1 files changed, 68 insertions, 0 deletions
diff --git a/test/Transforms/DeadArgElim/multdeadretval.ll b/test/Transforms/DeadArgElim/multdeadretval.ll
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+++ b/test/Transforms/DeadArgElim/multdeadretval.ll
@@ -0,0 +1,68 @@
+; This test sees if return values (and arguments) are properly removed when they
+; are unused. All unused values are typed i16, so we can easily check. We also
+; run instcombine to fold insert/extractvalue chains and we run dce to clean up
+; any remaining dead stuff.
+; RUN: opt < %s -deadargelim -instcombine -dce -S | not grep i16
+
+define internal {i16, i32} @test(i16 %DEADARG) {
+        %A = insertvalue {i16,i32} undef, i16 1, 0
+        %B = insertvalue {i16,i32} %A, i32 1001, 1
+        ret {i16,i32} %B
+}
+
+define internal {i32, i16} @test2() {
+        %DEAD = call i16 @test4()
+        %A = insertvalue {i32,i16} undef, i32 1, 0
+        %B = insertvalue {i32,i16} %A, i16 %DEAD, 1
+        ret {i32,i16} %B
+}
+
+; Dead argument, used to check if the second result of test2 is dead even when
+; it's used as a dead argument
+define internal i32 @test3(i16 %A) {
+        %ret = call {i16, i32} @test( i16 %A )                ; <i32> [#uses=0]
+        %DEAD = extractvalue {i16, i32} %ret, 0
+        %LIVE = extractvalue {i16, i32} %ret, 1
+        ret i32 %LIVE
+}
+
+define internal i16 @test4() {
+        ret i16 0
+}
+
+; Multiple return values, multiple live return values
+define internal {i32, i32, i16} @test5() {
+        %A = insertvalue {i32,i32,i16} undef, i32 1, 0
+        %B = insertvalue {i32,i32,i16} %A, i32 2, 1
+        %C = insertvalue {i32,i32,i16} %B, i16 3, 2
+        ret {i32, i32, i16} %C
+}
+
+; Nested return values
+define internal {{i32}, {i16, i16}} @test6() {
+        %A = insertvalue {{i32}, {i16, i16}} undef, i32 1, 0, 0
+        %B = insertvalue {{i32}, {i16, i16}} %A, i16 2, 1, 0
+        %C = insertvalue {{i32}, {i16, i16}} %B, i16 3, 1, 1
+        ret {{i32}, {i16, i16}} %C
+}
+
+define i32 @main() {
+        %ret = call {i32, i16} @test2()                ; <i32> [#uses=1]
+        %LIVE = extractvalue {i32, i16} %ret, 0
+        %DEAD = extractvalue {i32, i16} %ret, 1
+        %Y = add i32 %LIVE, -123           ; <i32> [#uses=1]
+        %LIVE2 = call i32 @test3(i16 %DEAD)                ; <i32> [#uses=1]
+        %Z = add i32 %LIVE2, %Y           ; <i32> [#uses=1]
+        %ret1 = call { i32, i32, i16 } @test5 ()
+        %LIVE3 = extractvalue { i32, i32, i16} %ret1, 0
+        %LIVE4 = extractvalue { i32, i32, i16} %ret1, 1
+        %DEAD2 = extractvalue { i32, i32, i16} %ret1, 2
+        %V = add i32 %LIVE3, %LIVE4
+        %W = add i32 %Z, %V
+        %ret2 = call { { i32 }, { i16, i16 } } @test6 ()
+        %LIVE5 = extractvalue { { i32 }, { i16, i16 } } %ret2, 0, 0
+        %DEAD3 = extractvalue { { i32 }, { i16, i16 } } %ret2, 1, 0
+        %DEAD4 = extractvalue { { i32 }, { i16, i16 } } %ret2, 1, 1
+        %Q = add i32 %W, %LIVE5
+        ret i32 %Q
+}