Import LLVM, at r72732.vendor/llvm/llvm-r72732

1 files changed, 20 insertions, 0 deletions

diff --git a/test/CodeGen/X86/2006-01-19-ISelFoldingBug.ll b/test/CodeGen/X86/2006-01-19-ISelFoldingBug.ll
new file mode 100644
index 000000000000..817b281243e7
--- /dev/null
+++ b/test/CodeGen/X86/2006-01-19-ISelFoldingBug.ll
@@ -0,0 +1,20 @@
+; RUN: llvm-as < %s | llc -march=x86 | \
+; RUN:   grep shld | count 1
+;
+; Check that the isel does not fold the shld, which already folds a load
+; and has two uses, into a store.
+
+@A = external global i32                ; <i32*> [#uses=2]
+
+define i32 @test5(i32 %B, i8 %C) {
+        %tmp.1 = load i32* @A           ; <i32> [#uses=1]
+        %shift.upgrd.1 = zext i8 %C to i32              ; <i32> [#uses=1]
+        %tmp.2 = shl i32 %tmp.1, %shift.upgrd.1         ; <i32> [#uses=1]
+        %tmp.3 = sub i8 32, %C          ; <i8> [#uses=1]
+        %shift.upgrd.2 = zext i8 %tmp.3 to i32          ; <i32> [#uses=1]
+        %tmp.4 = lshr i32 %B, %shift.upgrd.2            ; <i32> [#uses=1]
+        %tmp.5 = or i32 %tmp.4, %tmp.2          ; <i32> [#uses=2]
+        store i32 %tmp.5, i32* @A
+        ret i32 %tmp.5
+}
+