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