mirror of git://gcc.gnu.org/git/gcc.git
116 lines
2.1 KiB
C
116 lines
2.1 KiB
C
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#include <complex.h>
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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 _Complex 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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double mag2_a = __real__(a) * __real__ (a) + __imag__ (a) * __imag__ (a);
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double mag2_diff = (__real__(diff) * __real__ (diff)
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+ __imag__ (diff) * __imag__ (diff));
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return mag2_diff / mag2_a < (FRAC * 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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double frac = ix * (1.0 / 1024) + 1.0;
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ary[ix] = frac + frac * 2.0i - 1.0i;
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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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