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<P>The TC was compiled using clang -- clang version 3.5.0 (204114)<BR>Target: x86_64-unknown-linux-gnu<BR> compilation options: -O2</P>
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<P>------- <B>Original Message</B> -------</P>
<P><B>Sender</B> : MAYUR PANDEY<mayur.p@samsung.com> Lead Engineer/SRI-Bangalore-Native Framework/Samsung Electronics</P>
<P><B>Date</B> : Mar 18, 2014 17:19 (GMT+09:00)</P>
<P><B>Title</B> : [PATCH] Wrong output from built-in size function</P>
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<P>Hi,</P>
<P>Please find attached the fix for wrong output from built-in size function. The Testcase attached is a standard gcc testsuite TC. </P>
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<P>extern void abort (void);</P>
<P>extern inline __attribute__ ((__always_inline__)) int<BR>foo (char *dest)<BR>{<BR> return __builtin_object_size (dest, 1);<BR>}</P>
<P>struct S<BR>{<BR> union<BR> {<BR> struct { int a, b; char c, d; } f;<BR> struct { struct { int a, b; char c, d[255]; } e; } g;<BR> } u;<BR>};</P>
<P>int<BR>main (void)<BR>{<BR> struct S s;<BR> if (foo (s.u.g.e.d) != 255)<BR> abort ();<BR> return 0;<BR>}</P>
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<P>In the TC above the abort function is called as clang is unable to return correct output on calling built-in size function. the reason seems to be that in Instruction Combination pass for optimization,</P>
<P>Clang was not able to properly handle built-in size function as per new DFS implementation. So Moving it back to follow iterative way specifically for built-in size function.</P>
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<P>Please Review.</P>
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<P>Thanks,</P>
<P>Mayur</P>
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