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111
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1 /* Verify that NRV optimizations are prohibited when the LHS is
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2 something that may be call-clobbered. */
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3 /* { dg-do compile } */
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4 /* { dg-options "-O -fdump-tree-optimized" } */
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5
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6 typedef struct { int x[20]; void *y; } S;
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7 typedef struct { int a; S b; } T;
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8 S nrv_candidate (void);
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9 void use_result (S);
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10 void make_escape (S *);
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11 void foo (void)
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12 {
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13 S result;
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14 T result_arr[10][5];
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15
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16 make_escape (&result);
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17 make_escape (&(result_arr[3][4].b));
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18
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19 /* Neither call should be allowed to use NRV optimization. */
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20 result = nrv_candidate ();
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21 result_arr[3][4].b = nrv_candidate ();
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22
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23 use_result (result);
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24 use_result (result_arr[3][4].b);
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25 }
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26
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27 /* { dg-final { scan-tree-dump-times "return slot optimization" 0 "optimized" } } */
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