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1; XFAIL: *2; NOTE: Assertions have been autogenerated by utils/update_test_checks.py3; RUN: opt < %s -passes=mergeicmps -verify-dom-info -mtriple=x86_64-unknown-unknown -S | FileCheck %s4 5; This is a more involved test: clang generates this weird pattern for6; tuple<uint8_t, uint8_t, uint8_t, uint8_t>. Right now we skip the entry block7; (which defines the base pointer for other blocks) and the last one (which8; does not have the expected structure). Only middle blocks (bytes [1,2]) are9; 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 128; CHECK-NEXT: [[B_ELEM1_ADDR:%.*]] = getelementptr inbounds i8, ptr %b.base, i64 129; CHECK-NEXT: [[MEMCMP:%.*]] = call i32 @memcmp(ptr [[A_ELEM1_ADDR]], ptr [[B_ELEM1_ADDR]], i64 3)30; CHECK-NEXT: [[TMP2:%.*]] = icmp eq i32 [[MEMCMP]], 031; CHECK-NEXT: br label [[OPEQ_EXIT:%.*]]32; CHECK: land.elem0:33; CHECK-NEXT: [[TMP3:%.*]] = load i8, ptr [[A:%.*]], align 134; CHECK-NEXT: [[TMP4:%.*]] = load i8, ptr [[B:%.*]], align 135; 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 345 %0 = load i8, ptr %a.elem3.addr, align 146 %b.elem3.addr = getelementptr inbounds i8, ptr %b, i64 347 %1 = load i8, ptr %b.elem3.addr, align 148 %cmp.elem3 = icmp eq i8 %0, %149 br i1 %cmp.elem3, label %land.elem2, label %opeq.exit50 51land.elem2:52 %a.elem2.addr = getelementptr inbounds i8, ptr %a, i64 253 %2 = load i8, ptr %a.elem2.addr, align 154 %b.elem2.addr = getelementptr inbounds i8, ptr %b, i64 255 %3 = load i8, ptr %b.elem2.addr, align 156 %cmp.elem2 = icmp eq i8 %2, %357 br i1 %cmp.elem2, label %land.elem1, label %opeq.exit58 59land.elem1:60 %a.elem1.addr = getelementptr inbounds i8, ptr %a, i64 161 %4 = load i8, ptr %a.elem1.addr, align 162 %b.elem1.addr = getelementptr inbounds i8, ptr %b, i64 163 %5 = load i8, ptr %b.elem1.addr, align 164 %cmp.elem1 = icmp eq i8 %4, %565 br i1 %cmp.elem1, label %land.elem0, label %opeq.exit66 67land.elem0:68 %6 = load i8, ptr %a, align 169 %7 = load i8, ptr %b, align 170 %cmp.elem0 = icmp eq i8 %6, %771 br label %opeq.exit72 73opeq.exit:74 %8 = phi i1 [ false, %entry ], [ false, %land.elem2 ], [ false, %land.elem1 ], [ %cmp.elem0, %land.elem0 ]75 ret i1 %876}77 78