59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
/* { dg-do compile } */
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/* { dg-options "-O2 -Wsuggest-attribute=pure -fno-finite-loops" } */
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/* { dg-add-options bind_pic_locally } */
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extern int extern_const(int a) __attribute__ ((pure));
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extern int v;
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/* Trivial. */
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int
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foo1(int a) /* { dg-bogus "normally" "detect pure candidate" } */
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{ /* { dg-warning "pure" "detect pure candidate" { target *-*-* } "10" } */
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return v;
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}
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/* Loops known to be normally and extern const calls should be safe. */
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int __attribute__ ((noinline))
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foo2(int n) /* { dg-bogus "normally" "detect pure candidate" } */
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{ /* { dg-warning "pure" "detect pure candidate" { target *-*-* } "17" } */
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int ret = 0;
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int i;
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for (i=0; i<n; i++)
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ret+=extern_const (i);
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return ret;
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}
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/* No warning here; we can work it by ourselves. */
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static int __attribute__ ((noinline))
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foo2b(int n)
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{
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int ret = 0;
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int i;
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for (i=0; i<n; i++)
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ret+=extern_const (i);
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return ret;
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}
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/* Unbounded loops are not safe. */
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static int __attribute__ ((noinline))
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foo3(unsigned int n) /* { dg-warning "pure\[^\n\]* normally" "detect pure candidate" } */
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{
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int ret = 0;
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unsigned int i;
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for (i=0; extern_const (i+n); n++)
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ret+=extern_const (i);
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return ret;
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}
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int
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foo4(int n) /* { dg-warning "pure\[^\n\]* normally" "detect pure candidate" } */
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{
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return foo3(n) + foo2b(n);
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}
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int
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foo5(int n) /* { dg-bogus "normally" "detect pure candidate" } */
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{ /* { dg-warning "pure" "detect pure candidate" { target *-*-* } "55" } */
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return foo2(n);
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}
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