1 ; RUN: opt < %s -instcombine -S | \ 2 ; RUN: grep select | not grep 'i32\*' 3 4 ; This testcase corresponds to PR362, which notices that this horrible code 5 ; is generated by the C++ front-end and LLVM optimizers, which has lots of 6 ; loads and other stuff that are unneeded. 7 ; 8 ; Instcombine should propagate the load through the select instructions to 9 ; allow elimination of the extra stuff by the mem2reg pass. 10 11 define void @_Z5test1RiS_(i32* %x, i32* %y) { 12 entry: 13 %tmp.1.i = load i32, i32* %y ; <i32> [#uses=1] 14 %tmp.3.i = load i32, i32* %x ; <i32> [#uses=1] 15 %tmp.4.i = icmp slt i32 %tmp.1.i, %tmp.3.i ; <i1> [#uses=1] 16 %retval.i = select i1 %tmp.4.i, i32* %y, i32* %x ; <i32*> [#uses=1] 17 %tmp.4 = load i32, i32* %retval.i ; <i32> [#uses=1] 18 store i32 %tmp.4, i32* %x 19 ret void 20 } 21 22 define void @_Z5test2RiS_(i32* %x, i32* %y) { 23 entry: 24 %tmp.0 = alloca i32 ; <i32*> [#uses=2] 25 %tmp.2 = load i32, i32* %x ; <i32> [#uses=2] 26 store i32 %tmp.2, i32* %tmp.0 27 %tmp.3.i = load i32, i32* %y ; <i32> [#uses=1] 28 %tmp.4.i = icmp slt i32 %tmp.2, %tmp.3.i ; <i1> [#uses=1] 29 %retval.i = select i1 %tmp.4.i, i32* %y, i32* %tmp.0 ; <i32*> [#uses=1] 30 %tmp.6 = load i32, i32* %retval.i ; <i32> [#uses=1] 31 store i32 %tmp.6, i32* %y 32 ret void 33 } 34 35
