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llvm-mirror/test/Transforms/InstCombine/deadcode.ll
Nick Lewycky 2f04a6b411 Lifetime intrinsics on undef are dead.
llvm-svn: 136722
2011-08-02 21:19:27 +00:00

34 lines
712 B
LLVM

; RUN: opt < %s -instcombine -S | grep {ret i32 %A}
; RUN: opt < %s -die -S | not grep call.*llvm
define i32 @test(i32 %A) {
%X = or i1 false, false
br i1 %X, label %T, label %C
T: ; preds = %0
%B = add i32 %A, 1
br label %C
C: ; preds = %T, %0
%C.upgrd.1 = phi i32 [ %B, %T ], [ %A, %0 ]
ret i32 %C.upgrd.1
}
define i32* @test2(i32 %width) {
%tmp = call i8* @llvm.stacksave( )
%tmp14 = alloca i32, i32 %width
ret i32* %tmp14
}
declare i8* @llvm.stacksave()
declare void @llvm.lifetime.start(i64, i8*)
declare void @llvm.lifetime.end(i64, i8*)
define void @test3() {
call void @llvm.lifetime.start(i64 -1, i8* undef)
call void @llvm.lifetime.end(i64 -1, i8* undef)
ret void
}