# RUN: llc -mtriple=x86_64-none-linux-gnu -run-pass=postra-machine-sink -verify-machineinstrs -o - %s | FileCheck %s
#
# This test was originally generated from the following sample:
#
# int x0;
# extern void x3(int, int);
# void x1(int x2) {
# if (x0)
# x3(0, x2);
# }
#
# The code generates a COPY instruction which the PostRA Machine Sink pass will
# try to sink. Earlier versions were not performing the sink due to a
# DBG_VALUE instruction confusing the sinking algorithm.
--- |
@x0 = common dso_local global i32 0, align 4, !dbg !0
define dso_local void @x1(i32) !dbg !11 {
%2 = alloca i32, align 4
store i32 %0, ptr %2, align 4
call void @llvm.dbg.declare(metadata ptr %2, metadata !14, metadata !DIExpression()), !dbg !16
%3 = load i32, ptr @x0, align 4, !dbg !16
%4 = icmp ne i32 %3, 0, !dbg !16
br i1 %4, label %5, label %7, !dbg !16
; <label>:5: ; preds = %1
%6 = load i32, ptr %2, align 4, !dbg !16
call void @x3(i32 0, i32 %6), !dbg !16
br label %7, !dbg !16
; <label>:7: ; preds = %5, %1
ret void, !dbg !16
}
declare void @llvm.dbg.declare(metadata, metadata, metadata)
declare dso_local void @x3(i32, i32)
!llvm.dbg.cu = !{!2}
!llvm.module.flags = !{!7, !8}
!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = distinct !DIGlobalVariable(name: "x0", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
!3 = !DIFile(filename: "test.c", directory: "")
!4 = !{}
!5 = !{!0}
!6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!7 = !{i32 2, !"Dwarf Version", i32 4}
!8 = !{i32 2, !"Debug Info Version", i32 3}
!11 = distinct !DISubprogram(name: "x1", scope: !3, file: !3, line: 3, type: !12, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !2)
!12 = !DISubroutineType(types: !13)
!13 = !{null, !6}
!14 = !DILocalVariable(name: "x2", arg: 1, scope: !11, file: !3, line: 3, type: !6)
!15 = distinct !DILexicalBlock(scope: !11, file: !3, line: 4, column: 7)
!16 = !DILocation(line: 4, column: 7, scope: !15)
...
---
# CHECK: name: x1
# CHECK: bb.0:
# CHECK-NOT: $eax = COPY $edi
# CHECK: bb.1:
# CHECK: renamable $eax = COPY $edi
# CHECK-NEXT: DBG_VALUE $eax,
# CHECK: bb.2:
name: x1
alignment: 16
tracksRegLiveness: true
body: |
bb.0:
successors: %bb.2, %bb.1; %bb.2, %bb.1
liveins: $edi
DBG_VALUE $edi, $noreg, !14, !DIExpression(), debug-location !16
renamable $eax = COPY $edi
DBG_VALUE $eax, $noreg, !14, !DIExpression(), debug-location !16
CMP32mi8 $rip, 1, $noreg, @x0, $noreg, 0, implicit-def $eflags, debug-location !16
JCC_1 %bb.2, 4, implicit killed $eflags, debug-location !16
JMP_1 %bb.1, debug-location !16
bb.1:
liveins: $eax
$edi = MOV32r0 implicit-def dead $eflags, debug-location !16
$esi = COPY killed renamable $eax, debug-location !16
bb.2:
RET 0, debug-location !16
...
Codebase Browser
llvm