[PATCH] D116090: [X86][MS-InlineAsm] Use exact conditions to recognize MS global variables

[Phoebe Wang via Phabricator via llvm-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rG24c68ea1eb4f: Reland "[X86][MS-InlineAsm] Use exact conditions to recognize MS global… (authored by pengfei).

Changed prior to commit:
  https://reviews.llvm.org/D116090?vs=395962&id=396145#toc

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D116090/new/

https://reviews.llvm.org/D116090

Files:
  clang/test/CodeGen/ms-inline-asm-functions.c
  llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
  llvm/lib/Target/X86/AsmParser/X86Operand.h


Index: llvm/lib/Target/X86/AsmParser/X86Operand.h
===================================================================
--- llvm/lib/Target/X86/AsmParser/X86Operand.h
+++ llvm/lib/Target/X86/AsmParser/X86Operand.h
@@ -286,10 +286,9 @@
   bool isOffsetOfLocal() const override { return isImm() && Imm.LocalRef; }
 
   bool isMemPlaceholder(const MCInstrDesc &Desc) const override {
-    // Add more restrictions to avoid the use of global symbols. This helps
-    // with reducing the code size.
-    return !Desc.isRematerializable() && !Desc.isCall() && isMem() &&
-           !Mem.BaseReg && !Mem.IndexReg;
+    // Only MS InlineAsm uses global variables with registers rather than
+    // rip/eip.
+    return isMem() && !Mem.DefaultBaseReg && Mem.FrontendSize;
   }
 
   bool needAddressOf() const override { return AddressOf; }
Index: llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
===================================================================
--- llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
+++ llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
@@ -1759,7 +1759,8 @@
   // registers in a mmory expression, and though unaccessible via rip/eip.
   if (IsGlobalLV && (BaseReg || IndexReg)) {
     Operands.push_back(X86Operand::CreateMem(getPointerWidth(), Disp, Start,
-                                             End, Size, Identifier, Decl));
+                                             End, Size, Identifier, Decl,
+                                             FrontendSize));
     return false;
   }
   // Otherwise, we set the base register to a non-zero value
Index: clang/test/CodeGen/ms-inline-asm-functions.c
===================================================================
--- clang/test/CodeGen/ms-inline-asm-functions.c
+++ clang/test/CodeGen/ms-inline-asm-functions.c
@@ -39,7 +39,7 @@
 int baz() {
   // CHECK-LABEL: _baz:
   __asm mov eax, k;
-  // CHECK: movl    k, %eax
+  // CHECK: movl    _k, %eax
   __asm mov eax, kptr;
   // CHECK: movl    _kptr, %eax
 }


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