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https://git.code.sf.net/p/quake/quakeforge
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842125faf8
I'm not sure if it's due more to doubles or unions, but the bug was found via double. It seems the dags code generator doesn't see that the assignment to the union's double field kills the two int fields. The test passes when NOT optimizing.
41 lines
735 B
R
41 lines
735 B
R
void printf (string fmt, ...) = #0;
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# define M_PI 3.14159265358979323846
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union {
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double d;
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int i[2];
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} type_pun;
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int alias_printf (string fmt, ...);
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int
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test_alias ()
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{
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int fail = 0;
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type_pun.d = M_PI;
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fail = alias_printf ("%g %08x%08x\n", type_pun.d,
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type_pun.i[1], type_pun.i[0]);
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return fail;
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}
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int
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alias_printf (string fmt, ...)
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{
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int fail = 0;
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// this will fail on big-endian systems
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fail = (@args.list[2].integer_val != 0x54442d18
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|| @args.list[1].integer_val != 0x400921fb);
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printf ("%g %08x%08x\n",
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@args.list[0].integer_val,
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@args.list[2].integer_val,
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@args.list[1].integer_val);
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return fail;
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}
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int
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main ()
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{
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int fail = 0;
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fail |= test_alias ();
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return fail;
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}
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