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Hello all! When I compile the following more or less stupid functions with clang++ -O3 -S test.cpp ===> int test_register(int x) { x ^= (x >> 2); x ^= (x >> 3); x = x ^ (x >> 4); int y = x; x >>= 5; x ^= y; // almost the same but explicit return x; } int test_scheduler(int x) { return ((x>>2) & 15) ^ ((x>>3) & 31); }

...4 00:08:23 server1 kernel: 0 bounce buffer pages Feb 4 00:08:23 server1 kernel: Free swap: 1052088kB Feb 4 00:08:23 server1 kernel: 253936 pages of RAM Feb 4 00:08:23 server1 kernel: 24560 pages of HIGHMEM Feb 4 00:08:23 server1 kernel: 3209 reserved pages Feb 4 00:08:23 server1 kernel: 199769 pages shared Feb 4 00:08:23 server1 kernel: 0 pages swap cached Feb 4 00:08:23 server1 kernel: kswapd0: page allocation failure. order:0, mode:0x50 Feb 4 00:08:23 server1 kernel: [<c014f863>] __alloc_pages+0x28b/0x29d Feb 4 00:08:23 server1 kernel: [<c014b70f>] find_or_create_page...