1 ; RUN: llc < %s -mcpu=atom -mtriple=i686-linux | FileCheck %s 2 ; CHECK:BB#5 3 ; CHECK-NEXT:leal 4 ; CHECK-NEXT:leal 5 ; CHECK-NEXT:leal 6 ; CHECK-NEXT:movl 7 8 9 ; Test for fixup lea pre-emit pass. LEA instructions should be substituted for 10 ; ADD instructions which compute the address and index of the load because they 11 ; precede the load within 5 instructions. An LEA should also be substituted for 12 ; an ADD which computes part of the index because it precedes the index LEA 13 ; within 5 instructions, this substitution is referred to as backwards chaining. 14 15 ; Original C Code 16 ;struct node_t 17 ;{ 18 ; int k, m, n, p; 19 ; int * array; 20 ;}; 21 22 ;extern struct node_t getnode(); 23 24 ;int test() 25 ;{ 26 ; int sum = 0; 27 ; struct node_t n = getnode(); 28 ; if(n.array != 0 && n.p > 0 && n.k > 0 && n.n > 0 && n.m > 0) { 29 ; sum = ((int*)((int)n.array + n.p) )[ n.k + n.m + n.n ]; 30 ; } 31 ; return sum; 32 ;} 33 34 %struct.node_t = type { i32, i32, i32, i32, i32* } 35 36 define i32 @test() { 37 entry: 38 %n = alloca %struct.node_t, align 4 39 call void bitcast (void (%struct.node_t*, ...)* @getnode to void (%struct.node_t*)*)(%struct.node_t* sret %n) 40 %array = getelementptr inbounds %struct.node_t, %struct.node_t* %n, i32 0, i32 4 41 %0 = load i32*, i32** %array, align 4 42 %cmp = icmp eq i32* %0, null 43 br i1 %cmp, label %if.end, label %land.lhs.true 44 45 land.lhs.true: 46 %p = getelementptr inbounds %struct.node_t, %struct.node_t* %n, i32 0, i32 3 47 %1 = load i32, i32* %p, align 4 48 %cmp1 = icmp sgt i32 %1, 0 49 br i1 %cmp1, label %land.lhs.true2, label %if.end 50 51 land.lhs.true2: 52 %k = getelementptr inbounds %struct.node_t, %struct.node_t* %n, i32 0, i32 0 53 %2 = load i32, i32* %k, align 4 54 %cmp3 = icmp sgt i32 %2, 0 55 br i1 %cmp3, label %land.lhs.true4, label %if.end 56 57 land.lhs.true4: 58 %n5 = getelementptr inbounds %struct.node_t, %struct.node_t* %n, i32 0, i32 2 59 %3 = load i32, i32* %n5, align 4 60 %cmp6 = icmp sgt i32 %3, 0 61 br i1 %cmp6, label %land.lhs.true7, label %if.end 62 63 land.lhs.true7: 64 %m = getelementptr inbounds %struct.node_t, %struct.node_t* %n, i32 0, i32 1 65 %4 = load i32, i32* %m, align 4 66 %cmp8 = icmp sgt i32 %4, 0 67 br i1 %cmp8, label %if.then, label %if.end 68 69 if.then: 70 %add = add i32 %3, %2 71 %add12 = add i32 %add, %4 72 %5 = ptrtoint i32* %0 to i32 73 %add15 = add nsw i32 %1, %5 74 %6 = inttoptr i32 %add15 to i32* 75 %arrayidx = getelementptr inbounds i32, i32* %6, i32 %add12 76 %7 = load i32, i32* %arrayidx, align 4 77 br label %if.end 78 79 if.end: 80 %sum.0 = phi i32 [ %7, %if.then ], [ 0, %land.lhs.true7 ], [ 0, %land.lhs.true4 ], [ 0, %land.lhs.true2 ], [ 0, %land.lhs.true ], [ 0, %entry ] 81 ret i32 %sum.0 82 } 83 84 declare void @getnode(%struct.node_t* sret, ...) 85
