "memory"); #elif arm_HOST_ARCH && !defined(arm_HOST_ARCH_PRE_ARMv7) __asm__ __volatile__ ("dmb" : : : "memory"); -#elif !defined(WITHSMP) - return; #else #error memory barriers unimplemented on this architecture #endif @@ -341,7 +341,9 @@ store_load_barrier(void) { EXTERN_INLINE void load_load_barrier(void) { -#if i386_HOST_ARCH +#if defined(NOSMP) + return; +#elif i386_HOST_ARCH __asm__ __volatile__ ("" : : : "memory"); #elif x86_64_HOST_ARCH __asm__ __volatile__ ("" : : : "memory"); @@ -352,8 +354,6 @@ load_load_barrier(void) { __asm__ __volatile__ ("" : : : "memory"); #elif arm_HOST_ARCH && !defined(arm_HOST_ARCH_PRE_ARMv7) __asm__ __volatile__ ("dmb" : : : "memory"); -#elif !defined(WITHSMP) - return; #else #error memory barriers unimplemented on this architecture #endif |