Add x86 support for 'n' inline asm modifier. This will be handled target independentl...

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74336 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.cpp b/lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.cpp
index 27f95d8759a35e50bd7a7ad33b0b16db2894ff81..369daf0de042bb8fdd14f178ce7c13363188d1fa 100644 (file)
--- a/lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.cpp
+++ b/lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.cpp
@@ -840,6 +840,17 @@ bool X86ATTAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
     case 'P': // Don't print @PLT, but do print as memory.
       printOperand(MI, OpNo, "mem", /*NotRIPRel=*/true);
       return false;
+
+      case 'n': { // Negate the immediate or print a '-' before the operand.
+      // Note: this is a temporary solution. It should be handled target
+      // independently as part of the 'MC' work.
+      const MachineOperand &MO = MI->getOperand(OpNo);
+      if (MO.isImm()) {
+        O << -MO.getImm();
+        return false;
+      }
+      O << '-';
+    }
     }
   }
 

diff --git a/test/CodeGen/X86/inline-asm-modifier-n.ll b/test/CodeGen/X86/inline-asm-modifier-n.ll
new file mode 100644 (file)
index 0000000..97eac38
--- /dev/null
+++ b/test/CodeGen/X86/inline-asm-modifier-n.ll
@@ -0,0 +1,8 @@
+; RUN: llvm-as < %s | llc -march=x86 | grep { 37}
+; rdar://7008959
+
+define void @bork() nounwind {
+entry:
+       tail call void asm sideeffect "BORK ${0:n}", "i,~{dirflag},~{fpsr},~{flags}"(i32 -37) nounwind
+       ret void
+}