1 ; This test sees if return values (and arguments) are properly removed when they 2 ; are unused. All unused values are typed i16, so we can easily check. We also 3 ; run instcombine to fold insert/extractvalue chains and we run dce to clean up 4 ; any remaining dead stuff. 5 ; RUN: opt < %s -deadargelim -instcombine -dce -S | not grep i16 6 7 define internal {i16, i32} @test(i16 %DEADARG) { 8 %A = insertvalue {i16,i32} undef, i16 1, 0 9 %B = insertvalue {i16,i32} %A, i32 1001, 1 10 ret {i16,i32} %B 11 } 12 13 define internal {i32, i16} @test2() { 14 %DEAD = call i16 @test4() 15 %A = insertvalue {i32,i16} undef, i32 1, 0 16 %B = insertvalue {i32,i16} %A, i16 %DEAD, 1 17 ret {i32,i16} %B 18 } 19 20 ; Dead argument, used to check if the second result of test2 is dead even when 21 ; it's used as a dead argument 22 define internal i32 @test3(i16 %A) { 23 %ret = call {i16, i32} @test( i16 %A ) ; <i32> [#uses=0] 24 %DEAD = extractvalue {i16, i32} %ret, 0 25 %LIVE = extractvalue {i16, i32} %ret, 1 26 ret i32 %LIVE 27 } 28 29 define internal i16 @test4() { 30 ret i16 0 31 } 32 33 ; Multiple return values, multiple live return values 34 define internal {i32, i32, i16} @test5() { 35 %A = insertvalue {i32,i32,i16} undef, i32 1, 0 36 %B = insertvalue {i32,i32,i16} %A, i32 2, 1 37 %C = insertvalue {i32,i32,i16} %B, i16 3, 2 38 ret {i32, i32, i16} %C 39 } 40 41 ; Nested return values 42 define internal {{i32}, {i16, i16}} @test6() { 43 %A = insertvalue {{i32}, {i16, i16}} undef, i32 1, 0, 0 44 %B = insertvalue {{i32}, {i16, i16}} %A, i16 2, 1, 0 45 %C = insertvalue {{i32}, {i16, i16}} %B, i16 3, 1, 1 46 ret {{i32}, {i16, i16}} %C 47 } 48 49 define i32 @main() { 50 %ret = call {i32, i16} @test2() ; <i32> [#uses=1] 51 %LIVE = extractvalue {i32, i16} %ret, 0 52 %DEAD = extractvalue {i32, i16} %ret, 1 53 %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, 0 58 %LIVE4 = extractvalue { i32, i32, i16} %ret1, 1 59 %DEAD2 = extractvalue { i32, i32, i16} %ret1, 2 60 %V = add i32 %LIVE3, %LIVE4 61 %W = add i32 %Z, %V 62 %ret2 = call { { i32 }, { i16, i16 } } @test6 () 63 %LIVE5 = extractvalue { { i32 }, { i16, i16 } } %ret2, 0, 0 64 %DEAD3 = extractvalue { { i32 }, { i16, i16 } } %ret2, 1, 0 65 %DEAD4 = extractvalue { { i32 }, { i16, i16 } } %ret2, 1, 1 66 %Q = add i32 %W, %LIVE5 67 ret i32 %Q 68 } 69
