https://llvm.org/bugs/show_bug.cgi?id=27993
Bug ID: 27993 Summary: wrong code at -O2 and -O3 in 32-bit mode on x86_64-linux-gnu Product: clang Version: trunk Hardware: PC OS: All Status: NEW Severity: normal Priority: P Component: -New Bugs Assignee: unassignedclangb...@nondot.org Reporter: s...@cs.ucdavis.edu CC: llvm-bugs@lists.llvm.org Classification: Unclassified The following code is miscompiled by the current clang trunk on x86_64-linux-gnu at -O2 and -O3 in the 32-bit mode (but not in the 64-bit mode). This is a regression from 3.8.x. $ clang-trunk -v clang version 3.9.0 (trunk 271236) Target: x86_64-unknown-linux-gnu Thread model: posix InstalledDir: /usr/local/bin Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.4 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7.3 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.4 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.3 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.3.0 Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9 Candidate multilib: .;@m64 Candidate multilib: 32;@m32 Candidate multilib: x32;@mx32 Selected multilib: .;@m64 $ $ clang-trunk -m32 -Os small.c; ./a.out $ clang-3.8 -m32 -O2 small.c; ./a.out $ clang-trunk -m64 -O2 small.c; ./a.out $ $ clang-trunk -m32 -O2 small.c $ ./a.out 00 $ ---------------------------------------------- int a = 1, c, d, e, f, g; char h; char fn1 (char p1, int p2) { return p1 > 1 || p1 > p2 ? p1 : p1 << p2; } static int fn2 (long long p1, char p2) { if (p1 < p2) fn2 (f, f); c = h; return h; } int fn3 () { int i = fn1 (a, 3); g = fn2 (a, a); c = h; return i; } int main () { if (fn3 () < 8) __builtin_printf ("%d%d\n", d, e); return 0; } -- You are receiving this mail because: You are on the CC list for the bug.
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