On 12/12/13 12:19, Steve Ellcey wrote:
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).
See BZ38785
jeff
