From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- gcc/testsuite/g++.dg/opt/pr14029.C | 41 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 gcc/testsuite/g++.dg/opt/pr14029.C (limited to 'gcc/testsuite/g++.dg/opt/pr14029.C') diff --git a/gcc/testsuite/g++.dg/opt/pr14029.C b/gcc/testsuite/g++.dg/opt/pr14029.C new file mode 100644 index 000000000..1673edfd6 --- /dev/null +++ b/gcc/testsuite/g++.dg/opt/pr14029.C @@ -0,0 +1,41 @@ +// { dg-do run } +// { dg-options "-O2" } +// We used to mis-compile this testcase as we did not know that +// &a+offsetof(b,a) was the same as &a.b + +struct Iterator { + int * ptr; + + Iterator(int * i) : ptr(i) { } + void operator++() { ++ptr; } + int *const & base() const { return ptr; } +}; + + +Iterator find_7(Iterator first, Iterator last) +{ + int trip_count = (last.base() - first.base()) >> 1; + + for ( ; trip_count > 0 ; --trip_count) { + if (*first.ptr == 7) return first; + ++first; + + if (*first.ptr == 7) return first; + ++first; + } + + switch(last.base() - first.base()) { + case 1: + if (*first.ptr == 7) return first; + ++first; + case 0: + default: + return last; + } +} + +int main() { + int as[5] = {4,4,4,4,7}; + return (find_7(Iterator(&as[0]), Iterator(&as[5])).ptr == &as[5]); +}; + -- cgit v1.2.3