mirror of
https://github.com/autc04/Retro68.git
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77 lines
1.8 KiB
C
77 lines
1.8 KiB
C
/* This code uses nvptx inline assembly guarded with acc_on_device, which is
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not optimized away at -O0, and then confuses the target assembler.
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{ dg-skip-if "" { *-*-* } { "-O0" } { "" } } */
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#include <stdio.h>
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#include <openacc.h>
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#define NUM_WORKERS 16
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#define NUM_VECTORS 32
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#define WIDTH 64
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#define HEIGHT 32
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#define WORK_ID(I,N) \
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(acc_on_device (acc_device_nvidia) \
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? ({unsigned __r; \
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__asm__ volatile ("mov.u32 %0,%%tid.y;" : "=r" (__r)); \
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__r; }) : (I % N))
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#define VEC_ID(I,N) \
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(acc_on_device (acc_device_nvidia) \
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? ({unsigned __r; \
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__asm__ volatile ("mov.u32 %0,%%tid.x;" : "=r" (__r)); \
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__r; }) : (I % N))
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#pragma acc routine worker
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void __attribute__ ((noinline))
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WorkVec (int *ptr, int w, int h, int nw, int nv)
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{
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#pragma acc loop worker
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for (int i = 0; i < h; i++)
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#pragma acc loop vector
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for (int j = 0; j < w; j++)
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ptr[i*w + j] = (WORK_ID (i, nw) << 8) | VEC_ID(j, nv);
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}
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int DoWorkVec (int nw)
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{
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int ary[HEIGHT][WIDTH];
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int err = 0;
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for (int ix = 0; ix != HEIGHT; ix++)
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for (int jx = 0; jx != WIDTH; jx++)
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ary[ix][jx] = 0xdeadbeef;
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printf ("spawning %d ...", nw); fflush (stdout);
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#pragma acc parallel num_workers(nw) vector_length (NUM_VECTORS) copy (ary)
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{
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WorkVec ((int *)ary, WIDTH, HEIGHT, nw, NUM_VECTORS);
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}
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for (int ix = 0; ix != HEIGHT; ix++)
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for (int jx = 0; jx != WIDTH; jx++)
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{
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int exp = ((ix % nw) << 8) | (jx % NUM_VECTORS);
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if (ary[ix][jx] != exp)
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{
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printf ("\nary[%d][%d] = %#x expected %#x", ix, jx,
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ary[ix][jx], exp);
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err = 1;
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}
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}
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printf (err ? " failed\n" : " ok\n");
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return err;
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}
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int main ()
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{
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int err = 0;
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for (int W = 1; W <= NUM_WORKERS; W <<= 1)
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err |= DoWorkVec (W);
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return err;
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}
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