1; RUN: opt < %s -passes=gvn -S | FileCheck %s 2 3target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128" 4target triple = "i386-apple-darwin7" 5 6define i32 @test1(ptr %b, ptr %c) nounwind { 7; CHECK-LABEL: @test1( 8entry: 9 %g = alloca i32 10 %t1 = icmp eq ptr %b, null 11 br i1 %t1, label %bb, label %bb1 12 13bb: 14 %t2 = load i32, ptr %c, align 4 15 %t3 = add i32 %t2, 1 16 store i32 %t3, ptr %g, align 4 17 br label %bb2 18 19bb1: ; preds = %entry 20 %t5 = load i32, ptr %b, align 4 21 %t6 = add i32 %t5, 1 22 store i32 %t6, ptr %g, align 4 23 br label %bb2 24 25bb2: ; preds = %bb1, %bb 26 %c_addr.0 = phi ptr [ %g, %bb1 ], [ %c, %bb ] 27 %b_addr.0 = phi ptr [ %b, %bb1 ], [ %g, %bb ] 28 %cv = load i32, ptr %c_addr.0, align 4 29 %bv = load i32, ptr %b_addr.0, align 4 30; CHECK: %bv = phi i32 31; CHECK: %cv = phi i32 32; CHECK-NOT: load 33; CHECK: ret i32 34 %ret = add i32 %cv, %bv 35 ret i32 %ret 36} 37 38define i8 @test2(i1 %cond, ptr %b, ptr %c) nounwind { 39; CHECK-LABEL: @test2( 40entry: 41 br i1 %cond, label %bb, label %bb1 42 43bb: 44 store i8 4, ptr %b 45 br label %bb2 46 47bb1: 48 store i8 92, ptr %c 49 br label %bb2 50 51bb2: 52 %d = phi ptr [ %c, %bb1 ], [ %b, %bb ] 53 %dv = load i8, ptr %d 54; CHECK: %dv = phi i8 [ 92, %bb1 ], [ 4, %bb ] 55; CHECK-NOT: load 56; CHECK: ret i8 %dv 57 ret i8 %dv 58} 59 60define i32 @test3(i1 %cond, ptr %b, ptr %c) nounwind { 61; CHECK-LABEL: @test3( 62entry: 63 br i1 %cond, label %bb, label %bb1 64 65bb: 66 %b1 = getelementptr i32, ptr %b, i32 17 67 store i32 4, ptr %b1 68 br label %bb2 69 70bb1: 71 %c1 = getelementptr i32, ptr %c, i32 7 72 store i32 82, ptr %c1 73 br label %bb2 74 75bb2: 76 %d = phi ptr [ %c, %bb1 ], [ %b, %bb ] 77 %i = phi i32 [ 7, %bb1 ], [ 17, %bb ] 78 %d1 = getelementptr i32, ptr %d, i32 %i 79 %dv = load i32, ptr %d1 80; CHECK: %dv = phi i32 [ 82, %bb1 ], [ 4, %bb ] 81; CHECK-NOT: load 82; CHECK: ret i32 %dv 83 ret i32 %dv 84} 85 86; PR5313 87define i32 @test4(i1 %cond, ptr %b, ptr %c) nounwind { 88; CHECK-LABEL: @test4( 89entry: 90 br i1 %cond, label %bb, label %bb1 91 92bb: 93 store i32 4, ptr %b 94 br label %bb2 95 96bb1: 97 %c1 = getelementptr i32, ptr %c, i32 7 98 store i32 82, ptr %c1 99 br label %bb2 100 101bb2: 102 %d = phi ptr [ %c, %bb1 ], [ %b, %bb ] 103 %i = phi i32 [ 7, %bb1 ], [ 0, %bb ] 104 %d1 = getelementptr i32, ptr %d, i32 %i 105 %dv = load i32, ptr %d1 106; CHECK: %dv = phi i32 [ 82, %bb1 ], [ 4, %bb ] 107; CHECK-NOT: load 108; CHECK: ret i32 %dv 109 ret i32 %dv 110} 111 112 113 114; void test5(int N, ptr G) { 115; for (long j = 1; j < 1000; j++) 116; G[j] = G[j] + G[j-1]; 117; } 118; 119; Should compile into one load in the loop. 120define void @test5(i32 %N, ptr nocapture %G) nounwind ssp { 121; CHECK-LABEL: @test5( 122bb.nph: 123 br label %for.body 124 125for.body: 126 %indvar = phi i64 [ 0, %bb.nph ], [ %tmp, %for.body ] 127 %arrayidx6 = getelementptr double, ptr %G, i64 %indvar 128 %tmp = add i64 %indvar, 1 129 %arrayidx = getelementptr double, ptr %G, i64 %tmp 130 %tmp3 = load double, ptr %arrayidx 131 %tmp7 = load double, ptr %arrayidx6 132 %add = fadd double %tmp3, %tmp7 133 store double %add, ptr %arrayidx 134 %exitcond = icmp eq i64 %tmp, 999 135 br i1 %exitcond, label %for.end, label %for.body 136; CHECK: for.body: 137; CHECK: phi double 138; CHECK: load double 139; CHECK-NOT: load double 140; CHECK: br i1 141for.end: 142 ret void 143} 144