xref: /llvm-project/llvm/test/Transforms/LoopIdiom/X86/logical-right-shift-until-zero-debuginfo.ll (revision 094572701dce4aaf36f4521d6cf750420d39f206) 
1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt -passes=debugify,loop-idiom -mtriple=x86_64 -mcpu=corei7 < %s -S | FileCheck %s --check-prefixes=NOLZCNT
3; RUN: opt -passes=debugify,loop-idiom -mtriple=x86_64 -mcpu=core-avx2 < %s -S | FileCheck %s --check-prefixes=LZCNT
4; RUN: opt -passes=debugify,loop-idiom -mtriple=x86_64 -mcpu=corei7 < %s -S --try-experimental-debuginfo-iterators | FileCheck %s --check-prefixes=NOLZCNT
5
6declare void @escape_inner(i8, i8, i8, i1, i8)
7declare void @escape_outer(i8, i8, i8, i1, i8)
8
9define i8 @p(i8 %val, i8 %start, i8 %extraoffset) {
10; NOLZCNT-LABEL: @p(
11; NOLZCNT-NEXT:  entry:
12; NOLZCNT-NEXT:    br label [[LOOP:%.*]], !dbg [[DBG20:![0-9]+]]
13; NOLZCNT:       loop:
14; NOLZCNT-NEXT:    [[IV:%.*]] = phi i8 [ [[START:%.*]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG21:![0-9]+]]
15; NOLZCNT-NEXT:      #dbg_value(i8 [[IV]], [[META9:![0-9]+]], !DIExpression(), [[DBG21]])
16; NOLZCNT-NEXT:    [[NBITS:%.*]] = add nsw i8 [[IV]], [[EXTRAOFFSET:%.*]], !dbg [[DBG22:![0-9]+]]
17; NOLZCNT-NEXT:      #dbg_value(i8 [[NBITS]], [[META11:![0-9]+]], !DIExpression(), [[DBG22]])
18; NOLZCNT-NEXT:    [[VAL_SHIFTED:%.*]] = lshr i8 [[VAL:%.*]], [[NBITS]], !dbg [[DBG23:![0-9]+]]
19; NOLZCNT-NEXT:      #dbg_value(i8 [[VAL_SHIFTED]], [[META12:![0-9]+]], !DIExpression(), [[DBG23]])
20; NOLZCNT-NEXT:    [[VAL_SHIFTED_ISZERO:%.*]] = icmp eq i8 [[VAL_SHIFTED]], 0, !dbg [[DBG24:![0-9]+]]
21; NOLZCNT-NEXT:      #dbg_value(i1 [[VAL_SHIFTED_ISZERO]], [[META13:![0-9]+]], !DIExpression(), [[DBG24]])
22; NOLZCNT-NEXT:    [[IV_NEXT]] = add i8 [[IV]], 1, !dbg [[DBG25:![0-9]+]]
23; NOLZCNT-NEXT:      #dbg_value(i8 [[IV_NEXT]], [[META14:![0-9]+]], !DIExpression(), [[DBG25]])
24; NOLZCNT-NEXT:    call void @escape_inner(i8 [[IV]], i8 [[NBITS]], i8 [[VAL_SHIFTED]], i1 [[VAL_SHIFTED_ISZERO]], i8 [[IV_NEXT]]), !dbg [[DBG26:![0-9]+]]
25; NOLZCNT-NEXT:    br i1 [[VAL_SHIFTED_ISZERO]], label [[END:%.*]], label [[LOOP]], !dbg [[DBG27:![0-9]+]]
26; NOLZCNT:       end:
27; NOLZCNT-NEXT:    [[IV_RES:%.*]] = phi i8 [ [[IV]], [[LOOP]] ], !dbg [[DBG28:![0-9]+]]
28; NOLZCNT-NEXT:    [[NBITS_RES:%.*]] = phi i8 [ [[NBITS]], [[LOOP]] ], !dbg [[DBG29:![0-9]+]]
29; NOLZCNT-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i8 [ [[VAL_SHIFTED]], [[LOOP]] ], !dbg [[DBG30:![0-9]+]]
30; NOLZCNT-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[VAL_SHIFTED_ISZERO]], [[LOOP]] ], !dbg [[DBG31:![0-9]+]]
