1 files changed, 32 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/alloca.ll b/test/Transforms/InstCombine/alloca.ll
new file mode 100644
index 0000000..b9add4d
--- /dev/null
+++ b/test/Transforms/InstCombine/alloca.ll
@@ -0,0 +1,32 @@
+; Zero byte allocas should be deleted.
+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"
+
+; RUN: opt < %s -instcombine -S | \
+; RUN:   not grep alloca
+; END.
+
+declare void @use(...)
+
+define void @test() {
+        %X = alloca [0 x i32]           ; <[0 x i32]*> [#uses=1]
+        call void (...)* @use( [0 x i32]* %X )
+        %Y = alloca i32, i32 0          ; <i32*> [#uses=1]
+        call void (...)* @use( i32* %Y )
+        %Z = alloca {  }                ; <{  }*> [#uses=1]
+        call void (...)* @use( {  }* %Z )
+        ret void
+}
+
+define void @test2() {
+        %A = alloca i32         ; <i32*> [#uses=1]
+        store i32 123, i32* %A
+        ret void
+}
+
+define void @test3() {
+        %A = alloca { i32 }             ; <{ i32 }*> [#uses=1]
+        %B = getelementptr { i32 }* %A, i32 0, i32 0            ; <i32*> [#uses=1]
+        store i32 123, i32* %B
+        ret void
+}
+