From d4229601e0fb46b0a013b52370aeda3887aea8e9 Mon Sep 17 00:00:00 2001 From: Santiago Aboy Solanes Date: Tue, 3 Jan 2023 16:20:50 +0000 Subject: Add a write barrier elimination pass We can eliminate redundant write barriers as we don't need several for the same receiver. For example: ``` MyObject o; o.inner_obj = io; o.inner_obj2 = io2; o.inner_obj3 = io3; ``` We can keep the write barrier for `inner_obj` and remove the other two. Note that we cannot perform this optimization across invokes, suspend check, or instructions that can throw. Local improvements (pixel 5, speed compile): * System server: -280KB (-0.56%) * SystemUIGoogle: -330KB (-1.16%) * AGSA: -3876KB (-1.19%) Bug: 260843353 Fixes: 260843353 Change-Id: Ibf98efbe891ee00e46125853c3e97ae30aa3ff30 --- compiler/optimizing/optimization.h | 1 + 1 file changed, 1 insertion(+) (limited to 'compiler/optimizing/optimization.h') diff --git a/compiler/optimizing/optimization.h b/compiler/optimizing/optimization.h index 76960bf314..c3ba17563e 100644 --- a/compiler/optimizing/optimization.h +++ b/compiler/optimizing/optimization.h @@ -84,6 +84,7 @@ enum class OptimizationPass { kScheduling, kSelectGenerator, kSideEffectsAnalysis, + kWriteBarrierElimination, #ifdef ART_ENABLE_CODEGEN_arm kInstructionSimplifierArm, kCriticalNativeAbiFixupArm, -- cgit v1.2.3-59-g8ed1b