| ; RUN: opt < %s -passes='deadargelim,function(dce)' -S > %t |
| ; RUN: cat %t | not grep DEAD |
| ; RUN: cat %t | grep LIVE | count 4 |
| |
| @P = external global i32 ; <ptr> [#uses=1] |
| |
| ; Dead arg only used by dead retval |
| define internal i32 @test(i32 %DEADARG) { |
| ret i32 %DEADARG |
| } |
| |
| define internal i32 @test2(i32 %DEADARG) { |
| %DEADRETVAL = call i32 @test( i32 %DEADARG ) ; <i32> [#uses=1] |
| ret i32 %DEADRETVAL |
| } |
| |
| define void @test3(i32 %X) { |
| %DEADRETVAL = call i32 @test2( i32 %X ) ; <i32> [#uses=0] |
| ret void |
| } |
| |
| define internal i32 @foo() { |
| %DEAD = load i32, ptr @P ; <i32> [#uses=1] |
| ret i32 %DEAD |
| } |
| |
| define internal i32 @id(i32 %X) { |
| ret i32 %X |
| } |
| |
| define void @test4() { |
| %DEAD = call i32 @foo( ) ; <i32> [#uses=1] |
| %DEAD2 = call i32 @id( i32 %DEAD ) ; <i32> [#uses=0] |
| ret void |
| } |
| |
| ; These test if returning another functions return value properly marks that |
| ; other function's return value as live. We do this twice, with the functions in |
| ; different orders (ie, first the caller, than the callee and first the callee |
| ; and then the caller) since DAE processes functions one by one and handles |
| ; these cases slightly different. |
| |
| define internal i32 @test5() { |
| ret i32 123 |
| } |
| |
| define i32 @test6() { |
| %LIVE = call i32 @test5() |
| ret i32 %LIVE |
| } |
| |
| define i32 @test7() { |
| %LIVE = call i32 @test8() |
| ret i32 %LIVE |
| } |
| |
| define internal i32 @test8() { |
| ret i32 124 |
| } |