?? ssa-pre-15.c
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/* { dg-do compile } *//* { dg-options "-O2 -fdump-tree-optimized" } *//* Verify we PRE the strlen call, as strlen("") folds to zero. */extern __SIZE_TYPE__ strlen (const char *);__SIZE_TYPE__ mystrlen (const char *s){ if (!s) s = ""; return strlen(s);}/* { dg-final { scan-tree-dump "= 0;" "optimized" } } *//* { dg-final { cleanup-tree-dump "optimized" } } */?? 快捷鍵說明
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