1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt -O1 -S < %s | FileCheck %s 3; RUN: opt -passes='default<O1>' -S < %s | FileCheck %s 4 5; Don't simplify unconditional branches from empty blocks in simplifyCFG 6; until late in the pipeline because it can destroy canonical loop structure. 7 8define i1 @PR33605(i32 %a, i32 %b, ptr %c) { 9; CHECK-LABEL: @PR33605( 10; CHECK-NEXT: entry: 11; CHECK-NEXT: [[OR:%.*]] = or i32 [[B:%.*]], [[A:%.*]] 12; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds nuw i8, ptr [[C:%.*]], i64 4 13; CHECK-NEXT: [[TMP0:%.*]] = load i32, ptr [[ARRAYIDX]], align 4 14; CHECK-NEXT: [[CMP:%.*]] = icmp ne i32 [[OR]], [[TMP0]] 15; CHECK-NEXT: br i1 [[CMP]], label [[IF_THEN:%.*]], label [[IF_END:%.*]] 16; CHECK: if.then: 17; CHECK-NEXT: store i32 [[OR]], ptr [[ARRAYIDX]], align 4 18; CHECK-NEXT: tail call void @foo() 19; CHECK-NEXT: br label [[IF_END]] 20; CHECK: if.end: 21; CHECK-NEXT: [[TMP1:%.*]] = load i32, ptr [[C]], align 4 22; CHECK-NEXT: [[CMP_1:%.*]] = icmp eq i32 [[OR]], [[TMP1]] 23; CHECK-NEXT: br i1 [[CMP_1]], label [[IF_END_1:%.*]], label [[IF_THEN_1:%.*]] 24; CHECK: if.then.1: 25; CHECK-NEXT: store i32 [[OR]], ptr [[C]], align 4 26; CHECK-NEXT: tail call void @foo() 27; CHECK-NEXT: br label [[IF_END_1]] 28; CHECK: if.end.1: 29; CHECK-NEXT: [[CHANGED_1_OFF0_1:%.*]] = phi i1 [ true, [[IF_THEN_1]] ], [ [[CMP]], [[IF_END]] ] 30; CHECK-NEXT: ret i1 [[CHANGED_1_OFF0_1]] 31; 32entry: 33 br label %for.cond 34 35for.cond: 36 %i.0 = phi i32 [ 2, %entry ], [ %dec, %if.end ] 37 %changed.0.off0 = phi i1 [ false, %entry ], [ %changed.1.off0, %if.end ] 38 %dec = add nsw i32 %i.0, -1 39 %tobool = icmp eq i32 %i.0, 0 40 br i1 %tobool, label %for.cond.cleanup, label %for.body 41 42for.cond.cleanup: 43 %changed.0.off0.lcssa = phi i1 [ %changed.0.off0, %for.cond ] 44 ret i1 %changed.0.off0.lcssa 45 46for.body: 47 %or = or i32 %a, %b 48 %idxprom = sext i32 %dec to i64 49 %arrayidx = getelementptr inbounds i32, ptr %c, i64 %idxprom 50 %0 = load i32, ptr %arrayidx, align 4 51 %cmp = icmp eq i32 %or, %0 52 br i1 %cmp, label %if.end, label %if.then 53 54if.then: 55 store i32 %or, ptr %arrayidx, align 4 56 call void @foo() 57 br label %if.end 58 59if.end: 60 %changed.1.off0 = phi i1 [ true, %if.then ], [ %changed.0.off0, %for.body ] 61 br label %for.cond 62} 63 64declare void @foo() 65 66; PR34603 - https://bugs.llvm.org/show_bug.cgi?id=34603 67; We should have a select of doubles, not a select of double pointers. 68; SimplifyCFG should not flatten this before early-cse has a chance to eliminate redundant ops. 69 70define double @max_of_loads(ptr %x, ptr %y, i64 %i) { 71; CHECK-LABEL: @max_of_loads( 72; CHECK-NEXT: entry: 73; CHECK-NEXT: [[XI_PTR:%.*]] = getelementptr double, ptr [[X:%.*]], i64 [[I:%.*]] 74; CHECK-NEXT: [[YI_PTR:%.*]] = getelementptr double, ptr [[Y:%.*]], i64 [[I]] 75; CHECK-NEXT: [[XI:%.*]] = load double, ptr [[XI_PTR]], align 8 76; CHECK-NEXT: [[YI:%.*]] = load double, ptr [[YI_PTR]], align 8 77; CHECK-NEXT: [[CMP:%.*]] = fcmp ogt double [[XI]], [[YI]] 78; CHECK-NEXT: [[XI_YI:%.*]] = select i1 [[CMP]], double [[XI]], double [[YI]] 79; CHECK-NEXT: ret double [[XI_YI]] 80; 81entry: 82 %xi_ptr = getelementptr double, ptr %x, i64 %i 83 %yi_ptr = getelementptr double, ptr %y, i64 %i 84 %xi = load double, ptr %xi_ptr 85 %yi = load double, ptr %yi_ptr 86 %cmp = fcmp ogt double %xi, %yi 87 br i1 %cmp, label %if, label %else 88 89if: 90 %xi_ptr_again = getelementptr double, ptr %x, i64 %i 91 %xi_again = load double, ptr %xi_ptr_again 92 br label %end 93 94else: 95 %yi_ptr_again = getelementptr double, ptr %y, i64 %i 96 %yi_again = load double, ptr %yi_ptr_again 97 br label %end 98 99end: 100 %max = phi double [ %xi_again, %if ], [ %yi_again, %else ] 101 ret double %max 102} 103 104define i1 @PR58313(i1 %lhs, i1 %rhs) { 105; CHECK-LABEL: @PR58313( 106; CHECK-NEXT: andandend: 107; CHECK-NEXT: [[SPEC_SELECT:%.*]] = xor i1 [[LHS:%.*]], [[RHS:%.*]] 108; CHECK-NEXT: ret i1 [[SPEC_SELECT]] 109; 110andandend: 111 %0 = xor i1 %rhs, true 112 %andandval = select i1 %lhs, i1 %0, i1 false 113 br i1 %andandval, label %ororend, label %oror 114 115oror: 116 %1 = xor i1 %lhs, true 117 %andandval3 = select i1 %1, i1 %rhs, i1 false 118 br label %ororend 119 120ororend: 121 %ororval = phi i1 [ true, %andandend ], [ %andandval3, %oror ] 122 ret i1 %ororval 123} 124 125