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| ; 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
| }
|
|
