Add support for the 'H' modifier.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122667 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/X86/X86AsmPrinter.cpp

@@ -302,6 +302,9 @@ void X86AsmPrinter::printLeaMemReference(const MachineInstr *MI, unsigned Op,
     printSymbolOperand(MI->getOperand(Op+3), O);
   }
 
+  if (Modifier && strcmp(Modifier, "H") == 0)
+    O << "+8";
+
   if (HasParenPart) {
     assert(IndexReg.getReg() != X86::ESP &&
            "X86 doesn't allow scaling by ESP");
@@ -458,6 +461,9 @@ bool X86AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
     case 'q': // Print SImode register
       // These only apply to registers, ignore on mem.
       break;
+    case 'H':
+      printMemReference(MI, OpNo, O, "H");
+      return false;
     case 'P': // Don't print @PLT, but do print as memory.
       printMemReference(MI, OpNo, O, "no-rip");
       return false;

test/CodeGen/X86/inline-asm-h.ll

@@ -0,0 +1,12 @@
+; RUN: llc -march=x86-64 < %s | FileCheck %s
+
+@foobar = common global i32 0, align 4
+
+define void @zed() nounwind {
+entry:
+  call void asm "movq %mm2,${0:H}", "=*m,~{dirflag},~{fpsr},~{flags}"(i32* @foobar) nounwind
+  ret void
+}
+
+; CHECK: zed
+; CHECK: movq %mm2,foobar+8(%rip)