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3fd07d4f04
Together with the preparatory compiler patches, this patch restores unrolling in std::__find_if, but this time relying on the compiler to do it by using: #pragma GCC unroll 4 which should restore the majority of the regression relative to the hand-unrolled version while still being vectorizable with WIP alignment peeling enhancements. On Neoverse V1 with LTO, this reduces the regression in xalancbmk (from SPEC CPU 2017) from 5.8% to 1.7% (restoring ~71% of the lost performance). libstdc++-v3/ChangeLog: PR libstdc++/116140 * include/bits/stl_algobase.h (std::__find_if): Add #pragma to request GCC to unroll the loop. |
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