--- /dev/null
+# RUN: llc -debug-entry-values -start-after=livedebugvalues -o - %s | FileCheck %s
+
+# This test would previously trigger an assertion when trying to describe the
+# call site value for callee()'s float parameter.
+#
+# Please note that at the time of creating this test the SystemZ target did not
+# support call site information, so the "callSites" array has been manually
+# added. For now, verify that we don't crash, and that no (invalid) call site
+# parameter entry is emitted, but later on when call site information is added
+# to the target the LZER instruction should be properly described.
+
+# CHECK-NOT: DW_TAG_GNU_call_site_parameter
+
+# Based on the following C reproducer:
+#
+# extern void callee(float);
+# int caller() {
+# callee(0);
+# return 0;
+# }
+
+--- |
+ target datalayout = "E-m:e-i1:8:16-i8:8:16-i64:64-f128:64-a:8:16-n32:64"
+ target triple = "systemz"
+
+ ; Function Attrs: nounwind
+ define signext i32 @caller() !dbg !12 {
+ entry:
+ tail call void @callee(float 0.000000e+00), !dbg !16
+ ret i32 0, !dbg !17
+ }
+
+ declare !dbg !4 void @callee(float)
+
+ !llvm.dbg.cu = !{!0}
+ !llvm.module.flags = !{!8, !9, !10}
+ !llvm.ident = !{!11}
+
+ !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3, nameTableKind: None)
+ !1 = !DIFile(filename: "systemz-lzer.c", directory: "/")
+ !2 = !{}
+ !3 = !{!4}
+ !4 = !DISubprogram(name: "callee", scope: !1, file: !1, line: 1, type: !5, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !2)
+ !5 = !DISubroutineType(types: !6)
+ !6 = !{null, !7}
+ !7 = !DIBasicType(name: "float", size: 32, encoding: DW_ATE_float)
+ !8 = !{i32 2, !"Dwarf Version", i32 4}
+ !9 = !{i32 2, !"Debug Info Version", i32 3}
+ !10 = !{i32 1, !"wchar_size", i32 4}
+ !11 = !{!"clang version 10.0.0"}
+ !12 = distinct !DISubprogram(name: "caller", scope: !1, file: !1, line: 2, type: !13, scopeLine: 2, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !2)
+ !13 = !DISubroutineType(types: !14)
+ !14 = !{!15}
+ !15 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+ !16 = !DILocation(line: 3, scope: !12)
+ !17 = !DILocation(line: 4, scope: !12)
+
+...
+---
+name: caller
+tracksRegLiveness: true
+callSites:
+ - { bb: 0, offset: 9, fwdArgRegs:
+ - { arg: 0, reg: '$f0s' } }
+body: |
+ bb.0.entry:
+ liveins: $r11d, $r15d, $r14d
+
+ STMG killed $r11d, killed $r15d, $r15d, 88, implicit killed $r14d
+ CFI_INSTRUCTION offset $r11d, -72
+ CFI_INSTRUCTION offset $r14d, -48
+ CFI_INSTRUCTION offset $r15d, -40
+ $r15d = AGHI $r15d, -160, implicit-def dead $cc
+ CFI_INSTRUCTION def_cfa_offset 320
+ $r11d = LGR $r15d
+ CFI_INSTRUCTION def_cfa_register $r11d
+ renamable $f0s = LZER
+ CallBRASL @callee, $f0s, csr_systemz, implicit-def dead $r14d, implicit-def dead $cc, implicit $fpc, debug-location !16
+ $r2d = LGHI 0, debug-location !17
+ $r11d, $r15d = LMG $r11d, 248, implicit-def $r14d, debug-location !17
+ Return implicit killed $r2d, debug-location !17
+
+...