Commit regression test distilled from 20963
From-SVN: r98222
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/* { dg-do compile } */
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/* { dg-options "-O2" } */
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/* This was causing PRE to insert the value of the ADDR variable, to
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remove the invariant cast but in doing so, it was creating a
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non-invariant expression out of the invariant one, causing a later
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failure in PRE. */
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struct sMCB {
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unsigned char type;
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};
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extern void foo (void);
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unsigned char mem_readb(char *pt) __attribute__((nothrow));
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void DOS_FreeProcessMemory(unsigned short pspseg) {
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while (1) {
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if (pspseg)
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foo ();
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char *addr = (char*)(&((sMCB*)0)->type);
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if (mem_readb(addr)==0x5a) break;
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}
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};
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