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llvm-mirror/test/Transforms/DeadArgElim/deadretval2.ll
Dan Gohman 205b641954 Change tests from "opt %s" to "opt < %s" so that opt doesn't see the
input filename so that opt doesn't print the input filename in the
output so that grep lines in the tests don't unintentionally match
strings in the input filename.

llvm-svn: 81537
2009-09-11 18:01:28 +00:00

60 lines
1.5 KiB
LLVM

; RUN: opt < %s -deadargelim -die -S > %t
; RUN: cat %t | not grep DEAD
; RUN: cat %t | grep LIVE | count 4
@P = external global i32 ; <i32*> [#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* @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
}