Add a test case for -optimize-ext-uses.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44928 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CodeGen/X86/opt-ext-uses.ll b/test/CodeGen/X86/opt-ext-uses.ll
new file mode 100644 (file)
index 0000000..faa9be7
--- /dev/null
+++ b/test/CodeGen/X86/opt-ext-uses.ll
@@ -0,0 +1,19 @@
+; RUN: llvm-as < %s | llc -march=x86 -optimize-ext-uses=true | grep movw | count 1
+
+define i16 @t() signext  {
+entry:
+        %tmp180 = load i16* null, align 2               ; <i16> [#uses=3]
+        %tmp180181 = sext i16 %tmp180 to i32            ; <i32> [#uses=1]
+        %tmp182 = add i16 %tmp180, 10
+        %tmp185 = icmp slt i16 %tmp182, 0               ; <i1> [#uses=1]
+        br i1 %tmp185, label %cond_true188, label %cond_next245
+
+cond_true188:           ; preds = %entry
+        %tmp195196 = trunc i16 %tmp180 to i8            ; <i8> [#uses=0]
+        ret i16 %tmp180
+
+cond_next245:           ; preds = %entry
+        %tmp256 = and i32 %tmp180181, 15                ; <i32> [#uses=0]
+        %tmp3 = trunc i32 %tmp256 to i16
+        ret i16 %tmp3
+}