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Performance improvements for global min/max atomics. Issue #57.

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Compute a "local" min/max across the active program instances and 
  then do a single atomic memory op.
Added a few tests to exercise global min/max atomics (which were
  previously untested!)
This commit is contained in:
Matt Pharr
2011-08-26 10:35:24 -07:00
parent 54ec56c81d
commit 606cbab0d4
4 changed files with 80 additions and 16 deletions
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28
stdlib.ispc
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@@ -583,10 +583,22 @@ static inline TA atomic_##OPA##_global(uniform reference TA ref, TA value) { \
return ret; \
}
#define DEFINE_ATOMIC_MINMAX_OP(TA,TB,OPA,OPB) \
static inline TA atomic_##OPA##_global(uniform reference TA ref, TA value) { \
uniform TA oneval = reduce_##OPA(value); \
TA ret; \
if (lanemask() != 0) { \
memory_barrier(); \
ret = __atomic_##OPB##_##TB##_global(ref, oneval, __mask); \
memory_barrier(); \
} \
return ret; \
}
DEFINE_ATOMIC_OP(int32,int32,add,add)
DEFINE_ATOMIC_OP(int32,int32,subtract,sub)
DEFINE_ATOMIC_OP(int32,int32,min,min)
DEFINE_ATOMIC_OP(int32,int32,max,max)
DEFINE_ATOMIC_MINMAX_OP(int32,int32,min,min)
DEFINE_ATOMIC_MINMAX_OP(int32,int32,max,max)
DEFINE_ATOMIC_OP(int32,int32,and,and)
DEFINE_ATOMIC_OP(int32,int32,or,or)
DEFINE_ATOMIC_OP(int32,int32,xor,xor)
@@ -596,8 +608,8 @@ DEFINE_ATOMIC_OP(int32,int32,swap,swap)
// implementations for unsigned as for signed.
DEFINE_ATOMIC_OP(unsigned int32,int32,add,add)
DEFINE_ATOMIC_OP(unsigned int32,int32,subtract,sub)
DEFINE_ATOMIC_OP(unsigned int32,uint32,min,umin)
DEFINE_ATOMIC_OP(unsigned int32,uint32,max,umax)
DEFINE_ATOMIC_MINMAX_OP(unsigned int32,uint32,min,umin)
DEFINE_ATOMIC_MINMAX_OP(unsigned int32,uint32,max,umax)
DEFINE_ATOMIC_OP(unsigned int32,int32,and,and)
DEFINE_ATOMIC_OP(unsigned int32,int32,or,or)
DEFINE_ATOMIC_OP(unsigned int32,int32,xor,xor)
@@ -607,8 +619,8 @@ DEFINE_ATOMIC_OP(float,float,swap,swap)
DEFINE_ATOMIC_OP(int64,int64,add,add)
DEFINE_ATOMIC_OP(int64,int64,subtract,sub)
DEFINE_ATOMIC_OP(int64,int64,min,min)
DEFINE_ATOMIC_OP(int64,int64,max,max)
DEFINE_ATOMIC_MINMAX_OP(int64,int64,min,min)
DEFINE_ATOMIC_MINMAX_OP(int64,int64,max,max)
DEFINE_ATOMIC_OP(int64,int64,and,and)
DEFINE_ATOMIC_OP(int64,int64,or,or)
DEFINE_ATOMIC_OP(int64,int64,xor,xor)
@@ -618,8 +630,8 @@ DEFINE_ATOMIC_OP(int64,int64,swap,swap)
// implementations for unsigned as for signed.
DEFINE_ATOMIC_OP(unsigned int64,int64,add,add)
DEFINE_ATOMIC_OP(unsigned int64,int64,subtract,sub)
DEFINE_ATOMIC_OP(unsigned int64,uint64,min,umin)
DEFINE_ATOMIC_OP(unsigned int64,uint64,max,umax)
DEFINE_ATOMIC_MINMAX_OP(unsigned int64,uint64,min,umin)
DEFINE_ATOMIC_MINMAX_OP(unsigned int64,uint64,max,umax)
DEFINE_ATOMIC_OP(unsigned int64,int64,and,and)
DEFINE_ATOMIC_OP(unsigned int64,int64,or,or)
DEFINE_ATOMIC_OP(unsigned int64,int64,xor,xor)