[all-commits] [llvm/llvm-project] 13aa10: AArch64: use ldp/stp for 128-bit atomic load/store...
Tim Northover via All-commits
all-commits at lists.llvm.org
Mon Sep 20 01:50:23 PDT 2021
Branch: refs/heads/main
Home: https://github.com/llvm/llvm-project
Commit: 13aa102e07695297fd17f68913c343c95a7c56ad
https://github.com/llvm/llvm-project/commit/13aa102e07695297fd17f68913c343c95a7c56ad
Author: Tim Northover <t.p.northover at gmail.com>
Date: 2021-09-20 (Mon, 20 Sep 2021)
Changed paths:
M llvm/lib/Target/AArch64/AArch64.td
M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
M llvm/lib/Target/AArch64/AArch64ISelLowering.h
M llvm/lib/Target/AArch64/AArch64Subtarget.h
M llvm/lib/Target/AArch64/GISel/AArch64InstructionSelector.cpp
M llvm/lib/Target/AArch64/GISel/AArch64LegalizerInfo.cpp
M llvm/test/CodeGen/AArch64/GlobalISel/arm64-atomic-128.ll
A llvm/test/CodeGen/AArch64/GlobalISel/v8.4-atomic-128.ll
M llvm/test/CodeGen/AArch64/atomic-ops-lse.ll
A llvm/test/CodeGen/AArch64/v8.4-atomic-128.ll
Log Message:
-----------
AArch64: use ldp/stp for 128-bit atomic load/store in v.84 onwards
v8.4 says that normal loads/stores of 128-bytes are single-copy atomic if
they're properly aligned (which all LLVM atomics are) so we no longer need to
do a full RMW operation to guarantee we got a clean read.
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