[llvm] b458d8c - [DSE,MSSA] Add additional tests with non-removable stores (NFC).

[Florian Hahn via llvm-commits]

Author: Florian Hahn
Date: 2020-06-22T16:22:25+01:00
New Revision: b458d8ce95115dcb98a43bfa6ba4f2f4dbc3c083

URL: https://github.com/llvm/llvm-project/commit/b458d8ce95115dcb98a43bfa6ba4f2f4dbc3c083
DIFF: https://github.com/llvm/llvm-project/commit/b458d8ce95115dcb98a43bfa6ba4f2f4dbc3c083.diff

LOG: [DSE,MSSA] Add additional tests with non-removable stores (NFC).

Add a few additional tests with volatile stores, which cannot be
removedt stas.

Added: 
    

Modified: 
    llvm/test/Transforms/DeadStoreElimination/MSSA/simple.ll

Removed: 
    


################################################################################
diff  --git a/llvm/test/Transforms/DeadStoreElimination/MSSA/simple.ll b/llvm/test/Transforms/DeadStoreElimination/MSSA/simple.ll
index 6eff9b8cd9a1..2a96b194911d 100644
--- a/llvm/test/Transforms/DeadStoreElimination/MSSA/simple.ll
+++ b/llvm/test/Transforms/DeadStoreElimination/MSSA/simple.ll
@@ -610,3 +610,54 @@ entry:
   store atomic i8 3, i8* %P2 unordered, align 4
   ret void
 }
+
+; Some tests where volatile may block removing a store.
+define void @test44_volatile(i32* %P) {
+; CHECK-LABEL: @test44_volatile(
+; CHECK-NEXT:    store i32 1, i32* [[P:%.*]], align 4
+; CHECK-NEXT:    store volatile i32 2, i32* [[P]], align 4
+; CHECK-NEXT:    store i32 3, i32* [[P]], align 4
+; CHECK-NEXT:    ret void
+;
+  store i32 1, i32* %P, align 4
+  store volatile i32 2, i32* %P, align 4
+  store i32 3, i32* %P, align 4
+  ret void
+}
+
+define void @test45_volatile(i32* %P) {
+; CHECK-LABEL: @test45_volatile(
+; CHECK-NEXT:    store i32 1, i32* [[P:%.*]], align 4
+; CHECK-NEXT:    store volatile i32 2, i32* [[P]], align 4
+; CHECK-NEXT:    store volatile i32 3, i32* [[P]], align 4
+; CHECK-NEXT:    ret void
+;
+  store i32 1, i32* %P, align 4
+  store volatile i32 2, i32* %P, align 4
+  store volatile i32 3, i32* %P, align 4
+  ret void
+}
+
+define void @test46_volatile(i32* %P) {
+; CHECK-LABEL: @test46_volatile(
+; CHECK-NEXT:    store volatile i32 2, i32* [[P:%.*]], align 4
+; CHECK-NEXT:    store i32 1, i32* [[P]], align 4
+; CHECK-NEXT:    store volatile i32 3, i32* [[P]], align 4
+; CHECK-NEXT:    ret void
+;
+  store volatile i32 2, i32* %P, align 4
+  store i32 1, i32* %P, align 4
+  store volatile i32 3, i32* %P, align 4
+  ret void
+}
+
+define void @test47_volatile(i32* %P) {
+; CHECK-LABEL: @test47_volatile(
+; CHECK-NEXT:    store volatile i32 2, i32* [[P:%.*]], align 4
+; CHECK-NEXT:    store volatile i32 3, i32* [[P]], align 4
+; CHECK-NEXT:    ret void
+;
+  store volatile i32 2, i32* %P, align 4
+  store volatile i32 3, i32* %P, align 4
+  ret void
+}