diff --git a/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp b/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp index 32edfad5a5d97..b60c3b43a4f94 100644 --- a/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp +++ b/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp @@ -4129,15 +4129,14 @@ getAppleRuntimeUnrollPreferences(Loop *L, ScalarEvolution &SE, TargetTransformInfo::UnrollingPreferences &UP, AArch64TTIImpl &TTI) { // Limit loops with structure that is highly likely to benefit from runtime - // unrolling; that is we exclude outer loops, loops with multiple exits and - // many blocks (i.e. likely with complex control flow). Note that the - // heuristics here may be overly conservative and we err on the side of - // avoiding runtime unrolling rather than unroll excessively. They are all - // subject to further refinement. - if (!L->isInnermost() || !L->getExitBlock() || L->getNumBlocks() > 8) + // unrolling; that is we exclude outer loops and loops with many blocks (i.e. + // likely with complex control flow). Note that the heuristics here may be + // overly conservative and we err on the side of avoiding runtime unrolling + // rather than unroll excessively. They are all subject to further refinement. + if (!L->isInnermost() || L->getNumBlocks() > 8) return; - const SCEV *BTC = SE.getBackedgeTakenCount(L); + const SCEV *BTC = SE.getSymbolicMaxBackedgeTakenCount(L); if (isa(BTC) || isa(BTC) || (SE.getSmallConstantMaxTripCount(L) > 0 && SE.getSmallConstantMaxTripCount(L) <= 32)) @@ -4156,6 +4155,28 @@ getAppleRuntimeUnrollPreferences(Loop *L, ScalarEvolution &SE, } } + // Small search loops with multiple exits can be highly beneficial to unroll. + if (!L->getExitBlock()) { + if (L->getNumBlocks() == 2 && Size < 6 && + all_of( + L->getBlocks(), + [](BasicBlock *BB) { + return isa(BB->getTerminator()); + })) { + UP.RuntimeUnrollMultiExit = true; + UP.Runtime = true; + // Limit unroll count. + UP.DefaultUnrollRuntimeCount = 4; + // Allow slightly more costly trip-count expansion to catch search loops + // with pointer inductions. + UP.SCEVExpansionBudget = 5; + } + return; + } + + if (SE.getSymbolicMaxBackedgeTakenCount(L) != SE.getBackedgeTakenCount(L)) + return; + // Limit to loops with trip counts that are cheap to expand. UP.SCEVExpansionBudget = 1; diff --git a/llvm/test/Transforms/LoopUnroll/AArch64/apple-unrolling-multi-exit.ll b/llvm/test/Transforms/LoopUnroll/AArch64/apple-unrolling-multi-exit.ll index bfcd6f9e32a3b..31b23eae0f866 100644 --- a/llvm/test/Transforms/LoopUnroll/AArch64/apple-unrolling-multi-exit.ll +++ b/llvm/test/Transforms/LoopUnroll/AArch64/apple-unrolling-multi-exit.ll @@ -13,22 +13,78 @@ define i1 @multi_2_exit_find_i8_loop(ptr %vec, i8 %tgt) { ; APPLE-SAME: ptr [[VEC:%.