1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt -passes=licm < %s -S | FileCheck %s 3; RUN: opt -aa-pipeline=basic-aa -passes='require<aa>,require<target-ir>,require<scalar-evolution>,require<opt-remark-emit>,loop-mssa(licm)' < %s -S | FileCheck %s 4 5define void @test1(i1 %cond, ptr %ptr) { 6; CHECK-LABEL: @test1( 7; CHECK-NEXT: entry: 8; CHECK-NEXT: [[TMP0:%.*]] = call ptr @llvm.invariant.start.p0(i64 4, ptr [[PTR:%.*]]) 9; CHECK-NEXT: [[VAL:%.*]] = load i32, ptr [[PTR]], align 4 10; CHECK-NEXT: br label [[LOOP:%.*]] 11; CHECK: loop: 12; CHECK-NEXT: [[X:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[X_INC:%.*]], [[LOOP]] ] 13; CHECK-NEXT: [[X_INC]] = add i32 [[X]], [[VAL]] 14; CHECK-NEXT: br label [[LOOP]] 15; 16 17entry: 18 br label %loop 19 20loop: 21 %x = phi i32 [ 0, %entry ], [ %x.inc, %loop ] 22 call ptr @llvm.invariant.start.p0(i64 4, ptr %ptr) 23 %val = load i32, ptr %ptr 24 %x.inc = add i32 %x, %val 25 br label %loop 26} 27 28;; despite the loop varying invariant.start, we should be 29;; able to hoist the load 30define void @test2(i1 %cond, ptr %ptr) { 31; CHECK-LABEL: @test2( 32; CHECK-NEXT: entry: 33; CHECK-NEXT: [[VAL:%.*]] = load i32, ptr [[PTR:%.*]], align 4 34; CHECK-NEXT: br label [[LOOP:%.*]] 35; CHECK: loop: 36; CHECK-NEXT: [[X:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[X_INC:%.*]], [[LOOP]] ] 37; CHECK-NEXT: [[PIV:%.*]] = getelementptr i32, ptr [[PTR]], i32 [[X]] 38; CHECK-NEXT: [[TMP0:%.*]] = call ptr @llvm.invariant.start.p0(i64 4, ptr [[PIV]]) 39; CHECK-NEXT: [[X_INC]] = add i32 [[X]], [[VAL]] 40; CHECK-NEXT: br label [[LOOP]] 41; 42entry: 43 br label %loop 44 45loop: 46 %x = phi i32 [ 0, %entry ], [ %x.inc, %loop ] 47 %piv = getelementptr i32, ptr %ptr, i32 %x 48 call ptr @llvm.invariant.start.p0(i64 4, ptr %piv) 49 %val = load i32, ptr %ptr 50 %x.inc = add i32 %x, %val 51 br label %loop 52} 53 54define void @test3(i1 %cond, ptr %ptr) { 55; CHECK-LABEL: @test3( 56; CHECK-NEXT: entry: 57; CHECK-NEXT: [[TMP0:%.*]] = call ptr @llvm.invariant.start.p0(i64 4, ptr [[PTR:%.*]]) 58; CHECK-NEXT: [[VAL:%.*]] = load i32, ptr [[PTR]], align 4 59; CHECK-NEXT: [[P2:%.*]] = getelementptr i32, ptr [[PTR]], i32 1 60; CHECK-NEXT: br label [[LOOP:%.*]] 61; CHECK: loop: 62; CHECK-NEXT: [[X:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[X_INC:%.*]], [[LOOP]] ] 63; CHECK-NEXT: store volatile i32 0, ptr [[P2]], align 4 64; CHECK-NEXT: [[X_INC]] = add i32 [[X]], [[VAL]] 65; CHECK-NEXT: br label [[LOOP]] 66; 67entry: 68 br label %loop 69 70loop: 71 %x = phi i32 [ 0, %entry ], [ %x.inc, %loop ] 72 call ptr @llvm.invariant.start.p0(i64 4, ptr %ptr) 73 %val = load i32, ptr %ptr 74 %p2 = getelementptr i32, ptr %ptr, i32 1 75 store volatile i32 0, ptr %p2 76 %x.inc = add i32 %x, %val 77 br label %loop 78} 79 80; can't hoist due to init in loop, only well defined if loop exits 81; on first iteration, but we don't bother checking for that currently 82define void @test4(i1 %cond, ptr %ptr) { 83; CHECK-LABEL: @test4( 84; CHECK-NEXT: entry: 85; CHECK-NEXT: br label [[LOOP:%.*]] 86; CHECK: loop: 87; CHECK-NEXT: [[X:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[X_INC:%.*]], [[LOOP]] ] 88; CHECK-NEXT: store i32 0, ptr [[PTR:%.*]], align 4 89; CHECK-NEXT: [[TMP0:%.*]] = call ptr @llvm.invariant.start.p0(i64 4, ptr [[PTR]]) 90; CHECK-NEXT: [[X_INC]] = add i32 [[X]], 0 91; CHECK-NEXT: br label [[LOOP]] 92; 93entry: 94 br label %loop 95 96loop: 97 %x = phi i32 [ 0, %entry ], [ %x.inc, %loop ] 98 store i32 0, ptr %ptr 99 call ptr @llvm.invariant.start.p0(i64 4, ptr %ptr) 100 %val = load i32, ptr %ptr 101 %x.inc = add i32 %x, %val 102 br label %loop 103} 104 105; don't try to reason about scopes 106define void @test5(i1 %cond, ptr %ptr) { 107; CHECK-LABEL: @test5( 108; CHECK-NEXT: entry: 109; CHECK-NEXT: br label [[LOOP:%.*]] 110; CHECK: loop: 111; CHECK-NEXT: [[X:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[X_INC:%.*]], [[LOOP]] ] 112; CHECK-NEXT: store i32 0, ptr [[PTR:%.*]], align 4 113; CHECK-NEXT: [[SCOPE:%.*]] = call ptr @llvm.invariant.start.p0(i64 4, ptr [[PTR]]) 114; CHECK-NEXT: [[VAL:%.*]] = load i32, ptr [[PTR]], align 4 115; CHECK-NEXT: call void @llvm.invariant.end.p0(ptr [[SCOPE]], i64 4, ptr [[PTR]]) 116; CHECK-NEXT: [[X_INC]] = add i32 [[X]], [[VAL]] 117; CHECK-NEXT: br label [[LOOP]] 118; 119entry: 120 br label %loop 121 122loop: 123 %x = phi i32 [ 0, %entry ], [ %x.inc, %loop ] 124 store i32 0, ptr %ptr 125 %scope = call ptr @llvm.invariant.start.p0(i64 4, ptr %ptr) 126 %val = load i32, ptr %ptr 127 call void @llvm.invariant.end.p0(ptr %scope, i64 4, ptr %ptr) 128 %x.inc = add i32 %x, %val 129 br label %loop 130} 131 132declare ptr @llvm.invariant.start.p0(i64, ptr) 133declare void @llvm.invariant.end.p0(ptr, i64, ptr) 134