mirror of
https://github.com/autc04/Retro68.git
synced 2024-09-10 03:54:48 +00:00
113 lines
1.9 KiB
C
113 lines
1.9 KiB
C
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/* Double float has 53 bits of fraction. */
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#define FRAC (1.0 / (1LL << 48))
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typedef double Type;
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int close_enough (Type a, Type b)
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{
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Type diff = a - b;
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if (diff < 0)
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diff = -diff;
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return diff / a < FRAC;
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}
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#define N 100
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static int __attribute__ ((noinline))
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vector (Type ary[N], Type sum, Type prod)
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{
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Type tsum = 0, tprod = 1;
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#pragma acc parallel vector_length(32) copyin(ary[0:N])
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{
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#pragma acc loop vector reduction(+:tsum) reduction (*:tprod)
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for (int ix = 0; ix < N; ix++)
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{
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tsum += ary[ix];
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tprod *= ary[ix];
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}
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}
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if (!close_enough (sum, tsum))
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return 1;
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if (!close_enough (prod, tprod))
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return 1;
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return 0;
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}
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static int __attribute__ ((noinline))
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worker (Type ary[N], Type sum, Type prod)
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{
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Type tsum = 0, tprod = 1;
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#pragma acc parallel num_workers(32) copyin(ary[0:N])
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{
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#pragma acc loop worker reduction(+:tsum) reduction (*:tprod)
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for (int ix = 0; ix < N; ix++)
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{
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tsum += ary[ix];
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tprod *= ary[ix];
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}
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}
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if (!close_enough (sum, tsum))
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return 1;
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if (!close_enough (prod, tprod))
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return 1;
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return 0;
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}
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static int __attribute__ ((noinline))
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gang (Type ary[N], Type sum, Type prod)
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{
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Type tsum = 0, tprod = 1;
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#pragma acc parallel num_gangs (32) copyin(ary[0:N])
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{
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#pragma acc loop gang reduction(+:tsum) reduction (*:tprod)
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for (int ix = 0; ix < N; ix++)
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{
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tsum += ary[ix];
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tprod *= ary[ix];
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}
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}
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if (!close_enough (sum, tsum))
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return 1;
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if (!close_enough (prod, tprod))
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return 1;
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return 0;
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}
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int main (void)
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{
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Type ary[N], sum = 0, prod = 1;
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for (int ix = 0; ix < N; ix++)
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{
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float frac = ix * (1.0f / 1024) + 1.0f;
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ary[ix] = frac;
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sum += ary[ix];
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prod *= ary[ix];
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}
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if (vector (ary, sum, prod))
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return 1;
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if (worker (ary, sum, prod))
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return 1;
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if (gang (ary, sum, prod))
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return 1;
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return 0;
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}
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