[GlobalISel] Ignore %noreg when applying default regbank mapping.

When computing the mapping for non-generic instructions, we skipped
%noreg operands, because we can't always reason about their banks.

Also skip them when applying the mapping.  Otherwise, we could end
up with mappings that we can't apply.

While there, duplicate an assert to distinguish between the two
error conditions.

llvm-svn: 297201

2 files changed, 52 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/GlobalISel/RegisterBankInfo.cpp b/llvm/lib/CodeGen/GlobalISel/RegisterBankInfo.cpp
index 74161e3c6bd..2901761c1cd 100644
--- a/llvm/lib/CodeGen/GlobalISel/RegisterBankInfo.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/RegisterBankInfo.cpp
@@ -352,6 +352,13 @@ void RegisterBankInfo::applyDefaultMapping(const OperandsMapper &OpdMapper) {
       DEBUG(dbgs() << " is not a register, nothing to be done\n");
       continue;
     }
+    if (!MO.getReg()) {
+      DEBUG(dbgs() << " is %%noreg, nothing to be done\n");
+      continue;
+    }
+    assert(OpdMapper.getInstrMapping().getOperandMapping(OpIdx).NumBreakDowns !=
+               0 &&
+           "Invalid mapping");
     assert(OpdMapper.getInstrMapping().getOperandMapping(OpIdx).NumBreakDowns ==
                1 &&
            "This mapping is too complex for this function");
diff --git a/llvm/test/CodeGen/AArch64/GlobalISel/regbankselect-dbg-value.mir b/llvm/test/CodeGen/AArch64/GlobalISel/regbankselect-dbg-value.mir
new file mode 100644
index 00000000000..73d4d205472
--- /dev/null
+++ b/llvm/test/CodeGen/AArch64/GlobalISel/regbankselect-dbg-value.mir
@@ -0,0 +1,45 @@
+# RUN: llc -O0 -mtriple arm64-- -run-pass=regbankselect -global-isel %s -o - | FileCheck %s
+
+--- |
+  target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
+
+  define void @test_dbg_value() !dbg !5 {
+    ; Keep the dbg metadata live by referencing it in the IR.
+    call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !7, metadata !9), !dbg !10
+    ret void
+  }
+
+  declare void @llvm.dbg.value(metadata, i64, metadata, metadata)
+
+  !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, variables: !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 = !DIExpression()
+  !10 = !DILocation(line: 1, column: 1, scope: !5)
+...
+
+---
+# CHECK-LABEL: name: test_dbg_value
+name:            test_dbg_value
+legalized:       true
+# CHECK: registers:
+# CHECK-NEXT:  - { id: 0, class: gpr }
+body: |
+  bb.0:
+    liveins: %w0
+    %0:_(s32) = COPY %w0
+    ; CHECK: DBG_VALUE debug-use %0(s32), debug-use _, !7, !9, debug-location !10
+    DBG_VALUE debug-use %0(s32), debug-use _, !7, !9, debug-location !10
+
+    ; CHECK: DBG_VALUE _, 0, !7, !9, debug-location !10
+    DBG_VALUE _, 0, !7, !9, debug-location !10
+...