From: Rafael Espindola <rafael.espindola@gmail.com>
Date: Wed, 10 Aug 2011 16:26:42 +0000 (+0000)
Subject: Add support for the R and Q constraints.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=f5ade5d39abe5cb12a8202c604321d5992e4a168;p=oota-llvm.git

Add support for the R and Q constraints.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137217 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/ARM/ARMAsmPrinter.cpp b/lib/Target/ARM/ARMAsmPrinter.cpp
index 559d4af4de0..84a7af537fc 100644
--- a/lib/Target/ARM/ARMAsmPrinter.cpp
+++ b/lib/Target/ARM/ARMAsmPrinter.cpp
@@ -469,14 +469,34 @@ bool ARMAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNum,
 
       return false;
     }
+    case 'R': // The most significant register of a pair.
+    case 'Q': { // The least significant register of a pair.
+      if (OpNum == 0)
+        return true;
+      const MachineOperand &FlagsOP = MI->getOperand(OpNum - 1);
+      if (!FlagsOP.isImm())
+        return true;
+      unsigned Flags = FlagsOP.getImm();
+      unsigned NumVals = InlineAsm::getNumOperandRegisters(Flags);
+      if (NumVals != 2)
+        return true;
+      unsigned RegOp = ExtraCode[0] == 'Q' ? OpNum : OpNum + 1;
+      if (RegOp >= MI->getNumOperands())
+        return true;
+      const MachineOperand &MO = MI->getOperand(RegOp);
+      if (!MO.isReg())
+        return true;
+      unsigned Reg = MO.getReg();
+      O << ARMInstPrinter::getRegisterName(Reg);
+      return false;
+    }
+
     // These modifiers are not yet supported.
     case 'p': // The high single-precision register of a VFP double-precision
               // register.
     case 'e': // The low doubleword register of a NEON quad register.
     case 'f': // The high doubleword register of a NEON quad register.
     case 'h': // A range of VFP/NEON registers suitable for VLD1/VST1.
-    case 'Q': // The least significant register of a pair.
-    case 'R': // The most significant register of a pair.
     case 'H': // The highest-numbered register of a pair.
       return true;
     }
diff --git a/test/CodeGen/ARM/inlineasm4.ll b/test/CodeGen/ARM/inlineasm4.ll
new file mode 100644
index 00000000000..9ed4b997a63
--- /dev/null
+++ b/test/CodeGen/ARM/inlineasm4.ll
@@ -0,0 +1,17 @@
+; RUN: llc < %s -march=arm | FileCheck %s
+
+define double @f(double %x) {
+entry:
+  %0 = tail call double asm "mov     ${0:R}, #4\0A", "=&r"()
+  ret double %0
+; CHECK: f:
+; CHECK:	mov     r1, #4
+}
+
+define double @g(double %x) {
+entry:
+  %0 = tail call double asm "mov     ${0:Q}, #4\0A", "=&r"()
+  ret double %0
+; CHECK: g:
+; CHECK:	mov     r0, #4
+}