*]], i8 [[TGT:%.*]]) #[[ATTR0:[0-9]+]] { ; APPLE-NEXT: [[ENTRY:.*]]: ; APPLE-NEXT: [[START:%.*]] = load ptr, ptr [[VEC]], align 8 +; APPLE-NEXT: [[START2:%.*]] = ptrtoint ptr [[START]] to i64 ; APPLE-NEXT: [[GEP_END:%.*]] = getelementptr inbounds nuw i8, ptr [[VEC]], i64 1 ; APPLE-NEXT: [[END:%.*]] = load ptr, ptr [[GEP_END]], align 8 -; APPLE-NEXT: br label %[[LOOP_HEADER:.*]] -; APPLE: [[LOOP_HEADER]]: -; APPLE-NEXT: [[PTR_IV:%.*]] = phi ptr [ [[PTR_IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ], [ [[START]], %[[ENTRY]] ] +; APPLE-NEXT: [[END1:%.*]] = ptrtoint ptr [[END]] to i64 +; APPLE-NEXT: [[TMP0:%.*]] = sub i64 [[END1]], [[START2]] +; APPLE-NEXT: [[TMP1:%.*]] = freeze i64 [[TMP0]] +; APPLE-NEXT: [[TMP2:%.*]] = add i64 [[TMP1]], -1 +; APPLE-NEXT: [[XTRAITER:%.*]] = and i64 [[TMP1]], 3 +; APPLE-NEXT: [[LCMP_MOD:%.*]] = icmp ne i64 [[XTRAITER]], 0 +; APPLE-NEXT: br i1 [[LCMP_MOD]], label %[[LOOP_HEADER_PROL_PREHEADER:.*]], label %[[LOOP_HEADER_PROL_LOOPEXIT:.*]] +; APPLE: [[LOOP_HEADER_PROL_PREHEADER]]: +; APPLE-NEXT: br label %[[LOOP_HEADER_PROL:.*]] +; APPLE: [[LOOP_HEADER_PROL]]: +; APPLE-NEXT: [[PTR_IV:%.*]] = phi ptr [ [[PTR_IV_NEXT:%.*]], %[[LOOP_LATCH_PROL:.*]] ], [ [[START]], %[[LOOP_HEADER_PROL_PREHEADER]] ] +; APPLE-NEXT: [[PROL_ITER:%.*]] = phi i64 [ 0, %[[LOOP_HEADER_PROL_PREHEADER]] ], [ [[PROL_ITER_NEXT:%.*]], %[[LOOP_LATCH_PROL]] ] ; APPLE-NEXT: [[L:%.*]] = load i8, ptr [[PTR_IV]], align 8 ; APPLE-NEXT: [[C_1:%.*]] = icmp eq i8 [[L]], [[TGT]] -; APPLE-NEXT: br i1 [[C_1]], label %[[EXIT:.*]], label %[[LOOP_LATCH]] -; APPLE: [[LOOP_LATCH]]: +; APPLE-NEXT: br i1 [[C_1]], label %[[EXIT_UNR_LCSSA_LOOPEXIT3:.*]], label %[[LOOP_LATCH_PROL]] +; APPLE: [[LOOP_LATCH_PROL]]: ; APPLE-NEXT: [[PTR_IV_NEXT]] = getelementptr inbounds nuw i8, ptr [[PTR_IV]], i64 1 ; APPLE-NEXT: [[C_2:%.*]] = icmp eq ptr [[PTR_IV_NEXT]], [[END]] -; APPLE-NEXT: br i1 [[C_2]], label %[[EXIT]], label %[[LOOP_HEADER]] -; APPLE: [[EXIT]]: -; APPLE-NEXT: [[RES:%.*]] = phi ptr [ [[PTR_IV]], %[[LOOP_HEADER]] ], [ [[END]], %[[LOOP_LATCH]] ] +; APPLE-NEXT: [[PROL_ITER_NEXT]] = add i64 [[PROL_ITER]], 1 +; APPLE-NEXT: [[PROL_ITER_CMP:%.*]] = icmp ne i64 [[PROL_ITER_NEXT]], [[XTRAITER]] +; APPLE-NEXT: br i1 [[PROL_ITER_CMP]], label %[[LOOP_HEADER_PROL]], label %[[LOOP_HEADER_PROL_LOOPEXIT_UNR_LCSSA:.