29 lines
780 B
C
29 lines
780 B
C
/* Verify that NRV optimizations are prohibited when the LHS is
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something that may be call-clobbered. */
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/* { dg-do compile } */
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/* { dg-options "-O -fdump-tree-optimized" } */
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typedef struct { int x[20]; void *y; } S;
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typedef struct { int a; S b; } T;
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S nrv_candidate (void);
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void use_result (S);
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void make_escape (S *);
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void foo (void)
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{
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S result;
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T result_arr[10][5];
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make_escape (&result);
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make_escape (&(result_arr[3][4].b));
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/* Neither call should be allowed to use NRV optimization. */
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result = nrv_candidate ();
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result_arr[3][4].b = nrv_candidate ();
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use_result (result);
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use_result (result_arr[3][4].b);
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}
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/* { dg-final { scan-tree-dump-times "return slot optimization" 0 "optimized" } } */
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/* { dg-final { cleanup-tree-dump "optimized" } } */
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