| ; 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 -passes='deadargelim,function(instcombine),function(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 |
| } |