*]], !llvm.loop [[LOOP0:![0-9]+]] +; APPLE: [[LOOP_HEADER_PROL_LOOPEXIT_UNR_LCSSA]]: +; APPLE-NEXT: [[RES_UNR_PH:%.*]] = phi ptr [ [[END]], %[[LOOP_LATCH_PROL]] ] +; APPLE-NEXT: [[PTR_IV_UNR_PH:%.*]] = phi ptr [ [[PTR_IV_NEXT]], %[[LOOP_LATCH_PROL]] ] +; APPLE-NEXT: br label %[[LOOP_HEADER_PROL_LOOPEXIT]] +; APPLE: [[LOOP_HEADER_PROL_LOOPEXIT]]: +; APPLE-NEXT: [[RES_UNR:%.*]] = phi ptr [ poison, %[[ENTRY]] ], [ [[RES_UNR_PH]], %[[LOOP_HEADER_PROL_LOOPEXIT_UNR_LCSSA]] ] +; APPLE-NEXT: [[PTR_IV_UNR:%.*]] = phi ptr [ [[START]], %[[ENTRY]] ], [ [[PTR_IV_UNR_PH]], %[[LOOP_HEADER_PROL_LOOPEXIT_UNR_LCSSA]] ] +; APPLE-NEXT: [[TMP3:%.*]] = icmp ult i64 [[TMP2]], 3 +; APPLE-NEXT: br i1 [[TMP3]], label %[[EXIT:.*]], label %[[ENTRY_NEW:.*]] +; APPLE: [[ENTRY_NEW]]: +; APPLE-NEXT: br label %[[LOOP_HEADER:.*]] +; APPLE: [[LOOP_HEADER]]: +; APPLE-NEXT: [[PTR_IV1:%.*]] = phi ptr [ [[PTR_IV_UNR]], %[[ENTRY_NEW]] ], [ [[RES:%.*]], %[[LOOP_LATCH_3:.*]] ] +; APPLE-NEXT: [[L1:%.*]] = load i8, ptr [[PTR_IV1]], align 8 +; APPLE-NEXT: [[C_4:%.*]] = icmp eq i8 [[L1]], [[TGT]] +; APPLE-NEXT: br i1 [[C_4]], label %[[EXIT_UNR_LCSSA_LOOPEXIT:.*]], label %[[LOOP_LATCH:.*]] +; APPLE: [[LOOP_LATCH]]: +; APPLE-NEXT: [[PTR_IV_NEXT1:%.*]] = getelementptr inbounds nuw i8, ptr [[PTR_IV1]], i64 1 +; APPLE-NEXT: [[L_1:%.*]] = load i8, ptr [[PTR_IV_NEXT1]], align 8 +; APPLE-NEXT: [[C_1_1:%.*]] = icmp eq i8 [[L_1]], [[TGT]] +; APPLE-NEXT: br i1 [[C_1_1]], label %[[EXIT_UNR_LCSSA_LOOPEXIT]], label %[[LOOP_LATCH_1:.*]] +; APPLE: [[LOOP_LATCH_1]]: +; APPLE-NEXT: [[PTR_IV_NEXT_1:%.*]] = getelementptr inbounds nuw i8, ptr [[PTR_IV_NEXT1]], i64 1 +; APPLE-NEXT: [[L_2:%.*]] = load i8, ptr [[PTR_IV_NEXT_1]], align 8 +; APPLE-NEXT: [[C_1_2:%.*]] = icmp eq i8 [[L_2]], [[TGT]] +; APPLE-NEXT: br i1 [[C_1_2]], label %[[EXIT_UNR_LCSSA_LOOPEXIT]], label %[[LOOP_LATCH_2:.*]] +; APPLE: [[LOOP_LATCH_2]]: +; APPLE-NEXT: [[PTR_IV_NEXT_2:%.*]] = getelementptr inbounds nuw i8, ptr [[PTR_IV_NEXT_1]], i64 1 +; APPLE-NEXT: [[L_3:%.*]] = load i8, ptr [[PTR_IV_NEXT_2]], align 8 +; APPLE-NEXT: [[C_1_3:%.*]] = icmp eq i8 [[L_3]], [[TGT]] +; APPLE-NEXT: br i1 [[C_1_3]], label %[[EXIT_UNR_LCSSA_LOOPEXIT]], label %[[LOOP_LATCH_3]] +; APPLE: [[LOOP_LATCH_3]]: +; APPLE-NEXT: [[RES]] = getelementptr inbounds nuw i8, ptr [[PTR_IV_NEXT_2]], i64 1 ; APPLE-NEXT: [[C_3:%.*]] = icmp eq ptr [[RES]], [[END]] -; APPLE-NEXT: ret i1 [[C_3]] +; APPLE-NEXT: br i1 [[C_3]], label %[[EXIT_UNR_LCSSA_LOOPEXIT]], label %[[LOOP_HEADER]] +; APPLE: [[EXIT_UNR_LCSSA_LOOPEXIT]]: +; APPLE-NEXT: [[RES_PH_PH:%.