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...---+---------+---------+-----+ |473.astar|-0.17|-0.21|2.17 | +--------------+---------+---------+-----+ |483.xalancbmk |1.35|1.63|2.27 | +--------------+---------+---------+-----+ |SUM |0.57|0.60|3.15 | +--------------+---------+---------+-----+ These measurements were collected on an Intel NUC6i5SY with an Intel Core i5-6260U CPU and 32G RAM running Clear Linux 13330. Intel Hyper-Threading, Intel Turbo Boost, and the LAN were all disabled. I used SPEC CPU2006 v1.2 and started the Clang/LLVM port from the gcc 4.6 Linux x86 example file included in the SPEC CPU 2006 kit. Here is the leg...

Hi, I previously posted about using 32-bit X86 segmentation to harden SafeStack: http://lists.llvm.org/pipermail/llvm-dev/2016-May/100346.html That involves lowering the limits of the DS and ES segments that are used for ordinary data accesses while leaving the limit for SS, the stack segment, set to its maximum value. The safe stacks were clustered above the limits of DS and ES. Thus, by