From: Eric Christopher <echristo@apple.com>
Date: Mon, 7 May 2012 05:46:43 +0000 (+0000)
Subject: Add support for the 'N' inline asm constraint.
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=60cfc7908ef6acdfab0ea4af5b2c50087a8f36d8;p=oota-llvm.git

Add support for the 'N' inline asm constraint.

Patch by Jack Carter.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156284 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/Mips/MipsISelLowering.cpp b/lib/Target/Mips/MipsISelLowering.cpp
index 3f445a0cc8c..ded6aa0608b 100644
--- a/lib/Target/Mips/MipsISelLowering.cpp
+++ b/lib/Target/Mips/MipsISelLowering.cpp
@@ -3043,6 +3043,7 @@ MipsTargetLowering::getSingleConstraintMatchWeight(
   case 'J': // integer zero
   case 'K': // unsigned 16 bit immediate
   case 'L': // signed 32 bit immediate where lower 16 bits are 0
+  case 'N': // immediate in the range of -65535 to -1 (inclusive)
     if (isa<ConstantInt>(CallOperandVal))
       weight = CW_Constant;
     break;
@@ -3135,6 +3136,16 @@ void MipsTargetLowering::LowerAsmOperandForConstraint(SDValue Op,
       }
     }
     return;
+  case 'N': // immediate in the range of -65535 to -1 (inclusive)
+    if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
+      EVT Type = Op.getValueType();
+      int64_t Val = C->getSExtValue();
+      if ((Val >= -65535) && (Val <= -1)) {
+        Result = DAG.getTargetConstant(Val, Type);
+        break;
+      }
+    }
+    return;
   }
 
   if (Result.getNode()) {
diff --git a/test/CodeGen/Mips/inlineasm-cnstrnt-bad-N.ll b/test/CodeGen/Mips/inlineasm-cnstrnt-bad-N.ll
new file mode 100644
index 00000000000..770669d913e
--- /dev/null
+++ b/test/CodeGen/Mips/inlineasm-cnstrnt-bad-N.ll
@@ -0,0 +1,17 @@
+ 
+;This is a negative test. The constant value given for the constraint (N).
+;immediate in the range of -65535 to -1 (inclusive).
+;Our example uses the positive value 3.
+;
+; RUN: not llc -march=mipsel < %s  2> %t
+; RUN: FileCheck --check-prefix=CHECK-ERRORS < %t %s
+
+define i32 @main() nounwind {
+entry:
+
+;CHECK-ERRORS:	error: invalid operand for inline asm constraint 'N'
+
+  tail call i32 asm sideeffect "addi $0,$1,$2", "=r,r,N"(i32 7, i32 3) nounwind
+  ret i32 0
+}
+
diff --git a/test/CodeGen/Mips/inlineasm_constraint.ll b/test/CodeGen/Mips/inlineasm_constraint.ll
index 34d0657e35a..06ca7219fe0 100644
--- a/test/CodeGen/Mips/inlineasm_constraint.ll
+++ b/test/CodeGen/Mips/inlineasm_constraint.ll
@@ -33,5 +33,11 @@ entry:
 ; CHECK: #NO_APP	
   tail call i32 asm sideeffect "add $0,$1,$3\0A\09", "=r,r,L,r"(i32 7, i32 1048576, i32 0) nounwind
 
+; Now N with -3
+; CHECK: #APP
+; CHECK: addi ${{[0-9]+}},${{[0-9]+}},-3
+; CHECK: #NO_APP	
+  tail call i32 asm sideeffect "addi $0,$1,$2", "=r,r,N"(i32 7, i32 -3) nounwind
+
   ret i32 0
 }