31; NOLZCNT-NEXT:    [[IV_NEXT_RES:%.*]] = phi i8 [ [[IV_NEXT]], [[LOOP]] ], !dbg [[DBG32:![0-9]+]]
32; NOLZCNT-NEXT:      #dbg_value(i8 [[IV_RES]], [[META15:![0-9]+]], !DIExpression(), [[DBG28]])
33; NOLZCNT-NEXT:      #dbg_value(i8 [[NBITS_RES]], [[META16:![0-9]+]], !DIExpression(), [[DBG29]])
34; NOLZCNT-NEXT:      #dbg_value(i8 [[VAL_SHIFTED_RES]], [[META17:![0-9]+]], !DIExpression(), [[DBG30]])
35; NOLZCNT-NEXT:      #dbg_value(i1 [[VAL_SHIFTED_ISZERO_RES]], [[META18:![0-9]+]], !DIExpression(), [[DBG31]])
36; NOLZCNT-NEXT:      #dbg_value(i8 [[IV_NEXT_RES]], [[META19:![0-9]+]], !DIExpression(), [[DBG32]])
37; NOLZCNT-NEXT:    call void @escape_outer(i8 [[IV_RES]], i8 [[NBITS_RES]], i8 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i8 [[IV_NEXT_RES]]), !dbg [[DBG33:![0-9]+]]
38; NOLZCNT-NEXT:    ret i8 [[IV_RES]], !dbg [[DBG34:![0-9]+]]
39;
40; LZCNT-LABEL: @p(
41; LZCNT-NEXT:  entry:
42; LZCNT-NEXT:    [[VAL_NUMLEADINGZEROS:%.*]] = call i8 @llvm.ctlz.i8(i8 [[VAL:%.*]], i1 false), !dbg [[DBG20:![0-9]+]]
43; LZCNT-NEXT:    [[VAL_NUMACTIVEBITS:%.*]] = sub nuw nsw i8 8, [[VAL_NUMLEADINGZEROS]], !dbg [[DBG20]]
44; LZCNT-NEXT:    [[TMP0:%.*]] = sub i8 0, [[EXTRAOFFSET:%.*]], !dbg [[DBG21:![0-9]+]]
45; LZCNT-NEXT:    [[VAL_NUMACTIVEBITS_OFFSET:%.*]] = add nsw i8 [[VAL_NUMACTIVEBITS]], [[TMP0]], !dbg [[DBG20]]
46; LZCNT-NEXT:    [[IV_FINAL:%.*]] = call i8 @llvm.smax.i8(i8 [[VAL_NUMACTIVEBITS_OFFSET]], i8 [[START:%.*]]), !dbg [[DBG20]]
47; LZCNT-NEXT:    [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nsw i8 [[IV_FINAL]], [[START]], !dbg [[DBG20]]
48; LZCNT-NEXT:    [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i8 [[LOOP_BACKEDGETAKENCOUNT]], 1, !dbg [[DBG20]]
49; LZCNT-NEXT:    br label [[LOOP:%.*]], !dbg [[DBG21]]
50; LZCNT:       loop:
51; LZCNT-NEXT:    [[LOOP_IV:%.*]] = phi i8 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG20]]
52; LZCNT-NEXT:    [[LOOP_IV_NEXT]] = add nuw nsw i8 [[LOOP_IV]], 1, !dbg [[DBG22:![0-9]+]]
53; LZCNT-NEXT:    [[LOOP_IVCHECK:%.*]] = icmp eq i8 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]], !dbg [[DBG22]]
54; LZCNT-NEXT:    [[IV:%.*]] = add nsw i8 [[LOOP_IV]], [[START]], !dbg [[DBG22]]
55; LZCNT-NEXT:      #dbg_value(i8 [[IV]], [[META9:![0-9]+]], !DIExpression(), [[DBG20]])
56; LZCNT-NEXT:    [[NBITS:%.*]] = add nsw i8 [[IV]], [[EXTRAOFFSET]], !dbg [[DBG22]]
57; LZCNT-NEXT:      #dbg_value(i8 [[NBITS]], [[META11:![0-9]+]], !DIExpression(), [[DBG22]])
58; LZCNT-NEXT:    [[VAL_SHIFTED:%.*]] = lshr i8 [[VAL]], [[NBITS]], !dbg [[DBG23:![0-9]+]]
59; LZCNT-NEXT:      #dbg_value(i8 [[VAL_SHIFTED]], [[META12:![0-9]+]], !DIExpression(), [[DBG23]])
