[llvm] 7de4104 - [DSE] Allow DSE to optimize MemorySSA by default.
Florian Hahn via llvm-commits
llvm-commits at lists.llvm.org
Wed Dec 1 00:29:37 PST 2021
Author: Florian Hahn
Date: 2021-12-01T08:29:23Z
New Revision: 7de410440d46e83aa81aed19a4215a92798c5eb5
URL: https://github.com/llvm/llvm-project/commit/7de410440d46e83aa81aed19a4215a92798c5eb5
DIFF: https://github.com/llvm/llvm-project/commit/7de410440d46e83aa81aed19a4215a92798c5eb5.diff
LOG: [DSE] Allow DSE to optimize MemorySSA by default.
This allows for better optimization of 'stores-of-existing-values' and
possibly helps passes further down the pipeline.
Reviewed By: asbirlea
Differential Revision: https://reviews.llvm.org/D113712
Added:
Modified:
llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp
llvm/test/Transforms/DeadStoreElimination/stores-of-existing-values.ll
Removed:
################################################################################
diff --git a/llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp b/llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp
index 3646d3f3017d6..e0d3a6accadd2 100644
--- a/llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp
+++ b/llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp
@@ -166,8 +166,8 @@ static cl::opt<unsigned> MemorySSAPathCheckLimit(
// those cases, the flag can be used to check if DSE's MemorySSA optimizations
// impact follow-up passes.
static cl::opt<bool>
- OptimizeMemorySSA("dse-optimize-memoryssa", cl::init(false), cl::Hidden,
- cl::desc("Allow DSE to optimize memory accesses"));
+ OptimizeMemorySSA("dse-optimize-memoryssa", cl::init(true), cl::Hidden,
+ cl::desc("Allow DSE to optimize memory accesses."));
//===----------------------------------------------------------------------===//
// Helper functions
diff --git a/llvm/test/Transforms/DeadStoreElimination/stores-of-existing-values.ll b/llvm/test/Transforms/DeadStoreElimination/stores-of-existing-values.ll
index 7faf06c53217d..b3bc95f4c7755 100644
--- a/llvm/test/Transforms/DeadStoreElimination/stores-of-existing-values.ll
+++ b/llvm/test/Transforms/DeadStoreElimination/stores-of-existing-values.ll
@@ -1,7 +1,7 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -basic-aa -dse -dse-optimize-memoryssa=false -S %s | FileCheck --check-prefixes=CHECK,UNOPT %s
; RUN: opt -basic-aa -dse -dse-optimize-memoryssa -S %s | FileCheck --check-prefixes=CHECK,OPT %s
-; RUN: opt -basic-aa -dse -S %s | FileCheck --check-prefixes=CHECK,UNOPT %s
+; RUN: opt -basic-aa -dse -S %s | FileCheck --check-prefixes=CHECK,OPT %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
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