*]] = phi ptr [ [[PTR_IV1]], %[[LOOP_HEADER]] ], [ [[PTR_IV_NEXT1]], %[[LOOP_LATCH]] ], [ [[PTR_IV_NEXT_1]], %[[LOOP_LATCH_1]] ], [ [[PTR_IV_NEXT_2]], %[[LOOP_LATCH_2]] ], [ [[END]], %[[LOOP_LATCH_3]] ] +; APPLE-NEXT: br label %[[EXIT_UNR_LCSSA:.*]] +; APPLE: [[EXIT_UNR_LCSSA_LOOPEXIT3]]: +; APPLE-NEXT: [[RES_PH_PH4:%.*]] = phi ptr [ [[PTR_IV]], %[[LOOP_HEADER_PROL]] ] +; APPLE-NEXT: br label %[[EXIT_UNR_LCSSA]] +; APPLE: [[EXIT_UNR_LCSSA]]: +; APPLE-NEXT: [[RES_PH:%.*]] = phi ptr [ [[RES_PH_PH]], %[[EXIT_UNR_LCSSA_LOOPEXIT]] ], [ [[RES_PH_PH4]], %[[EXIT_UNR_LCSSA_LOOPEXIT3]] ] +; APPLE-NEXT: br label %[[EXIT]] +; APPLE: [[EXIT]]: +; APPLE-NEXT: [[RES1:%.*]] = phi ptr [ [[RES_UNR]], %[[LOOP_HEADER_PROL_LOOPEXIT]] ], [ [[RES_PH]], %[[EXIT_UNR_LCSSA]] ] +; APPLE-NEXT: [[C_5:%.*]] = icmp eq ptr [[RES1]], [[END]] +; APPLE-NEXT: ret i1 [[C_5]] ; ; OTHER-LABEL: define i1 @multi_2_exit_find_i8_loop( ; OTHER-SAME: ptr [[VEC:%.*]], i8 [[TGT:%.*]]) #[[ATTR0:[0-9]+]] { @@ -80,22 +136,81 @@ define i1 @multi_2_exit_find_ptr_loop(ptr %vec, ptr %tgt) { ; APPLE-SAME: ptr [[VEC:%.*]], ptr [[TGT:%.*]]) #[[ATTR0]] { ; APPLE-NEXT: [[ENTRY:.*]]: ; APPLE-NEXT: [[START:%.*]] = load ptr, ptr [[VEC]], align 8 +; APPLE-NEXT: [[START2:%.*]] = ptrtoint ptr [[START]] to i64 ; APPLE-NEXT: call void @llvm.assume(i1 true) [ "align"(ptr [[START]], i64 8) ] ; APPLE-NEXT: [[GEP_END:%.*]] = getelementptr inbounds nuw i8, ptr [[VEC]], i64 8 ; APPLE-NEXT: [[END:%.*]] = load ptr, ptr [[GEP_END]], align 8 +; APPLE-NEXT: [[END1:%.*]] = ptrtoint ptr [[END]] to i64 ; APPLE-NEXT: call void @llvm.assume(i1 true) [ "align"(ptr [[END]], i64 8) ] -; APPLE-NEXT: br label %[[LOOP_HEADER:.*]] -; APPLE: [[LOOP_HEADER]]: -; APPLE-NEXT: [[PTR_IV:%.*]] = phi ptr [ [[PTR_IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ], [ [[START]], %[[ENTRY]] ] +; APPLE-NEXT: [[TMP0:%.*]] = add i64 [[END1]], -8 +; APPLE-NEXT: [[TMP1:%.*]] = sub i64 [[TMP0]], [[START2]] +; APPLE-NEXT: [[TMP2:%.*]] = lshr i64 [[TMP1]], 3 +; APPLE-NEXT: [[TMP3:%.*]] = add nuw nsw i64 [[TMP2]], 1 +; APPLE-NEXT: [[TMP4:%.*]] = freeze i64 [[TMP3]] +; APPLE-NEXT: [[TMP5:%.*]] = add i64 [[TMP4]], -1 +; APPLE-NEXT: [[XTRAITER:%.*]] = and i64 [[TMP4]], 3 +; APPLE-NEXT: [[LCMP_MOD:%.*]] = icmp ne i64 [[XTRAITER]], 0 +; APPLE-NEXT: br i1 [[LCMP_MOD]], label %[[LOOP_HEADER_PROL_PREHEADER:.*]], label %[[LOOP_HEADER_PROL_LOOPEXIT:.