# 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
#
# Pass a PHI node into register allocation, and test that it is correctly
# dropped. In this test the desired value is an 8 bit copy of an argument,
# but it's located in an upper subregister field. That coalesces back to the
# whole argument, which is spilt to the stack.
#
# Currently, DBG_PHIs can't describe non-zero offsets in stack slots, therefore
# no DBG_PHI should be emitted. (This means there is no value for that
# instruction/operand number, and any DBG_INSTR_REF will become a
# DBG_VALUE $noreg.
--- |
; ModuleID = 'promoted.ll'
source_filename = "test.c"
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
define dso_local i32 @foo(i32 %bar, i32 %baz) !dbg !7 {
entry:
ret i32 0, !dbg !19
}
declare dso_local i32 @ext(i32)
; Function Attrs: nounwind readnone speculatable willreturn
declare void @llvm.dbg.value(metadata, metadata, metadata)
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5}
!llvm.ident = !{!6}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
!1 = !DIFile(filename: "test.c", directory: ".")
!2 = !{}
!3 = !{i32 7, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{i32 1, !"wchar_size", i32 4}
!6 = !{!"."}
!7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 2, type: !8, scopeLine: 2, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
!8 = !DISubroutineType(types: !9)
!9 = !{!10, !10, !10}
!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!11 = !DILocalVariable(name: "bar", arg: 1, scope: !7, file: !1, line: 2, type: !10)
!12 = !DILocation(line: 0, scope: !7)
!13 = !DILocalVariable(name: "baz", arg: 2, scope: !7, file: !1, line: 2, type: !10)
!14 = !DILocalVariable(name: "either", scope: !7, file: !1, line: 3, type: !10)
!15 = !DILocation(line: 4, column: 7, scope: !16)
!16 = distinct !DILexicalBlock(scope: !7, file: !1, line: 4, column: 7)
!17 = !DILocation(line: 4, column: 7, scope: !7)
!18 = !DILocation(line: 0, scope: !16)
!19 = !DILocation(line: 9, column: 3, scope: !7)
...
---
name: foo
alignment: 16
tracksRegLiveness: true
debugInstrRef: true
registers:
- { id: 0, class: gr8 }
- { id: 1, class: gr32_abcd }
- { id: 2, class: gr32_abcd }
- { id: 3, class: gr32 }
- { id: 4, class: gr32 }
liveins:
- { reg: '$edi', virtual-reg: '%1' }
- { reg: '$esi', virtual-reg: '%2' }
frameInfo:
maxAlignment: 1
adjustsStack: true
hasCalls: true
machineFunctionInfo: {}
body: |
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_abcd = COPY killed $esi
%1:gr32_abcd = COPY killed $edi
%5:gr8 = COPY %1.sub_8bit_hi
%6:gr8 = COPY %1.sub_8bit_hi
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:gr8 = 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 !14, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(1, 0), debug-location !12
; CHECK-NOT: DBG_PHI
; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(1, 0)
; CHECK-NOT: DBG_PHI
$eax = COPY killed %0, debug-location !19
RET 0, killed $eax, debug-location !19
...
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