1 files changed, 108 insertions, 0 deletions
diff --git a/test/Transforms/SimplifyCFG/speculate-store.ll b/test/Transforms/SimplifyCFG/speculate-store.ll
new file mode 100644
index 0000000..8d7fe79
--- /dev/null
+++ b/test/Transforms/SimplifyCFG/speculate-store.ll
@@ -0,0 +1,108 @@
+; RUN: opt -simplifycfg -S < %s | FileCheck %s
+
+define void @ifconvertstore(i32 %m, i32* %A, i32* %B, i32 %C, i32 %D) {
+entry:
+  %arrayidx = getelementptr inbounds i32* %B, i64 0
+  %0 = load i32* %arrayidx, align 4
+  %add = add nsw i32 %0, %C
+  %arrayidx2 = getelementptr inbounds i32* %A, i64 0
+
+; First store to the location.
+  store i32 %add, i32* %arrayidx2, align 4
+  %arrayidx4 = getelementptr inbounds i32* %B, i64 1
+  %1 = load i32* %arrayidx4, align 4
+  %add5 = add nsw i32 %1, %D
+  %cmp6 = icmp sgt i32 %add5, %C
+  br i1 %cmp6, label %if.then, label %ret.end
+
+; Make sure we speculate stores like the following one. It is cheap compared to
+; a mispredicated branch.
+; CHECK: @ifconvertstore
+; CHECK: %add5.add = select i1 %cmp6, i32 %add5, i32 %add
+; CHECK: store i32 %add5.add, i32* %arrayidx2, align 4
+if.then:
+  store i32 %add5, i32* %arrayidx2, align 4
+  br label %ret.end
+
+ret.end:
+  ret void
+}
+
+define void @noifconvertstore1(i32 %m, i32* %A, i32* %B, i32 %C, i32 %D) {
+entry:
+  %arrayidx = getelementptr inbounds i32* %B, i64 0
+  %0 = load i32* %arrayidx, align 4
+  %add = add nsw i32 %0, %C
+  %arrayidx2 = getelementptr inbounds i32* %A, i64 0
+
+; Store to a different location.
+  store i32 %add, i32* %arrayidx, align 4
+  %arrayidx4 = getelementptr inbounds i32* %B, i64 1
+  %1 = load i32* %arrayidx4, align 4
+  %add5 = add nsw i32 %1, %D
+  %cmp6 = icmp sgt i32 %add5, %C
+  br i1 %cmp6, label %if.then, label %ret.end
+
+; CHECK: @noifconvertstore1
+; CHECK-NOT: select
+if.then:
+  store i32 %add5, i32* %arrayidx2, align 4
+  br label %ret.end
+
+ret.end:
+  ret void
+}
+
+declare void @unknown_fun()
+
+define void @noifconvertstore2(i32 %m, i32* %A, i32* %B, i32 %C, i32 %D) {
+entry:
+  %arrayidx = getelementptr inbounds i32* %B, i64 0
+  %0 = load i32* %arrayidx, align 4
+  %add = add nsw i32 %0, %C
+  %arrayidx2 = getelementptr inbounds i32* %A, i64 0
+
+; First store to the location.
+  store i32 %add, i32* %arrayidx2, align 4
+  call void @unknown_fun()
+  %arrayidx4 = getelementptr inbounds i32* %B, i64 1
+  %1 = load i32* %arrayidx4, align 4
+  %add5 = add nsw i32 %1, %D
+  %cmp6 = icmp sgt i32 %add5, %C
+  br i1 %cmp6, label %if.then, label %ret.end
+
+; CHECK: @noifconvertstore2
+; CHECK-NOT: select
+if.then:
+  store i32 %add5, i32* %arrayidx2, align 4
+  br label %ret.end
+
+ret.end:
+  ret void
+}
+
+define void @noifconvertstore_volatile(i32 %m, i32* %A, i32* %B, i32 %C, i32 %D) {
+entry:
+  %arrayidx = getelementptr inbounds i32* %B, i64 0
+  %0 = load i32* %arrayidx, align 4
+  %add = add nsw i32 %0, %C
+  %arrayidx2 = getelementptr inbounds i32* %A, i64 0
+
+; First store to the location.
+  store i32 %add, i32* %arrayidx2, align 4
+  %arrayidx4 = getelementptr inbounds i32* %B, i64 1
+  %1 = load i32* %arrayidx4, align 4
+  %add5 = add nsw i32 %1, %D
+  %cmp6 = icmp sgt i32 %add5, %C
+  br i1 %cmp6, label %if.then, label %ret.end
+
+; Make sure we don't speculate volatile stores.
+; CHECK: @noifconvertstore_volatile
+; CHECK-NOT: select
+if.then:
+  store volatile i32 %add5, i32* %arrayidx2, align 4
+  br label %ret.end
+
+ret.end:
+  ret void
+}