*]] +; APPLE: [[LOOP_HEADER_PROL_PREHEADER]]: +; APPLE-NEXT: br label %[[LOOP_HEADER_PROL:.*]] +; APPLE: [[LOOP_HEADER_PROL]]: +; APPLE-NEXT: [[PTR_IV:%.*]] = phi ptr [ [[PTR_IV_NEXT:%.*]], %[[LOOP_LATCH_PROL:.*]] ], [ [[START]], %[[LOOP_HEADER_PROL_PREHEADER]] ] +; APPLE-NEXT: [[PROL_ITER:%.*]] = phi i64 [ 0, %[[LOOP_HEADER_PROL_PREHEADER]] ], [ [[PROL_ITER_NEXT:%.*]], %[[LOOP_LATCH_PROL]] ] ; APPLE-NEXT: [[L:%.*]] = load ptr, ptr [[PTR_IV]], align 8 ; APPLE-NEXT: [[C_1:%.*]] = icmp eq ptr [[L]], [[TGT]] -; APPLE-NEXT: br i1 [[C_1]], label %[[EXIT:.*]], label %[[LOOP_LATCH]] -; APPLE: [[LOOP_LATCH]]: +; APPLE-NEXT: br i1 [[C_1]], label %[[EXIT_UNR_LCSSA_LOOPEXIT3:.*]], label %[[LOOP_LATCH_PROL]] +; APPLE: [[LOOP_LATCH_PROL]]: ; APPLE-NEXT: [[PTR_IV_NEXT]] = getelementptr inbounds nuw i8, ptr [[PTR_IV]], i64 8 ; APPLE-NEXT: [[C_2:%.*]] = icmp eq ptr [[PTR_IV_NEXT]], [[END]] -; APPLE-NEXT: br i1 [[C_2]], label %[[EXIT]], label %[[LOOP_HEADER]] +; APPLE-NEXT: [[PROL_ITER_NEXT]] = add i64 [[PROL_ITER]], 1 +; APPLE-NEXT: [[PROL_ITER_CMP:%.*]] = icmp ne i64 [[PROL_ITER_NEXT]], [[XTRAITER]] +; APPLE-NEXT: br i1 [[PROL_ITER_CMP]], label %[[LOOP_HEADER_PROL]], label %[[LOOP_HEADER_PROL_LOOPEXIT_UNR_LCSSA:.*]], !llvm.loop [[LOOP2:![0-9]+]] +; APPLE: [[LOOP_HEADER_PROL_LOOPEXIT_UNR_LCSSA]]: +; APPLE-NEXT: [[RES_UNR_PH:%.*]] = phi ptr [ [[END]], %[[LOOP_LATCH_PROL]] ] +; APPLE-NEXT: [[PTR_IV_UNR_PH:%.*]] = phi ptr [ [[PTR_IV_NEXT]], %[[LOOP_LATCH_PROL]] ] +; APPLE-NEXT: br label %[[LOOP_HEADER_PROL_LOOPEXIT]] +; APPLE: [[LOOP_HEADER_PROL_LOOPEXIT]]: +; APPLE-NEXT: [[RES_UNR:%.*]] = phi ptr [ poison, %[[ENTRY]] ], [ [[RES_UNR_PH]], %[[LOOP_HEADER_PROL_LOOPEXIT_UNR_LCSSA]] ] +; APPLE-NEXT: [[PTR_IV_UNR:%.*]] = phi ptr [ [[START]], %[[ENTRY]] ], [ [[PTR_IV_UNR_PH]], %[[LOOP_HEADER_PROL_LOOPEXIT_UNR_LCSSA]] ] +; APPLE-NEXT: [[TMP6:%.*]] = icmp ult i64 [[TMP5]], 3 +; APPLE-NEXT: br i1 [[TMP6]], label %[[EXIT:.*]], label %[[ENTRY_NEW:.*]] +; APPLE: [[ENTRY_NEW]]: +; APPLE-NEXT: br label %[[LOOP_HEADER:.*]] +; APPLE: [[LOOP_HEADER]]: +; APPLE-NEXT: [[PTR_IV1:%.*]] = phi ptr [ [[PTR_IV_UNR]], %[[ENTRY_NEW]] ], [ [[PTR_IV_NEXT_3:%.*]], %[[LOOP_LATCH_3:.*]] ] +; APPLE-NEXT: [[L1:%.*]] = load ptr, ptr [[PTR_IV1]], align 8 +; APPLE-NEXT: [[C_4:%.*]] = icmp eq ptr [[L1]], [[TGT]] +; APPLE-NEXT: br i1 [[C_4]], label %[[EXIT_UNR_LCSSA_LOOPEXIT:.*]], label %[[LOOP_LATCH:.*]] +; APPLE: [[LOOP_LATCH]]: +; APPLE-NEXT: [[PTR_IV_NEXT1:%.*]] = getelementptr inbounds nuw i8, ptr [[PTR_IV1]], i64 8 +; APPLE-NEXT: [[L_1:%.