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1; This test sees if return values (and arguments) are properly removed when they2; are unused. All unused values are typed i16, so we can easily check. We also3; run instcombine to fold insert/extractvalue chains and we run dce to clean up4; any remaining dead stuff.5; RUN: opt < %s -passes='deadargelim,function(instcombine),function(dce)' -S | not grep i166 7define internal {i16, i32} @test(i16 %DEADARG) {8 %A = insertvalue {i16,i32} undef, i16 1, 09 %B = insertvalue {i16,i32} %A, i32 1001, 110 ret {i16,i32} %B11}12 13define internal {i32, i16} @test2() {14 %DEAD = call i16 @test4()15 %A = insertvalue {i32,i16} undef, i32 1, 016 %B = insertvalue {i32,i16} %A, i16 %DEAD, 117 ret {i32,i16} %B18}19 20; Dead argument, used to check if the second result of test2 is dead even when21; it's used as a dead argument22define internal i32 @test3(i16 %A) {23 %ret = call {i16, i32} @test( i16 %A ) ; <i32> [#uses=0]24 %DEAD = extractvalue {i16, i32} %ret, 025 %LIVE = extractvalue {i16, i32} %ret, 126 ret i32 %LIVE27}28 29define internal i16 @test4() {30 ret i16 031}32 33; Multiple return values, multiple live return values34define internal {i32, i32, i16} @test5() {35 %A = insertvalue {i32,i32,i16} undef, i32 1, 036 %B = insertvalue {i32,i32,i16} %A, i32 2, 137 %C = insertvalue {i32,i32,i16} %B, i16 3, 238 ret {i32, i32, i16} %C39}40 41; Nested return values42define internal {{i32}, {i16, i16}} @test6() {43 %A = insertvalue {{i32}, {i16, i16}} undef, i32 1, 0, 044 %B = insertvalue {{i32}, {i16, i16}} %A, i16 2, 1, 045 %C = insertvalue {{i32}, {i16, i16}} %B, i16 3, 1, 146 ret {{i32}, {i16, i16}} %C47}48 49define i32 @main() {50 %ret = call {i32, i16} @test2() ; <i32> [#uses=1]51 %LIVE = extractvalue {i32, i16} %ret, 052 %DEAD = extractvalue {i32, i16} %ret, 153 %Y = add i32 %LIVE, -123 ; <i32> [#uses=1]54 %LIVE2 = call i32 @test3(i16 %DEAD) ; <i32> [#uses=1]55 %Z = add i32 %LIVE2, %Y ; <i32> [#uses=1]56 %ret1 = call { i32, i32, i16 } @test5 ()57 %LIVE3 = extractvalue { i32, i32, i16} %ret1, 058 %LIVE4 = extractvalue { i32, i32, i16} %ret1, 159 %DEAD2 = extractvalue { i32, i32, i16} %ret1, 260 %V = add i32 %LIVE3, %LIVE461 %W = add i32 %Z, %V62 %ret2 = call { { i32 }, { i16, i16 } } @test6 ()63 %LIVE5 = extractvalue { { i32 }, { i16, i16 } } %ret2, 0, 064 %DEAD3 = extractvalue { { i32 }, { i16, i16 } } %ret2, 1, 065 %DEAD4 = extractvalue { { i32 }, { i16, i16 } } %ret2, 1, 166 %Q = add i32 %W, %LIVE567 ret i32 %Q68}69