1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt -passes=loop-idiom -mtriple=x86_64 -mcpu=corei7 < %s -S | FileCheck %s 3 4declare void @escape_inner(i8, i8, i8, i1, i8) 5declare void @escape_outer(i8, i8, i8, i1, i8) 6 7; On corei7, lzcount is not cheap, so we don't transform. 8define i8 @n(i8 %val, i8 %start, i8 %extraoffset) { 9; CHECK-LABEL: @n( 10; CHECK-NEXT: entry: 11; CHECK-NEXT: br label [[LOOP:%.*]] 12; CHECK: loop: 13; CHECK-NEXT: [[IV:%.*]] = phi i8 [ [[START:%.*]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ] 14; CHECK-NEXT: [[NBITS:%.*]] = add nsw i8 [[IV]], [[EXTRAOFFSET:%.*]] 15; CHECK-NEXT: [[VAL_SHIFTED:%.*]] = lshr i8 [[VAL:%.*]], [[NBITS]] 16; CHECK-NEXT: [[VAL_SHIFTED_ISZERO:%.*]] = icmp eq i8 [[VAL_SHIFTED]], 0 17; CHECK-NEXT: [[IV_NEXT]] = add i8 [[IV]], 1 18; CHECK-NEXT: call void @escape_inner(i8 [[IV]], i8 [[NBITS]], i8 [[VAL_SHIFTED]], i1 [[VAL_SHIFTED_ISZERO]], i8 [[IV_NEXT]]) 19; CHECK-NEXT: br i1 [[VAL_SHIFTED_ISZERO]], label [[END:%.*]], label [[LOOP]] 20; CHECK: end: 21; CHECK-NEXT: [[IV_RES:%.*]] = phi i8 [ [[IV]], [[LOOP]] ] 22; CHECK-NEXT: [[NBITS_RES:%.*]] = phi i8 [ [[NBITS]], [[LOOP]] ] 23; CHECK-NEXT: [[VAL_SHIFTED_RES:%.*]] = phi i8 [ [[VAL_SHIFTED]], [[LOOP]] ] 24; CHECK-NEXT: [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[VAL_SHIFTED_ISZERO]], [[LOOP]] ] 25; CHECK-NEXT: [[IV_NEXT_RES:%.*]] = phi i8 [ [[IV_NEXT]], [[LOOP]] ] 26; CHECK-NEXT: call void @escape_outer(i8 [[IV_RES]], i8 [[NBITS_RES]], i8 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i8 [[IV_NEXT_RES]]) 27; CHECK-NEXT: ret i8 [[IV_RES]] 28; 29entry: 30 br label %loop 31 32loop: 33 %iv = phi i8 [ %start, %entry ], [ %iv.next, %loop ] 34 %nbits = add nsw i8 %iv, %extraoffset 35 %val.shifted = lshr i8 %val, %nbits 36 %val.shifted.iszero = icmp eq i8 %val.shifted, 0 37 %iv.next = add i8 %iv, 1 38 39 call void @escape_inner(i8 %iv, i8 %nbits, i8 %val.shifted, i1 %val.shifted.iszero, i8 %iv.next) 40 41 br i1 %val.shifted.iszero, label %end, label %loop 42 43end: 44 %iv.res = phi i8 [ %iv, %loop ] 45 %nbits.res = phi i8 [ %nbits, %loop ] 46 %val.shifted.res = phi i8 [ %val.shifted, %loop ] 47 %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ] 48 %iv.next.res = phi i8 [ %iv.next, %loop ] 49 50 call void @escape_outer(i8 %iv.res, i8 %nbits.res, i8 %val.shifted.res, i1 %val.shifted.iszero.res, i8 %iv.next.res) 51 52 ret i8 %iv.res 53} 54