I have a question about the partial pre (-ftree-partial-pre) optimization that was added in GCC 4.8. I have noticed that this optimization is slowing down the bitmnp01 benchmark in the EEMBC1.1 suite on MIPS. I see this with the 4.8 GCC and with ToT GCC. Comparing "-O3 -fno-tree-partial-pre" vs. just "-O3" on the Tot GCC with MIPS, I see almost a 50% slowdown in the benchmark due to the partial pre optimization.
I was wondering if anyone else has seen a slowdown like this on other platforms or in other benchmarks. I haven't submitted a bugzilla report because I don't have a test case that I can include (EEMBC is licensed). Steve Ellcey sell...@mips.com