*]] = load ptr, ptr [[PTR_IV_NEXT1]], align 8 +; APPLE-NEXT: [[C_1_1:%.*]] = icmp eq ptr [[L_1]], [[TGT]] +; APPLE-NEXT: br i1 [[C_1_1]], label %[[EXIT_UNR_LCSSA_LOOPEXIT]], label %[[LOOP_LATCH_1:.*]] +; APPLE: [[LOOP_LATCH_1]]: +; APPLE-NEXT: [[PTR_IV_NEXT_1:%.*]] = getelementptr inbounds nuw i8, ptr [[PTR_IV_NEXT1]], i64 8 +; APPLE-NEXT: [[L_2:%.*]] = load ptr, ptr [[PTR_IV_NEXT_1]], align 8 +; APPLE-NEXT: [[C_1_2:%.*]] = icmp eq ptr [[L_2]], [[TGT]] +; APPLE-NEXT: br i1 [[C_1_2]], label %[[EXIT_UNR_LCSSA_LOOPEXIT]], label %[[LOOP_LATCH_2:.*]] +; APPLE: [[LOOP_LATCH_2]]: +; APPLE-NEXT: [[PTR_IV_NEXT_2:%.*]] = getelementptr inbounds nuw i8, ptr [[PTR_IV_NEXT_1]], i64 8 +; APPLE-NEXT: [[L_3:%.*]] = load ptr, ptr [[PTR_IV_NEXT_2]], align 8 +; APPLE-NEXT: [[C_1_3:%.*]] = icmp eq ptr [[L_3]], [[TGT]] +; APPLE-NEXT: br i1 [[C_1_3]], label %[[EXIT_UNR_LCSSA_LOOPEXIT]], label %[[LOOP_LATCH_3]] +; APPLE: [[LOOP_LATCH_3]]: +; APPLE-NEXT: [[PTR_IV_NEXT_3]] = getelementptr inbounds nuw i8, ptr [[PTR_IV_NEXT_2]], i64 8 +; APPLE-NEXT: [[C_2_3:%.*]] = icmp eq ptr [[PTR_IV_NEXT_3]], [[END]] +; APPLE-NEXT: br i1 [[C_2_3]], label %[[EXIT_UNR_LCSSA_LOOPEXIT]], label %[[LOOP_HEADER]] +; APPLE: [[EXIT_UNR_LCSSA_LOOPEXIT]]: +; APPLE-NEXT: [[RES_PH_PH:%.*]] = phi ptr [ [[PTR_IV1]], %[[LOOP_HEADER]] ], [ [[PTR_IV_NEXT1]], %[[LOOP_LATCH]] ], [ [[PTR_IV_NEXT_1]], %[[LOOP_LATCH_1]] ], [ [[PTR_IV_NEXT_2]], %[[LOOP_LATCH_2]] ], [ [[END]], %[[LOOP_LATCH_3]] ] +; APPLE-NEXT: br label %[[EXIT_UNR_LCSSA:.*]] +; APPLE: [[EXIT_UNR_LCSSA_LOOPEXIT3]]: +; APPLE-NEXT: [[RES_PH_PH4:%.*]] = phi ptr [ [[PTR_IV]], %[[LOOP_HEADER_PROL]] ] +; APPLE-NEXT: br label %[[EXIT_UNR_LCSSA]] +; APPLE: [[EXIT_UNR_LCSSA]]: +; APPLE-NEXT: [[RES_PH:%.*]] = phi ptr [ [[RES_PH_PH]], %[[EXIT_UNR_LCSSA_LOOPEXIT]] ], [ [[RES_PH_PH4]], %[[EXIT_UNR_LCSSA_LOOPEXIT3]] ] +; APPLE-NEXT: br label %[[EXIT]] ; APPLE: [[EXIT]]: -; APPLE-NEXT: [[RES:%.*]] = phi ptr [ [[PTR_IV]], %[[LOOP_HEADER]] ], [ [[END]], %[[LOOP_LATCH]] ] +; APPLE-NEXT: [[RES:%.*]] = phi ptr [ [[RES_UNR]], %[[LOOP_HEADER_PROL_LOOPEXIT]] ], [ [[RES_PH]], %[[EXIT_UNR_LCSSA]] ] ; APPLE-NEXT: call void @llvm.assume(i1 true) [ "align"(ptr [[END]], i64 8) ] ; APPLE-NEXT: [[C_3:%.*]] = icmp eq ptr [[RES]], [[END]] ; APPLE-NEXT: ret i1 [[C_3]] @@ -393,3 +508,8 @@ exit.2: } declare void @llvm.assume(i1 noundef) +;. +; APPLE: [[LOOP0]] = distinct !{[[LOOP0]], [[META1:![0-9]+]]} +; APPLE: [[META1]] = !{!"llvm.loop.unroll.disable"} +; APPLE: [[LOOP2]] = distinct !{[[LOOP2]], [[META1]]} +;.