[PATCH] D77404: [AssumeBundles] preserve knowledge in DSE

[Tyker via Phabricator via llvm-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rG086de7673e3d: [AssumeBundles] preserve knowledge in DSE (authored by Tyker).

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D77404/new/

https://reviews.llvm.org/D77404

Files:
  llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp
  llvm/test/Transforms/DeadStoreElimination/MSSA/simple-preservation.ll


Index: llvm/test/Transforms/DeadStoreElimination/MSSA/simple-preservation.ll
===================================================================
--- /dev/null
+++ llvm/test/Transforms/DeadStoreElimination/MSSA/simple-preservation.ll
@@ -0,0 +1,17 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -aa-pipeline=basic-aa -passes=dse -enable-dse-memoryssa -enable-knowledge-retention -S | FileCheck %s
+
+target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
+
+define void @test1(i32* %Q, i32* %P) {
+; CHECK-LABEL: @test1(
+; CHECK-NEXT:    call void @llvm.assume(i1 true) [ "dereferenceable"(i32* [[Q:%.*]], i64 4), "nonnull"(i32* [[Q]]) ]
+; CHECK-NEXT:    call void @llvm.assume(i1 true) [ "dereferenceable"(i32* [[P:%.*]], i64 4), "nonnull"(i32* [[P]]) ]
+; CHECK-NEXT:    store i32 0, i32* [[P]]
+; CHECK-NEXT:    ret void
+;
+  %DEAD = load i32, i32* %Q
+  store i32 %DEAD, i32* %P
+  store i32 0, i32* %P
+  ret void
+}
Index: llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp
===================================================================
--- llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp
+++ llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp
@@ -63,6 +63,7 @@
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Transforms/Scalar.h"
 #include "llvm/Transforms/Utils/Local.h"
+#include "llvm/Transforms/Utils/AssumeBundleBuilder.h"
 #include <algorithm>
 #include <cassert>
 #include <cstddef>
@@ -144,6 +145,7 @@
 
     // Try to preserve debug information attached to the dead instruction.
     salvageDebugInfoOrMarkUndef(*DeadInst);
+    salvageKnowledge(DeadInst);
 
     // This instruction is dead, zap it, in stages.  Start by removing it from
     // MemDep, which needs to know the operands and needs it to be in the
@@ -1729,6 +1731,7 @@
 
       // Try to preserve debug information attached to the dead instruction.
       salvageDebugInfo(*DeadInst);
+      salvageKnowledge(DeadInst);
 
       // Remove the Instruction from MSSA.
       if (MemoryAccess *MA = MSSA.getMemoryAccess(DeadInst)) {


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