llvm-project/llvm/test/Transforms/InstCombine/2004-09-20-BadLoadCombine2.ll

26 lines
869 B
LLVM

; RUN: llvm-as < %s | opt -instcombine -mem2reg -simplifycfg | \
; RUN: llvm-dis | grep -v store | not grep {i32 1}
; Test to make sure that instcombine does not accidentally propagate the load
; into the PHI, which would break the program.
define i32 @test(i1 %C) {
entry:
%X = alloca i32 ; <i32*> [#uses=3]
%X2 = alloca i32 ; <i32*> [#uses=2]
store i32 1, i32* %X
store i32 2, i32* %X2
br i1 %C, label %cond_true.i, label %cond_continue.i
cond_true.i: ; preds = %entry
br label %cond_continue.i
cond_continue.i: ; preds = %cond_true.i, %entry
%mem_tmp.i.0 = phi i32* [ %X, %cond_true.i ], [ %X2, %entry ] ; <i32*> [#uses=1]
store i32 3, i32* %X
%tmp.3 = load i32* %mem_tmp.i.0 ; <i32> [#uses=1]
ret i32 %tmp.3
}