1 ; RUN: opt < %s -mem2reg -instcombine -S | grep store 2 ; PR590 3 4 5 define void @zero(i8* %p, i32 %n) { 6 entry: 7 %p_addr = alloca i8* ; <i8**> [#uses=2] 8 %n_addr = alloca i32 ; <i32*> [#uses=2] 9 %i = alloca i32 ; <i32*> [#uses=6] 10 %out = alloca i32 ; <i32*> [#uses=2] 11 %undef = alloca i32 ; <i32*> [#uses=2] 12 store i8* %p, i8** %p_addr 13 store i32 %n, i32* %n_addr 14 store i32 0, i32* %i 15 br label %loopentry 16 loopentry: ; preds = %endif, %entry 17 %tmp.0 = load i32* %n_addr ; <i32> [#uses=1] 18 %tmp.1 = add i32 %tmp.0, 1 ; <i32> [#uses=1] 19 %tmp.2 = load i32* %i ; <i32> [#uses=1] 20 %tmp.3 = icmp sgt i32 %tmp.1, %tmp.2 ; <i1> [#uses=2] 21 %tmp.4 = zext i1 %tmp.3 to i32 ; <i32> [#uses=0] 22 br i1 %tmp.3, label %no_exit, label %return 23 no_exit: ; preds = %loopentry 24 %tmp.5 = load i32* %undef ; <i32> [#uses=1] 25 store i32 %tmp.5, i32* %out 26 store i32 0, i32* %undef 27 %tmp.6 = load i32* %i ; <i32> [#uses=1] 28 %tmp.7 = icmp sgt i32 %tmp.6, 0 ; <i1> [#uses=2] 29 %tmp.8 = zext i1 %tmp.7 to i32 ; <i32> [#uses=0] 30 br i1 %tmp.7, label %then, label %endif 31 then: ; preds = %no_exit 32 %tmp.9 = load i8** %p_addr ; <i8*> [#uses=1] 33 %tmp.10 = load i32* %i ; <i32> [#uses=1] 34 %tmp.11 = sub i32 %tmp.10, 1 ; <i32> [#uses=1] 35 %tmp.12 = getelementptr i8* %tmp.9, i32 %tmp.11 ; <i8*> [#uses=1] 36 %tmp.13 = load i32* %out ; <i32> [#uses=1] 37 %tmp.14 = trunc i32 %tmp.13 to i8 ; <i8> [#uses=1] 38 store i8 %tmp.14, i8* %tmp.12 39 br label %endif 40 endif: ; preds = %then, %no_exit 41 %tmp.15 = load i32* %i ; <i32> [#uses=1] 42 %inc = add i32 %tmp.15, 1 ; <i32> [#uses=1] 43 store i32 %inc, i32* %i 44 br label %loopentry 45 return: ; preds = %loopentry 46 ret void 47 } 48
