1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt < %s -passes=instcombine -S | FileCheck %s 3 4define i32 @assume_add(i32 %a, i32 %b) { 5; CHECK-LABEL: @assume_add( 6; CHECK-NEXT: [[T1:%.*]] = add i32 [[A:%.*]], [[B:%.*]] 7; CHECK-NEXT: [[LAST_TWO_DIGITS:%.*]] = and i32 [[T1]], 3 8; CHECK-NEXT: [[T2:%.*]] = icmp eq i32 [[LAST_TWO_DIGITS]], 0 9; CHECK-NEXT: call void @llvm.assume(i1 [[T2]]) 10; CHECK-NEXT: [[T3:%.*]] = or disjoint i32 [[T1]], 3 11; CHECK-NEXT: ret i32 [[T3]] 12; 13 %t1 = add i32 %a, %b 14 %last_two_digits = and i32 %t1, 3 15 %t2 = icmp eq i32 %last_two_digits, 0 16 call void @llvm.assume(i1 %t2) 17 %t3 = add i32 %t1, 3 18 ret i32 %t3 19} 20 21 22define void @assume_not() { 23; CHECK-LABEL: @assume_not( 24; CHECK-NEXT: entry-block: 25; CHECK-NEXT: [[TMP0:%.*]] = call i1 @get_val() 26; CHECK-NEXT: [[TMP1:%.*]] = xor i1 [[TMP0]], true 27; CHECK-NEXT: call void @llvm.assume(i1 [[TMP1]]) 28; CHECK-NEXT: ret void 29; 30entry-block: 31 %0 = call i1 @get_val() 32 %1 = xor i1 %0, true 33 call void @llvm.assume(i1 %1) 34 ret void 35} 36 37declare i1 @get_val() 38declare void @llvm.assume(i1) 39 40define dso_local i1 @test1(ptr readonly %0) { 41; CHECK-LABEL: @test1( 42; CHECK-NEXT: call void @llvm.assume(i1 true) [ "nonnull"(ptr [[TMP0:%.*]]) ] 43; CHECK-NEXT: ret i1 false 44; 45 call void @llvm.assume(i1 true) ["nonnull"(ptr %0)] 46 %2 = icmp eq ptr %0, null 47 ret i1 %2 48} 49 50define dso_local i1 @test2(ptr readonly %0) { 51; CHECK-LABEL: @test2( 52; CHECK-NEXT: call void @llvm.assume(i1 true) [ "nonnull"(ptr [[TMP0:%.*]]) ] 53; CHECK-NEXT: ret i1 false 54; 55 %2 = icmp eq ptr %0, null 56 call void @llvm.assume(i1 true) ["nonnull"(ptr %0)] 57 ret i1 %2 58} 59 60define dso_local i32 @test4(ptr readonly %0, i1 %cond) { 61; CHECK-LABEL: @test4( 62; CHECK-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(ptr [[TMP0:%.*]], i32 4) ] 63; CHECK-NEXT: br i1 [[COND:%.*]], label [[A:%.*]], label [[B:%.*]] 64; CHECK: B: 65; CHECK-NEXT: br label [[A]] 66; CHECK: A: 67; CHECK-NEXT: br i1 false, label [[TMP4:%.*]], label [[TMP2:%.*]] 68; CHECK: 2: 69; CHECK-NEXT: [[TMP3:%.*]] = load i32, ptr [[TMP0]], align 4 70; CHECK-NEXT: br label [[TMP4]] 71; CHECK: 4: 72; CHECK-NEXT: [[TMP5:%.*]] = phi i32 [ [[TMP3]], [[TMP2]] ], [ poison, [[A]] ] 73; CHECK-NEXT: ret i32 [[TMP5]] 74; 75 call void @llvm.assume(i1 true) ["dereferenceable"(ptr %0, i32 4)] 76 br i1 %cond, label %A, label %B 77 78B: 79 br label %A 80 81A: 82 %2 = icmp eq ptr %0, null 83 br i1 %2, label %5, label %3 84 853: ; preds = %1 86 %4 = load i32, ptr %0, align 4 87 br label %5 88 895: ; preds = %1, %3 90 %6 = phi i32 [ %4, %3 ], [ 0, %A ] 91 ret i32 %6 92} 93 94define dso_local i32 @test4a(ptr readonly %0, i1 %cond) { 95; CHECK-LABEL: @test4a( 96; CHECK-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(ptr [[TMP0:%.*]], i32 4), "align"(ptr [[TMP0]], i32 8) ] 97; CHECK-NEXT: br i1 [[COND:%.*]], label [[A:%.*]], label [[B:%.*]] 98; CHECK: B: 99; CHECK-NEXT: br label [[A]] 100; CHECK: A: 101; CHECK-NEXT: br i1 false, label [[TMP4:%.*]], label [[TMP2:%.*]] 102; CHECK: 2: 103; CHECK-NEXT: [[TMP3:%.*]] = load i32, ptr [[TMP0]], align 4 104; CHECK-NEXT: br label [[TMP4]] 105; CHECK: 4: 106; CHECK-NEXT: [[TMP5:%.*]] = phi i32 [ [[TMP3]], [[TMP2]] ], [ poison, [[A]] ] 107; CHECK-NEXT: ret i32 [[TMP5]] 108; 109 call void @llvm.assume(i1 true) ["dereferenceable"(ptr %0, i32 4), "align"(ptr %0, i32 8)] 110 br i1 %cond, label %A, label %B 111 112B: 113 br label %A 114 115A: 116 %2 = icmp eq ptr %0, null 117 br i1 %2, label %5, label %3 118 1193: ; preds = %1 120 %4 = load i32, ptr %0, align 4 121 br label %5 122 1235: ; preds = %1, %3 124 %6 = phi i32 [ %4, %3 ], [ 0, %A ] 125 ret i32 %6 126} 127 128define dso_local i32 @test4b(ptr readonly %0, i1 %cond) null_pointer_is_valid { 129; CHECK-LABEL: @test4b( 130; CHECK-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(ptr [[TMP0:%.*]], i32 4) ] 131; CHECK-NEXT: br i1 [[COND:%.*]], label [[A:%.*]], label [[B:%.*]] 132; CHECK: B: 133; CHECK-NEXT: br label [[A]] 134; CHECK: A: 135; CHECK-NEXT: [[TMP2:%.*]] = icmp eq ptr [[TMP0]], null 136; CHECK-NEXT: br i1 [[TMP2]], label [[TMP5:%.*]], label [[TMP3:%.*]] 137; CHECK: 3: 138; CHECK-NEXT: [[TMP4:%.*]] = load i32, ptr [[TMP0]], align 4 139; CHECK-NEXT: br label [[TMP5]] 140; CHECK: 5: 141; CHECK-NEXT: [[TMP6:%.*]] = phi i32 [ [[TMP4]], [[TMP3]] ], [ 0, [[A]] ] 142; CHECK-NEXT: ret i32 [[TMP6]] 143; 144 call void @llvm.assume(i1 true) ["dereferenceable"(ptr %0, i32 4)] 145 br i1 %cond, label %A, label %B 146 147B: 148 br label %A 149 150A: 151 %2 = icmp eq ptr %0, null 152 br i1 %2, label %5, label %3 153 1543: ; preds = %1 155 %4 = load i32, ptr %0, align 4 156 br label %5 157 1585: ; preds = %1, %3 159 %6 = phi i32 [ %4, %3 ], [ 0, %A ] 160 ret i32 %6 161} 162