[X86] [CodeView] Add codeview mappings for registers ST0-ST7

These can end up needed after https://reviews.llvm.org/D116821. Suggested by Alexandre Ganea. Differential Revision: https://reviews.llvm.org/D118072
llvm · Jan 25, 2022 · 70cb8da · 70cb8da
1 parent bca2d85
commit 70cb8da
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diff --git a/llvm/lib/Target/X86/MCTargetDesc/X86MCTargetDesc.cpp b/llvm/lib/Target/X86/MCTargetDesc/X86MCTargetDesc.cpp
@@ -111,6 +111,15 @@ void X86_MC::initLLVMToSEHAndCVRegMapping(MCRegisterInfo *MRI) {
 
       {codeview::RegisterId::EFLAGS, X86::EFLAGS},
 
+      {codeview::RegisterId::ST0, X86::ST0},
+      {codeview::RegisterId::ST1, X86::ST1},
+      {codeview::RegisterId::ST2, X86::ST2},
+      {codeview::RegisterId::ST3, X86::ST3},
+      {codeview::RegisterId::ST4, X86::ST4},
+      {codeview::RegisterId::ST5, X86::ST5},
+      {codeview::RegisterId::ST6, X86::ST6},
+      {codeview::RegisterId::ST7, X86::ST7},
+
       {codeview::RegisterId::ST0, X86::FP0},
       {codeview::RegisterId::ST1, X86::FP1},
       {codeview::RegisterId::ST2, X86::FP2},

diff --git a/llvm/test/DebugInfo/COFF/x87-registers.ll b/llvm/test/DebugInfo/COFF/x87-registers.ll
@@ -0,0 +1,44 @@
+; RUN: llc -experimental-debug-variable-locations=true < %s -filetype=obj | llvm-readobj - --codeview | FileCheck %s
+
+; CHECK:      DefRangeRegisterSym {
+; CHECK-NEXT:   Kind: S_DEFRANGE_REGISTER
+; CHECK-NEXT:   Register: ST0
+
+target datalayout = "e-m:w-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-w64-windows-gnu"
+
+define i32 @a() !dbg !8 {
+entry:
+  call void @llvm.dbg.declare(metadata [6 x i8]* undef, metadata !13, metadata !DIExpression(DW_OP_LLVM_fragment, 80, 48)), !dbg !15
+  %0 = tail call x86_fp80 asm sideeffect "", "={st},~{dirflag},~{fpsr},~{flags}"(), !dbg !16, !srcloc !17
+  call void @llvm.dbg.value(metadata x86_fp80 %0, metadata !13, metadata !DIExpression()), !dbg !18
+  ret i32 undef, !dbg !19
+}
+
+declare void @llvm.dbg.declare(metadata, metadata, metadata)
+declare void @llvm.dbg.value(metadata, metadata, metadata)
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!2, !3, !4, !5, !6}
+!llvm.ident = !{!7}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 14.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)
+!1 = !DIFile(filename: "codeview-fp0.c", directory: "llvm/build")
+!2 = !{i32 2, !"CodeView", i32 1}
+!3 = !{i32 2, !"Debug Info Version", i32 3}
+!4 = !{i32 1, !"wchar_size", i32 2}
+!5 = !{i32 7, !"PIC Level", i32 2}
+!6 = !{i32 7, !"uwtable", i32 1}
+!7 = !{!"clang version 14.0.0"}
+!8 = distinct !DISubprogram(name: "a", scope: !1, file: !1, line: 1, type: !9, scopeLine: 1, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !12)
+!9 = !DISubroutineType(types: !10)
+!10 = !{!11}
+!11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!12 = !{!13}
+!13 = !DILocalVariable(name: "b", scope: !8, file: !1, line: 2, type: !14)
+!14 = !DIBasicType(name: "long double", size: 128, encoding: DW_ATE_float)
+!15 = !DILocation(line: 2, scope: !8)
+!16 = !DILocation(line: 3, scope: !8)
+!17 = !{i64 40}
+!18 = !DILocation(line: 0, scope: !8)
+!19 = !DILocation(line: 4, scope: !8)