xref: /llvm-project/llvm/test/DebugInfo/MIR/InstrRef/phi-coalesce-subreg.mir (revision d53425e2a33a0ff7336c86d3f668b1855c47a6de) 
1# RUN: llc %s -o - -mtriple=x86_64-unknown-unknown \
2# RUN:    -experimental-debug-variable-locations \
3# RUN:    -start-before=phi-node-elimination \
4# RUN:    -stop-after=register-coalescer \
5# RUN:    | FileCheck %s --check-prefix=DOESCOALESCE
6# RUN: llc %s -o - -mtriple=x86_64-unknown-unknown \
7# RUN:    -experimental-debug-variable-locations \
8# RUN:    -start-before=phi-node-elimination \
9# RUN:    -stop-after=virtregrewriter \
10# RUN:    | FileCheck %s --check-prefix=CHECK
11#
12# This is a sibling-test for phi-coalescing.mir, using similar code but where
13# registers are coalesced across subregisters. Specifically, vreg %2 below is
14# a 16-bit register, but will be coalesced into the lower 16 bits of a 32 bit
15# vreg during coalescing. We should survive this transformation, and emit a
16# DBG_PHI for $bx where the PHI was.
17--- |
18  ; ModuleID = 'promoted.ll'
19  source_filename = "test.c"
20  target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
21  target triple = "x86_64-unknown-linux-gnu"
22
23  ; Function Attrs: noinline nounwind uwtable
24  define dso_local i32 @foo(i16 signext %bar, i16 signext %baz) !dbg !7 {
25  entry:
26    call void @llvm.dbg.value(metadata i16 %bar, metadata !12, metadata !DIExpression()), !dbg !13
27    call void @llvm.dbg.value(metadata i16 %baz, metadata !14, metadata !DIExpression()), !dbg !13
28    call void @ext(i16 signext %bar), !dbg !13
29    %conv = sext i16 %bar to i32, !dbg !13
30    %add = add nsw i32 %conv, 12, !dbg !13
31    %conv1 = trunc i32 %add to i16, !dbg !13
32    call void @llvm.dbg.value(metadata i16 %conv1, metadata !12, metadata !DIExpression()), !dbg !13
33    call void @ext(i16 signext %conv1), !dbg !13
34    %call = call signext i16 @getlong(), !dbg !13
35    %tobool = icmp ne i16 %call, 0, !dbg !13
36    br i1 %tobool, label %if.then, label %if.end, !dbg !13
37
38  if.then:                                          ; preds = %entry
39    %conv2 = sext i16 %conv1 to i32, !dbg !13
40    %add3 = add nsw i32 %conv2, 1, !dbg !13
41    %conv4 = trunc i32 %add3 to i16, !dbg !13
42    call void @llvm.dbg.value(metadata i16 %conv4, metadata !12, metadata !DIExpression()), !dbg !13
43    br label %if.end, !dbg !13
44
45  if.end:                                           ; preds = %if.then, %entry
46    %bar.addr.0 = phi i16 [ %conv4, %if.then ], [ %conv1, %entry ], !dbg !13
47    call void @llvm.dbg.value(metadata i16 %bar.addr.0, metadata !12, metadata !DIExpression()), !dbg !13
48    %conv5 = sext i16 %baz to i32, !dbg !13
49    %conv6 = sext i16 %bar.addr.0 to i32, !dbg !13
50    %add7 = add nsw i32 %conv6, %conv5, !dbg !13
51    %conv8 = trunc i32 %add7 to i16, !dbg !13
52    call void @llvm.dbg.value(metadata i16 %conv8, metadata !12, metadata !DIExpression()), !dbg !13
53    call void @ext(i16 signext %conv8), !dbg !13
54    %conv9 = sext i16 %conv8 to i32, !dbg !13
55    ret i32 %conv9, !dbg !13
56  }
57
58  ; Function Attrs: nounwind readnone speculatable willreturn
59  declare void @llvm.dbg.declare(metadata, metadata, metadata)
60
61  declare dso_local void @ext(i16 signext)
62
63  declare dso_local signext i16 @getlong()
64
65  ; Function Attrs: nounwind readnone speculatable willreturn
66  declare void @llvm.dbg.value(metadata, metadata, metadata)
67
68  !llvm.dbg.cu = !{!0}
69  !llvm.module.flags = !{!3, !4, !5}
70  !llvm.ident = !{!6}
71
72  !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 12.0.0 (git@github.com:llvm/llvm-project 79a35789efdf2378f97642ae4a5f3099b9087a11)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
73  !1 = !DIFile(filename: "test.c", directory: "/fast/fs/llvm3/llvm/test/DebugInfo/MIR/InstrRef")
74  !2 = !{}
75  !3 = !{i32 7, !"Dwarf Version", i32 4}
76  !4 = !{i32 2, !"Debug Info Version", i32 3}
77  !5 = !{i32 1, !"wchar_size", i32 4}
78  !6 = !{!"clang version 12.0.0 (git@github.com:llvm/llvm-project 79a35789efdf2378f97642ae4a5f3099b9087a11)"}
79  !7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 3, type: !8, scopeLine: 3, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
80  !8 = !DISubroutineType(types: !9)
81  !9 = !{!10, !11, !11}
82  !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
83  !11 = !DIBasicType(name: "short", size: 16, encoding: DW_ATE_signed)
84  !12 = !DILocalVariable(name: "bar", arg: 1, scope: !7, file: !1, line: 3, type: !11)
85  !13 = !DILocation(line: 0, scope: !7)
86  !14 = !DILocalVariable(name: "baz", arg: 2, scope: !7, file: !1, line: 3, type: !11)
87  !15 = distinct !DILexicalBlock(scope: !7, file: !1, line: 8, column: 7)
88
89...
