llvm-6502/test/Transforms/Mem2Reg/2003-10-05-DeadPHIInsertion.ll
Tanya Lattner e6d5d39c07 Upgrade tests.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48538 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-19 07:28:33 +00:00

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621 B
LLVM

; Mem2reg should not insert dead PHI nodes! The naive algorithm inserts a PHI
; node in L3, even though there is no load of %A in anything dominated by L3.
; RUN: llvm-as < %s | opt -mem2reg | llvm-dis | not grep phi
define void @test(i32 %B, i1 %C) {
%A = alloca i32 ; <i32*> [#uses=4]
store i32 %B, i32* %A
br i1 %C, label %L1, label %L2
L1: ; preds = %0
store i32 %B, i32* %A
%D = load i32* %A ; <i32> [#uses=1]
call void @test( i32 %D, i1 false )
br label %L3
L2: ; preds = %0
%E = load i32* %A ; <i32> [#uses=1]
call void @test( i32 %E, i1 true )
br label %L3
L3: ; preds = %L2, %L1
ret void
}