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Hi, There: Clang fails to compile 254.gap @ CPU2000int suite. The symptom is that executable fail to run with reference input. The root cause is that the compiler mistakenly optimizes expr "x * y / y" into x where the x*y is blindly flagged with nsw without any analysis. The preproceeded code is excerpted bellow: cat -n integer...

...to work around the problem: http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20110131/115969.html Are you compiling without -fwrapv? Cameron On May 6, 2013, at 4:55 PM, Shuxin Yang <shuxin.llvm at gmail.com> wrote: > Hi, There: > > Clang fails to compile 254.gap @ CPU2000int suite. The symptom is that executable fail to run > with reference input. > > The root cause is that the compiler mistakenly optimizes expr "x * y / y" into x where the x*y is blindly > flagged with nsw without any analysis. > > The preproceeded code is excerpted...