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Optimize non-relaxed load/store on pre-v6 ARM Linux/Android#112

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Optimize non-relaxed load/store on pre-v6 ARM Linux/Android#112
taiki-e wants to merge 1 commit intomainfrom
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@taiki-e taiki-e commented Jul 31, 2023

LLVM calls __sync_val_compare_and_swap_N/__sync_lock_test_and_set_N for them, but we can use ldr/str+__kuser_memory_barrier on Linux/Android.

This should also fix the problem that wide seqlock, which uses several acquire loads, is slower than spinlock on these targets. #82 (comment)

@taiki-e taiki-e added the O-arm Target: 32-bit Arm processors (armv6, armv7, thumb...), including 64-bit Arm in AArch32 state label Jul 31, 2023
@taiki-e taiki-e force-pushed the arm-linux branch 4 times, most recently from 0469e30 to 5b9bc15 Compare August 1, 2023 02:54
@taiki-e taiki-e force-pushed the main branch 2 times, most recently from ea83130 to 899352a Compare September 23, 2023 05:20
@taiki-e taiki-e force-pushed the arm-linux branch 2 times, most recently from 1d4e775 to 1d12abb Compare October 7, 2023 18:50
@taiki-e taiki-e force-pushed the arm-linux branch 2 times, most recently from 83b7d1c to b78d414 Compare January 3, 2024 18:13
@taiki-e taiki-e force-pushed the main branch 4 times, most recently from 5b5ecb8 to c9456c0 Compare March 9, 2024 12:29
@taiki-e taiki-e force-pushed the main branch 4 times, most recently from f16e67a to 4e66bd3 Compare April 21, 2024 10:15
@taiki-e taiki-e force-pushed the main branch 4 times, most recently from 3076fb9 to 79adf66 Compare September 8, 2024 07:03
@taiki-e taiki-e force-pushed the main branch 6 times, most recently from 023c526 to fc902d0 Compare September 20, 2024 12:53
@taiki-e taiki-e force-pushed the main branch 10 times, most recently from 51d5755 to a68d11b Compare October 4, 2024 21:07
@taiki-e taiki-e force-pushed the main branch 5 times, most recently from 6035b03 to 33b6cb5 Compare October 19, 2024 11:51
@taiki-e taiki-e force-pushed the main branch 3 times, most recently from c49dd72 to b4a720e Compare October 27, 2024 05:30
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