[LoopUnroll] Add test for llvm#80289 (NFC)

Author: nikic

llvm/test/Transforms/LoopUnroll/runtime-i128.ll

@@ -0,0 +1,72 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
+; RUN: opt -S -passes=loop-unroll -unroll-runtime < %s | FileCheck %s
+
+declare void @foo()
+
+define void @test(i128 %n, i128 %m) {
+; CHECK-LABEL: define void @test(
+; CHECK-SAME: i128 [[N:%.*]], i128 [[M:%.*]]) {
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[TMP0:%.*]] = freeze i128 [[N]]
+; CHECK-NEXT:    [[TMP1:%.*]] = add i128 [[TMP0]], 18446744073709551615
+; CHECK-NEXT:    [[XTRAITER:%.*]] = and i128 [[TMP0]], 7
+; CHECK-NEXT:    [[TMP2:%.*]] = icmp ult i128 [[TMP1]], 7
+; CHECK-NEXT:    br i1 [[TMP2]], label [[EXIT_UNR_LCSSA:%.*]], label [[ENTRY_NEW:%.*]]
+; CHECK:       entry.new:
+; CHECK-NEXT:    [[UNROLL_ITER:%.*]] = sub i128 [[TMP0]], [[XTRAITER]]
+; CHECK-NEXT:    br label [[LOOP:%.*]]
+; CHECK:       loop:
+; CHECK-NEXT:    [[IV:%.*]] = phi i128 [ 0, [[ENTRY_NEW]] ], [ [[IV_NEXT_7:%.*]], [[LOOP]] ]
+; CHECK-NEXT:    [[NITER:%.*]] = phi i128 [ 0, [[ENTRY_NEW]] ], [ [[NITER_NEXT_7:%.*]], [[LOOP]] ]
+; CHECK-NEXT:    call void @foo()
+; CHECK-NEXT:    call void @foo()
+; CHECK-NEXT:    call void @foo()
+; CHECK-NEXT:    call void @foo()
+; CHECK-NEXT:    call void @foo()
+; CHECK-NEXT:    call void @foo()
+; CHECK-NEXT:    call void @foo()
+; CHECK-NEXT:    call void @foo()
+; CHECK-NEXT:    [[IV_NEXT_7]] = add i128 [[IV]], 8
+; CHECK-NEXT:    [[NITER_NEXT_7]] = add i128 [[NITER]], 8
+; CHECK-NEXT:    [[NITER_NCMP_7:%.*]] = icmp ne i128 [[NITER_NEXT_7]], [[UNROLL_ITER]]
+; CHECK-NEXT:    br i1 [[NITER_NCMP_7]], label [[LOOP]], label [[EXIT_UNR_LCSSA_LOOPEXIT:%.*]]
+; CHECK:       exit.unr-lcssa.loopexit:
+; CHECK-NEXT:    [[IV_UNR_PH:%.*]] = phi i128 [ [[IV_NEXT_7]], [[LOOP]] ]
+; CHECK-NEXT:    br label [[EXIT_UNR_LCSSA]]
+; CHECK:       exit.unr-lcssa:
+; CHECK-NEXT:    [[IV_UNR:%.*]] = phi i128 [ 0, [[ENTRY:%.*]] ], [ [[IV_UNR_PH]], [[EXIT_UNR_LCSSA_LOOPEXIT]] ]
+; CHECK-NEXT:    [[LCMP_MOD:%.*]] = icmp ne i128 [[XTRAITER]], 0
+; CHECK-NEXT:    br i1 [[LCMP_MOD]], label [[LOOP_EPIL_PREHEADER:%.*]], label [[EXIT:%.*]]
+; CHECK:       loop.epil.preheader:
+; CHECK-NEXT:    br label [[LOOP_EPIL:%.*]]
+; CHECK:       loop.epil:
+; CHECK-NEXT:    [[IV_EPIL:%.*]] = phi i128 [ [[IV_UNR]], [[LOOP_EPIL_PREHEADER]] ], [ [[IV_NEXT_EPIL:%.*]], [[LOOP_EPIL]] ]
+; CHECK-NEXT:    [[EPIL_ITER:%.*]] = phi i128 [ 0, [[LOOP_EPIL_PREHEADER]] ], [ [[EPIL_ITER_NEXT:%.*]], [[LOOP_EPIL]] ]
+; CHECK-NEXT:    call void @foo()
+; CHECK-NEXT:    [[IV_NEXT_EPIL]] = add i128 [[IV_EPIL]], 1
+; CHECK-NEXT:    [[CMP_EPIL:%.*]] = icmp ne i128 [[IV_NEXT_EPIL]], [[N]]
+; CHECK-NEXT:    [[EPIL_ITER_NEXT]] = add i128 [[EPIL_ITER]], 1
+; CHECK-NEXT:    [[EPIL_ITER_CMP:%.*]] = icmp ne i128 [[EPIL_ITER_NEXT]], [[XTRAITER]]
+; CHECK-NEXT:    br i1 [[EPIL_ITER_CMP]], label [[LOOP_EPIL]], label [[EXIT_EPILOG_LCSSA:%.*]], !llvm.loop [[LOOP0:![0-9]+]]
+; CHECK:       exit.epilog-lcssa:
+; CHECK-NEXT:    br label [[EXIT]]
+; CHECK:       exit:
+; CHECK-NEXT:    ret void
+;
+entry:
+  br label %loop
+
+loop:
+  %iv = phi i128 [ 0, %entry ], [ %iv.next, %loop ]
+  call void @foo()
+  %iv.next = add i128 %iv, 1
+  %cmp = icmp ne i128 %iv.next, %n
+  br i1 %cmp, label %loop, label %exit
+
+exit:
+  ret void
+}
+;.
+; CHECK: [[LOOP0]] = distinct !{[[LOOP0]], [[META1:![0-9]+]]}
+; CHECK: [[META1]] = !{!"llvm.loop.unroll.disable"}
+;.