; RUN: opt < %s -instcombine -S | \ | |
; RUN: grep select | not grep {i32\\*} | |
; This testcase corresponds to PR362, which notices that this horrible code | |
; is generated by the C++ front-end and LLVM optimizers, which has lots of | |
; loads and other stuff that are unneeded. | |
; | |
; Instcombine should propagate the load through the select instructions to | |
; allow elimination of the extra stuff by the mem2reg pass. | |
define void @_Z5test1RiS_(i32* %x, i32* %y) { | |
entry: | |
%tmp.1.i = load i32* %y ; <i32> [#uses=1] | |
%tmp.3.i = load i32* %x ; <i32> [#uses=1] | |
%tmp.4.i = icmp slt i32 %tmp.1.i, %tmp.3.i ; <i1> [#uses=1] | |
%retval.i = select i1 %tmp.4.i, i32* %y, i32* %x ; <i32*> [#uses=1] | |
%tmp.4 = load i32* %retval.i ; <i32> [#uses=1] | |
store i32 %tmp.4, i32* %x | |
ret void | |
} | |
define void @_Z5test2RiS_(i32* %x, i32* %y) { | |
entry: | |
%tmp.0 = alloca i32 ; <i32*> [#uses=2] | |
%tmp.2 = load i32* %x ; <i32> [#uses=2] | |
store i32 %tmp.2, i32* %tmp.0 | |
%tmp.3.i = load i32* %y ; <i32> [#uses=1] | |
%tmp.4.i = icmp slt i32 %tmp.2, %tmp.3.i ; <i1> [#uses=1] | |
%retval.i = select i1 %tmp.4.i, i32* %y, i32* %tmp.0 ; <i32*> [#uses=1] | |
%tmp.6 = load i32* %retval.i ; <i32> [#uses=1] | |
store i32 %tmp.6, i32* %y | |
ret void | |
} | |