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2074e1320f
This patch handles the strided update in the `#pragma omp target update from(data[a:b:c])` directive where 'c' represents the strided access leading to non-contiguous update in the `data` array when the offloaded execution returns the control back to host from device using the `from` clause. Issue: Clang CodeGen where info is generated for the particular `MapType` (to, from, etc), it was failing to detect the strided access. Because of this, the `MapType` bits were incorrect when passed to runtime. This led to incorrect execution (contiguous) in the libomptarget runtime code. Added a minimal testcase that verifies the working of the patch.
64 lines
1.4 KiB
C
64 lines
1.4 KiB
C
// This test checks that #pragma omp target update from(data[0:4:3]) correctly
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// updates every third element (stride 3) from the device to the host, partially
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// across the array
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// RUN: %libomptarget-compile-run-and-check-generic
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#include <omp.h>
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#include <stdio.h>
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int main() {
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int len = 11;
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double data[len];
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#pragma omp target map(tofrom : data[0 : len])
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{
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for (int i = 0; i < len; i++)
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data[i] = i;
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}
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// Initial values
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printf("original host array values:\n");
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for (int i = 0; i < len; i++)
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printf("%f\n", data[i]);
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printf("\n");
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#pragma omp target data map(to : data[0 : len])
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{
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// Modify arrays on device
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#pragma omp target
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for (int i = 0; i < len; i++)
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data[i] += i;
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#pragma omp target update from(data[0 : 4 : 3]) // indices 0,3,6,9
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}
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printf("device array values after update from:\n");
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for (int i = 0; i < len; i++)
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printf("%f\n", data[i]);
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printf("\n");
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// CHECK: 0.000000
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// CHECK: 1.000000
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// CHECK: 2.000000
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// CHECK: 3.000000
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// CHECK: 4.000000
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// CHECK: 5.000000
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// CHECK: 6.000000
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// CHECK: 7.000000
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// CHECK: 8.000000
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// CHECK: 9.000000
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// CHECK: 10.000000
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// CHECK: 0.000000
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// CHECK: 1.000000
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// CHECK: 2.000000
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// CHECK: 6.000000
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// CHECK: 4.000000
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// CHECK: 5.000000
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// CHECK: 12.000000
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// CHECK: 7.000000
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// CHECK: 8.000000
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// CHECK: 18.000000
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// CHECK: 10.000000
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}
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