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# Check that the backend can produce a load-and-trap instruction also in
# the presence of a DEBUG_VALUE machine instruction.
#
# RUN: llc %s -mtriple=s390x-linux-gnu -mcpu=zEC12 -start-before=postrapseudos \
# RUN: -o - 2>&1 | FileCheck %s
#
# CHECK: lat
--- |
define i32 @f1(i32* %ptr) #1 {
entry:
%val = load i32, i32* %ptr
; Keep the dbg metadata live by referencing it in the IR.
call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !7, metadata !DIExpression()), !dbg !9
%cmp = icmp eq i32 %val, 0
br i1 %cmp, label %if.then, label %if.end
if.then: ; preds = %entry
tail call void @llvm.trap()
unreachable
if.end: ; preds = %entry
ret i32 %val
}
declare void @llvm.trap() #0
declare void @llvm.dbg.value(metadata, i64, metadata, metadata)
declare void @llvm.stackprotector(i8*, i8**) #2
attributes #0 = { cold noreturn nounwind "target-cpu"="zEC12" }
attributes #1 = { "target-cpu"="zEC12" }
attributes #2 = { nounwind }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "llvm", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "test.ll", directory: "/tmp")
!2 = !{}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = distinct !DISubprogram(name: "test_dbg_value", scope: !1, file: !1, line: 1, type: !6, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
!6 = !DISubroutineType(types: !2)
!7 = !DILocalVariable(name: "in", arg: 1, scope: !5, file: !1, line: 1, type: !8)
!8 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!9 = !DILocation(line: 1, column: 1, scope: !5)
...
---
name: f1
alignment: 16
tracksRegLiveness: true
liveins:
- { reg: '$r2d' }
frameInfo:
maxCallFrameSize: 0
body: |
bb.0.entry:
successors: %bb.1(0x00000001), %bb.2(0x7fffffff)
liveins: $r2d
renamable $r2l = LMux killed renamable $r2d, 0, $noreg :: (load (s32) from %ir.ptr)
DBG_VALUE $noreg, $r2l, !7, !DIExpression(), debug-location !9
CHIMux renamable $r2l, 0, implicit-def $cc
DBG_VALUE $noreg, $r2l, !7, !DIExpression(), debug-location !9
BRC 14, 6, %bb.2, implicit killed $cc
bb.1.if.then:
successors:
Trap
bb.2.if.end:
liveins: $r2l
Return implicit $r2l
...
|