60; LZCNT-NEXT:      #dbg_value(i1 [[LOOP_IVCHECK]], [[META13:![0-9]+]], !DIExpression(), [[META24:![0-9]+]])
61; LZCNT-NEXT:    [[IV_NEXT:%.*]] = add i8 [[IV]], 1, !dbg [[DBG25:![0-9]+]]
62; LZCNT-NEXT:      #dbg_value(i8 [[IV_NEXT]], [[META14:![0-9]+]], !DIExpression(), [[DBG25]])
63; LZCNT-NEXT:    call void @escape_inner(i8 [[IV]], i8 [[NBITS]], i8 [[VAL_SHIFTED]], i1 [[LOOP_IVCHECK]], i8 [[IV_NEXT]]), !dbg [[DBG26:![0-9]+]]
64; LZCNT-NEXT:    br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]], !dbg [[DBG27:![0-9]+]]
65; LZCNT:       end:
66; LZCNT-NEXT:    [[IV_RES:%.*]] = phi i8 [ [[IV_FINAL]], [[LOOP]] ], !dbg [[DBG28:![0-9]+]]
67; LZCNT-NEXT:    [[NBITS_RES:%.*]] = phi i8 [ [[NBITS]], [[LOOP]] ], !dbg [[DBG29:![0-9]+]]
68; LZCNT-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i8 [ [[VAL_SHIFTED]], [[LOOP]] ], !dbg [[DBG30:![0-9]+]]
69; LZCNT-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[LOOP_IVCHECK]], [[LOOP]] ], !dbg [[DBG31:![0-9]+]]
70; LZCNT-NEXT:    [[IV_NEXT_RES:%.*]] = phi i8 [ [[IV_NEXT]], [[LOOP]] ], !dbg [[DBG32:![0-9]+]]
71; LZCNT-NEXT:      #dbg_value(i8 [[IV_RES]], [[META15:![0-9]+]], !DIExpression(), [[DBG28]])
72; LZCNT-NEXT:      #dbg_value(i8 [[NBITS_RES]], [[META16:![0-9]+]], !DIExpression(), [[DBG29]])
73; LZCNT-NEXT:      #dbg_value(i8 [[VAL_SHIFTED_RES]], [[META17:![0-9]+]], !DIExpression(), [[DBG30]])
74; LZCNT-NEXT:      #dbg_value(i1 [[VAL_SHIFTED_ISZERO_RES]], [[META18:![0-9]+]], !DIExpression(), [[DBG31]])
75; LZCNT-NEXT:      #dbg_value(i8 [[IV_NEXT_RES]], [[META19:![0-9]+]], !DIExpression(), [[DBG32]])
76; LZCNT-NEXT:    call void @escape_outer(i8 [[IV_RES]], i8 [[NBITS_RES]], i8 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i8 [[IV_NEXT_RES]]), !dbg [[DBG33:![0-9]+]]
77; LZCNT-NEXT:    ret i8 [[IV_RES]], !dbg [[DBG34:![0-9]+]]
78;
79entry:
80  br label %loop
81
82loop:
83  %iv = phi i8 [ %start, %entry ], [ %iv.next, %loop ]
84  %nbits = add nsw i8 %iv, %extraoffset
85  %val.shifted = lshr i8 %val, %nbits
86  %val.shifted.iszero = icmp eq i8 %val.shifted, 0
87  %iv.next = add i8 %iv, 1
88
89  call void @escape_inner(i8 %iv, i8 %nbits, i8 %val.shifted, i1 %val.shifted.iszero, i8 %iv.next)
90
91  br i1 %val.shifted.iszero, label %end, label %loop
92
93end:
94  %iv.res = phi i8 [ %iv, %loop ]
95  %nbits.res = phi i8 [ %nbits, %loop ]
96  %val.shifted.res = phi i8 [ %val.shifted, %loop ]
97  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
98  %iv.next.res = phi i8 [ %iv.next, %loop ]
99
100  call void @escape_outer(i8 %iv.res, i8 %nbits.res, i8 %val.shifted.res, i1 %val.shifted.iszero.res, i8 %iv.next.res)
101
102  ret i8 %iv.res
103}
104