test/DebugInfo/MIR/InstrRef/phi-on-stack-coalesced.mir

# RUN: llc %s -o - -mtriple=x86_64-unknown-unknown \
# RUN:    -experimental-debug-variable-locations \
# RUN:    -start-before=phi-node-elimination -stop-after=virtregrewriter \
# RUN:    | FileCheck %s
#
# Like phi-through-regalloc.mir, pass a PHI node into register allocation, and
# test that it correctly comes out, in a stack slot. In this test the desired
# value is a 16 bit copy of an argument, and the PHI register class is 16 bits.
# It's subsequently coalesced into a larger vreg, which is then spilt as a 32
# bit value.
# Test that the coalescing happens (32 bits stored and loaded), but that we
# record in the relevant DBG_PHI that the original value was 16 bits in size.
# This avoids later ambiguity about how large the value on the stack is.

--- |
  ; ModuleID = 'promoted.ll'
  source_filename = "test.c"
  target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
  target triple = "x86_64-unknown-linux-gnu"

  define dso_local i32 @foo(i32 %bar, i32 %baz) !dbg !7 {
  entry:
    ret i32 0, !dbg !19
  }

  declare dso_local i32 @ext(i32)

  ; Function Attrs: nounwind readnone speculatable willreturn
  declare void @llvm.dbg.value(metadata, metadata, metadata)

  !llvm.dbg.cu = !{!0}
  !llvm.module.flags = !{!3, !4, !5}
  !llvm.ident = !{!6}

  !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
  !1 = !DIFile(filename: "test.c", directory: ".")
  !2 = !{}
  !3 = !{i32 7, !"Dwarf Version", i32 4}
  !4 = !{i32 2, !"Debug Info Version", i32 3}
  !5 = !{i32 1, !"wchar_size", i32 4}
  !6 = !{!"."}
  !7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 2, type: !8, scopeLine: 2, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
  !8 = !DISubroutineType(types: !9)
  !9 = !{!10, !10, !10}
  !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
  !11 = !DILocalVariable(name: "bar", arg: 1, scope: !7, file: !1, line: 2, type: !10)
  !12 = !DILocation(line: 0, scope: !7)
  !13 = !DILocalVariable(name: "baz", arg: 2, scope: !7, file: !1, line: 2, type: !10)
  !14 = !DILocalVariable(name: "either", scope: !7, file: !1, line: 3, type: !10)
  !15 = !DILocation(line: 4, column: 7, scope: !16)
  !16 = distinct !DILexicalBlock(scope: !7, file: !1, line: 4, column: 7)
  !17 = !DILocation(line: 4, column: 7, scope: !7)
  !18 = !DILocation(line: 0, scope: !16)
  !19 = !DILocation(line: 9, column: 3, scope: !7)

...
---
name:            foo
alignment:       16
tracksRegLiveness: true
registers:
  - { id: 0, class: gr16 }
  - { id: 1, class: gr32 }
  - { id: 2, class: gr32 }
  - { id: 3, class: gr32 }
  - { id: 4, class: gr32 }
liveins:
  - { reg: '$edi', virtual-reg: '%1' }
  - { reg: '$esi', virtual-reg: '%2' }
frameInfo:
  maxAlignment:    1
  hasCalls:        true
machineFunctionInfo: {}
body:             |
  ; CHECK-LABEL: bb.0:
  ; CHECK:       MOV32mr %stack.0, 1, $noreg, 0, $noreg, $edi
  bb.0:
    successors: %bb.2(0x50000000), %bb.1(0x30000000)
    liveins: $edi, $esi

