# RUN: llc %s -o - -mtriple=x86_64-unknown-unknown \
# RUN: -experimental-debug-variable-locations \
# RUN: -run-pass=phi-node-elimination,simple-register-coalescing \
# RUN: | FileCheck %s --check-prefix=DOESCOALESCE
# RUN: llc %s -o - -mtriple=x86_64-unknown-unknown \
# RUN: -experimental-debug-variable-locations \
# RUN: -run-pass=phi-node-elimination,simple-register-coalescing,livedebugvars,greedy,virtregrewriter \
# RUN: | FileCheck %s --check-prefix=CHECK
#
# Test that a PHI with a debug instruction number attached survives register
# coalescing, when its vreg gets coalesced. This test comes in two parts, first
# that coalescing actually happens, second that a DBG_PHI is still produced
# afterwards.
#
# Original C code, the PHI is of the value of 'bar' after the control flow.
# Compiled at -O0, applied -mem2reg, llc -O0, then manually added the PHI
# instruction label. Additional variable locations removed.
#
# void ext(long);
# long getlong(void);
# int foo(long bar, long baz) {
# ext(bar);
# bar += 12;
# ext(bar);
#
# if (getlong())
# bar += 1;
#
# bar += baz;
# ext(bar);
# return bar;
# }
#
--- |
; 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(i64 %bar, i64 %baz) !dbg !7 {
entry:
call void @llvm.dbg.value(metadata i64 %bar, metadata !12, metadata !DIExpression()), !dbg !13
call void @llvm.dbg.value(metadata i64 %baz, metadata !14, metadata !DIExpression()), !dbg !13
call void @ext(i64 %bar), !dbg !13
%add = add nsw i64 %bar, 12, !dbg !13
call void @llvm.dbg.value(metadata i64 %add, metadata !12, metadata !DIExpression()), !dbg !13
call void @ext(i64 %add), !dbg !13
%call = call i64 @getlong(), !dbg !13
%tobool = icmp ne i64 %call, 0, !dbg !13
br i1 %tobool, label %if.then, label %if.end, !dbg !13
if.then: ; preds = %entry
%add1 = add nsw i64 %add, 1, !dbg !13
call void @llvm.dbg.value(metadata i64 %add1, metadata !12, metadata !DIExpression()), !dbg !13
br label %if.end, !dbg !13
if.end: ; preds = %if.then, %entry
%bar.addr.0 = phi i64 [ %add1, %if.then ], [ %add, %entry ], !dbg !13
call void @llvm.dbg.value(metadata i64 %bar.addr.0, metadata !12, metadata !DIExpression()), !dbg !13
%add2 = add nsw i64 %bar.addr.0, %baz, !dbg !13
call void @llvm.dbg.value(metadata i64 %add2, metadata !12, metadata !DIExpression()), !dbg !13
call void @ext(i64 %add2), !dbg !13
%conv = trunc i64 %add2 to i32, !dbg !13
ret i32 %conv, !dbg !13
}
; Function Attrs: nounwind readnone speculatable willreturn
declare void @llvm.dbg.declare(metadata, metadata, metadata)
declare dso_local void @ext(i64)
declare dso_local i64 @getlong()
; 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, isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
!1 = !DIFile(filename: "test.c", directory: "/tmp/out.c")
!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: 3, type: !8, scopeLine: 3, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
!8 = !DISubroutineType(types: !9)
!9 = !{!10, !11, !11}
!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!11 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed)
!12 = !DILocalVariable(name: "bar", arg: 1, scope: !7, file: !1, line: 3, type: !11)
!13 = !DILocation(line: 0, scope: !7)
!14 = !DILocalVariable(name: "baz", arg: 2, scope: !7, file: !1, line: 3, type: !11)
!15 = distinct !DILexicalBlock(scope: !7, file: !1, line: 8, column: 7)
...
---
name: foo
alignment: 16
tracksRegLiveness: true
liveins:
- { reg: '$rdi', virtual-reg: '%3' }
- { reg: '$rsi', virtual-reg: '%5' }
frameInfo:
maxAlignment: 1
hasCalls: true
machineFunctionInfo: {}
body: |
bb.0.entry:
liveins: $rdi, $rsi
%5:gr64 = COPY $rsi
%3:gr64 = COPY $rdi
%4:gr64 = COPY killed %3
%6:gr64 = COPY killed %5
ADJCALLSTACKDOWN64 0, 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13
$rdi = COPY %4, debug-location !13
CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !13
ADJCALLSTACKUP64 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13
%9:gr64 = ADD64ri32 %4, 12, implicit-def $eflags, debug-location !13
ADJCALLSTACKDOWN64 0, 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13
$rdi = COPY %9, debug-location !13
CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !13
ADJCALLSTACKUP64 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13
ADJCALLSTACKDOWN64 0, 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13
CALL64pcrel32 @getlong, csr_64, implicit $rsp, implicit $ssp, implicit-def $rax, debug-location !13
ADJCALLSTACKUP64 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13
%8:gr64 = COPY $rax, debug-location !13
CMP64ri8 %8, 0, implicit-def $eflags, debug-location !13
JCC_1 %bb.2, 4, implicit $eflags, debug-location !13
; DOESCOALESCE-LABEL: bb.1.if.then:
; CHECK-LABEL: bb.1.if.then:
bb.1.if.then:
%10:gr64 = ADD64ri32 %9, 1, implicit-def $eflags, debug-location !13
; Verify that the vreg is different immediately after register coalescing.
; DOESCOALESCE-NOT: %10:gr64 ADD64ri32
; DOESCOALESCE: %{{[0-9]+}}:gr64 = ADD64ri32
; Verify that all these registers land in rbx.
; CHECK: renamable $rbx = ADD64ri32 killed renamable $rbx
; DOESCOALESCE-LABEL: bb.2.if.end:
; CHECK-LABEL: bb.2.if.end:
bb.2.if.end:
%2:gr64 = PHI %9, %bb.0, %10, %bb.1, debug-instr-number 1, debug-location !13
; CHECK: DBG_PHI $rbx, 1
DBG_INSTR_REF 1, 0, !12, !DIExpression(), debug-location !13
%14:gr64 = ADD64rr killed %2, %6, implicit-def $eflags, debug-location !13
ADJCALLSTACKDOWN64 0, 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13
$rdi = COPY %14, debug-location !13
CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !13
ADJCALLSTACKUP64 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13
%13:gr32 = COPY %14.sub_32bit, debug-location !13
$eax = COPY %13, debug-location !13
RET64 implicit $eax, debug-location !13
...