040fc92803
PR middle-end/13400 * ifcvt.c (noce_process_if_block): Disable unconditional write optimizations if we could introduce a store to trapping memory that wasn't present previously. * gcc.c-torture/execute/20031215-1.c: New test case. From-SVN: r74663
39 lines
638 B
C
39 lines
638 B
C
/* PR middle-end/13400 */
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/* The following test used to fail at run-time with a write to read-only
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memory, caused by if-conversion converting a conditional write into an
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unconditional write. */
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typedef struct {int c, l; char ch[3];} pstr;
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const pstr ao = {2, 2, "OK"};
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const pstr * const a = &ao;
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void test1(void)
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{
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if (a->ch[a->l]) {
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((char *)a->ch)[a->l] = 0;
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}
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}
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void test2(void)
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{
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if (a->ch[a->l]) {
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((char *)a->ch)[a->l] = -1;
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}
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}
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void test3(void)
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{
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if (a->ch[a->l]) {
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((char *)a->ch)[a->l] = 1;
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}
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}
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int main(void)
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{
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test1();
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test2();
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test3();
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return 0;
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}
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