1; XFAIL: * 2; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 3; RUN: opt < %s -passes=mergeicmps -verify-dom-info -mtriple=x86_64-unknown-unknown -S | FileCheck %s 4 5; This is a more involved test: clang generates this weird pattern for 6; tuple<uint8_t, uint8_t, uint8_t, uint8_t>. Right now we skip the entry block 7; (which defines the base pointer for other blocks) and the last one (which 8; does not have the expected structure). Only middle blocks (bytes [1,2]) are 9; merged. 10 11%"class.std::tuple" = type { %"struct.std::_Tuple_impl" } 12%"struct.std::_Tuple_impl" = type { %"struct.std::_Tuple_impl.0", %"struct.std::_Head_base.6" } 13%"struct.std::_Tuple_impl.0" = type { %"struct.std::_Tuple_impl.1", %"struct.std::_Head_base.5" } 14%"struct.std::_Tuple_impl.1" = type { %"struct.std::_Tuple_impl.2", %"struct.std::_Head_base.4" } 15%"struct.std::_Tuple_impl.2" = type { %"struct.std::_Head_base" } 16%"struct.std::_Head_base" = type { i8 } 17%"struct.std::_Head_base.4" = type { i8 } 18%"struct.std::_Head_base.5" = type { i8 } 19%"struct.std::_Head_base.6" = type { i8 } 20 21define zeroext i1 @opeq( 22; CHECK-LABEL: @opeq( 23; 24; These 2 instructions are split. Then we can merge 3 bytes, instead of 2. 25; CHECK: br label [[LAND_ELEM0:%.*]] 26; CHECK: land.elem1: 27; CHECK-NEXT: [[A_ELEM1_ADDR:%.*]] = getelementptr inbounds i8, ptr %a.base, i64 1 28; CHECK-NEXT: [[B_ELEM1_ADDR:%.*]] = getelementptr inbounds i8, ptr %b.base, i64 1 29; CHECK-NEXT: [[MEMCMP:%.*]] = call i32 @memcmp(ptr [[A_ELEM1_ADDR]], ptr [[B_ELEM1_ADDR]], i64 3) 30; CHECK-NEXT: [[TMP2:%.*]] = icmp eq i32 [[MEMCMP]], 0 31; CHECK-NEXT: br label [[OPEQ_EXIT:%.*]] 32; CHECK: land.elem0: 33; CHECK-NEXT: [[TMP3:%.*]] = load i8, ptr [[A:%.*]], align 1 34; CHECK-NEXT: [[TMP4:%.*]] = load i8, ptr [[B:%.*]], align 1 35; CHECK-NEXT: [[CMP_ELEM0:%.*]] = icmp eq i8 [[TMP3]], [[TMP4]] 36; CHECK-NEXT: br i1 [[CMP_ELEM0]], label [[LAND_ELEM1:%.*]], label [[OPEQ_EXIT]] 37; CHECK: opeq.exit: 38; CHECK-NEXT: [[TMP5:%.*]] = phi i1 [ [[CMP_ELEM0]], [[LAND_ELEM0]] ], [ [[TMP2]], [[LAND_ELEM1]] ] 39; CHECK-NEXT: ret i1 [[TMP5]] 40; 41 ptr nocapture readonly dereferenceable(4) %a, 42 ptr nocapture readonly dereferenceable(4) %b) local_unnamed_addr #1 { 43entry: 44 %a.elem3.addr = getelementptr inbounds i8, ptr %a, i64 3 45 %0 = load i8, ptr %a.elem3.addr, align 1 46 %b.elem3.addr = getelementptr inbounds i8, ptr %b, i64 3 47 %1 = load i8, ptr %b.elem3.addr, align 1 48 %cmp.elem3 = icmp eq i8 %0, %1 49 br i1 %cmp.elem3, label %land.elem2, label %opeq.exit 50 51land.elem2: 52 %a.elem2.addr = getelementptr inbounds i8, ptr %a, i64 2 53 %2 = load i8, ptr %a.elem2.addr, align 1 54 %b.elem2.addr = getelementptr inbounds i8, ptr %b, i64 2 55 %3 = load i8, ptr %b.elem2.addr, align 1 56 %cmp.elem2 = icmp eq i8 %2, %3 57 br i1 %cmp.elem2, label %land.elem1, label %opeq.exit 58 59land.elem1: 60 %a.elem1.addr = getelementptr inbounds i8, ptr %a, i64 1 61 %4 = load i8, ptr %a.elem1.addr, align 1 62 %b.elem1.addr = getelementptr inbounds i8, ptr %b, i64 1 63 %5 = load i8, ptr %b.elem1.addr, align 1 64 %cmp.elem1 = icmp eq i8 %4, %5 65 br i1 %cmp.elem1, label %land.elem0, label %opeq.exit 66 67land.elem0: 68 %6 = load i8, ptr %a, align 1 69 %7 = load i8, ptr %b, align 1 70 %cmp.elem0 = icmp eq i8 %6, %7 71 br label %opeq.exit 72 73opeq.exit: 74 %8 = phi i1 [ false, %entry ], [ false, %land.elem2 ], [ false, %land.elem1 ], [ %cmp.elem0, %land.elem0 ] 75 ret i1 %8 76} 77 78