    DBG_VALUE $edi, $noreg, !11, !DIExpression(), debug-location !12
    DBG_VALUE $esi, $noreg, !13, !DIExpression(), debug-location !12
    %2:gr32 = COPY killed $esi
    %1:gr32 = COPY killed $edi
    %5:gr16 = COPY %1.sub_16bit
    %6:gr16 = COPY %1.sub_16bit
    ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp, debug-location !15
    %3:gr32 = MOV32r0 implicit-def dead $eflags
    $edi = COPY killed %3, debug-location !15
    CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit killed $edi, implicit-def $rsp, implicit-def $ssp, implicit-def $eax, debug-location !15
    ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp, debug-location !15
    %4:gr32 = COPY killed $eax, debug-location !15
    %10:gr32 = MOV32ri 0
    %11:gr32 = MOV32ri 1
    %12:gr32 = MOV32ri 2
    %13:gr32 = MOV32ri 3
    %14:gr32 = MOV32ri 4
    %15:gr32 = MOV32ri 5
    %16:gr32 = MOV32ri 6
    %17:gr32 = MOV32ri 7
    %18:gr32 = MOV32ri 8
    %19:gr32 = MOV32ri 9
    %20:gr32 = MOV32ri 10
    %21:gr32 = MOV32ri 11
    %22:gr32 = MOV32ri 12
    %23:gr32 = MOV32ri 13
    %24:gr32 = MOV32ri 14
    TEST32rr killed %4, %4, implicit-def $eflags, debug-location !15
    JCC_1 %bb.2, 5, implicit killed $eflags, debug-location !17
    JMP_1 %bb.1, debug-location !17

  bb.1:
    %30:gr32 = MOV32ri 0
    %31:gr32 = MOV32ri 1
    %32:gr32 = MOV32ri 2
    %33:gr32 = MOV32ri 3
    %34:gr32 = MOV32ri 4
    %35:gr32 = MOV32ri 5
    %36:gr32 = MOV32ri 6
    %37:gr32 = MOV32ri 7
    %38:gr32 = MOV32ri 8
    %39:gr32 = MOV32ri 9
    %40:gr32 = MOV32ri 10
    %41:gr32 = MOV32ri 11
    %42:gr32 = MOV32ri 12
    %43:gr32 = MOV32ri 13
    %44:gr32 = MOV32ri 14

    ; CHECK-LABEL: bb.2:
  bb.2:
    %0:gr16 = PHI %5, %bb.0, %6, %bb.1, debug-instr-number 1, debug-location !18
    %50:gr32 = PHI %10, %bb.0, %30, %bb.1, debug-location !18
    %51:gr32 = PHI %11, %bb.0, %31, %bb.1, debug-location !18
    %52:gr32 = PHI %12, %bb.0, %32, %bb.1, debug-location !18
    %53:gr32 = PHI %13, %bb.0, %33, %bb.1, debug-location !18
    %54:gr32 = PHI %14, %bb.0, %34, %bb.1, debug-location !18
    %55:gr32 = PHI %15, %bb.0, %35, %bb.1, debug-location !18
    %56:gr32 = PHI %16, %bb.0, %36, %bb.1, debug-location !18
    %57:gr32 = PHI %17, %bb.0, %37, %bb.1, debug-location !18
    %58:gr32 = PHI %18, %bb.0, %38, %bb.1, debug-location !18
    %59:gr32 = PHI %19, %bb.0, %39, %bb.1, debug-location !18
    %60:gr32 = PHI %20, %bb.0, %40, %bb.1, debug-location !18
    %61:gr32 = PHI %21, %bb.0, %41, %bb.1, debug-location !18
    %62:gr32 = PHI %22, %bb.0, %42, %bb.1, debug-location !18
    %63:gr32 = PHI %23, %bb.0, %43, %bb.1, debug-location !18
    %64:gr32 = PHI %24, %bb.0, %44, %bb.1, debug-location !18

    INLINEASM &"", 1, 12, %50, 12, %51, 12, %52, 12, %53, 12, %54, 12, %55, 12, %56, 12, %57, 12, %58, 12, %59, 12, %60, 12, %61, 12, %62, 12, %63, 12, %64
    DBG_INSTR_REF 1, 0, !14, !DIExpression(), debug-location !12
    ; CHECK:      DBG_PHI %stack.0, 1, 16
    ; CHECK:      DBG_INSTR_REF 1, 0
    ; CHECK:      renamable $eax = MOV32rm %stack.0,
    $eax = COPY killed %0, debug-location !19
    RET 0, killed $eax, debug-location !19

...