90---
91name:            foo
92alignment:       16
93tracksRegLiveness: true
94debugInstrRef: true
95liveins:
96  - { reg: '$edi', virtual-reg: '%3' }
97  - { reg: '$esi', virtual-reg: '%4' }
98frameInfo:
99  maxAlignment:    1
100  adjustsStack:    true
101  hasCalls:        true
102machineFunctionInfo: {}
103body:             |
104  bb.0.entry:
105    liveins: $edi, $esi
106
107    %4:gr32 = COPY $esi
108    %3:gr32 = COPY $edi
109    %6:gr16 = COPY %4.sub_16bit
110    %5:gr16 = COPY %3.sub_16bit
111    ADJCALLSTACKDOWN64 0, 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13
112    %15:gr32 = MOVSX32rr16 %5, debug-location !13
113    $edi = COPY %15, debug-location !13
114    CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $edi, debug-location !13
115    ADJCALLSTACKUP64 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13
116    %14:gr32 = MOVSX32rr16 %5, debug-location !13
117    %13:gr32 = ADD32ri8 killed %14, 12, implicit-def $eflags, debug-location !13
118    %11:gr16 = COPY killed %13.sub_16bit, debug-location !13
119    ADJCALLSTACKDOWN64 0, 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13
120    %9:gr32 = MOVSX32rr16 %11, debug-location !13
121    $edi = COPY %9, debug-location !13
122    CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $edi, debug-location !13
123    ADJCALLSTACKUP64 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13
124    ADJCALLSTACKDOWN64 0, 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13
125    CALL64pcrel32 @getlong, csr_64, implicit $rsp, implicit $ssp, implicit-def $ax, debug-location !13
126    ADJCALLSTACKUP64 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13
127    %8:gr16 = COPY $ax, debug-location !13
128    CMP16ri8 %8, 0, implicit-def $eflags, debug-location !13
129    JCC_1 %bb.2, 4, implicit $eflags, debug-location !13
130
131  ; DOESCOALESCE-LABEL: bb.1.if.then:
132  ; CHECK-LABEL:        bb.1.if.then:
133  bb.1.if.then:
134    %20:gr32 = MOVSX32rr16 %11, debug-location !13
135    %19:gr32 = ADD32ri8 killed %20, 1, implicit-def $eflags, debug-location !13
136    %17:gr16 = COPY killed %19.sub_16bit, debug-location !13
137
138  ; Verify that vreg 17 is coalesced into a gr32, and not copied any further.
139  ; DOESCOALESCE:       %{{[0-9]+}}:gr32 = ADD32ri8
140  ; DOESCOALESCE-NOT:   COPY
141  ; Verify those registers land in $bx
142  ; CHECK:              renamable $ebp = ADD32ri8
143
144  ; DOESCOALESCE-LABEL: bb.2.if.end:
145  ; CHECK-LABEL:        bb.2.if.end:
146  bb.2.if.end:
147    %2:gr16 = PHI %11, %bb.0, %17, %bb.1, debug-instr-number 1, debug-location !13
148  ; CHECK:              DBG_PHI $bp, 1
149    DBG_INSTR_REF !12, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(1, 0), debug-location !13
150    %31:gr32 = MOVSX32rr16 %6, debug-location !13
151    %30:gr32 = MOVSX32rr16 killed %2, debug-location !13
152    %29:gr32 = ADD32rr killed %30, killed %31, implicit-def $eflags, debug-location !13
153    %26:gr16 = COPY killed %29.sub_16bit, debug-location !13
154    ADJCALLSTACKDOWN64 0, 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13
155    %24:gr32 = MOVSX32rr16 %26, debug-location !13
156    $edi = COPY %24, debug-location !13
157    CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $edi, debug-location !13
158    ADJCALLSTACKUP64 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13
159    %23:gr32 = MOVSX32rr16 %26, debug-location !13
160    $eax = COPY %23, debug-location !13
161    RET64 implicit $eax, debug-location !13
162
163...
164