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Since a, b, and c are globals, how does the optimize *know* they are not used elsewhere (e.g. another module)? On Fri, Jan 4, 2013 at 7:49 AM, Somenath Chakraborty <some.chak at gmail.com>wrote: > Hello, > > I was trying to run few testcases and see how llvm optmizes different > scenarios. I have a small testcase like: > > > #include <stdio.h> > > >

...ki at gmail.com> wrote: > Since a, b, and c are globals, how does the optimize *know* they are not > used elsewhere (e.g. another module)? > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20130104/ae1a8bdc/attachment.html>

Hello, I was trying to run few testcases and see how llvm optmizes different scenarios. I have a small testcase like: #include <stdio.h> int a, b, c; int main() { a = b + c; c = a; if (a == b) b = c; else b = a; printf( " a = %d \n ", a ); return 0; } The corresponding llvm IR is ( clang test.c -S -emit-llvm -o -