From: Eric Christopher <echristo@apple.com>
Date: Mon, 7 May 2012 05:46:29 +0000 (+0000)
Subject: Add support for the inline asm constraint 'K'.
X-Git-Url: http://plrg.eecs.uci.edu/git/?p=oota-llvm.git;a=commitdiff_plain;h=f49f846eec471ca64a72c151dbaa62a9306d4e37

Add support for the inline asm constraint 'K'.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156282 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/Mips/MipsISelLowering.cpp b/lib/Target/Mips/MipsISelLowering.cpp
index 97332cf00d1..d056f542e70 100644
--- a/lib/Target/Mips/MipsISelLowering.cpp
+++ b/lib/Target/Mips/MipsISelLowering.cpp
@@ -3041,6 +3041,7 @@ MipsTargetLowering::getSingleConstraintMatchWeight(
     break;
   case 'I': // signed 16 bit immediate
   case 'J': // integer zero
+  case 'K': // unsigned 16 bit immediate
     if (isa<ConstantInt>(CallOperandVal))
       weight = CW_Constant;
     break;
@@ -3113,6 +3114,16 @@ void MipsTargetLowering::LowerAsmOperandForConstraint(SDValue Op,
       }
     }
     return;
+  case 'K': // unsigned 16 bit immediate
+    if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
+      EVT Type = Op.getValueType();
+      uint64_t Val = (uint64_t)C->getZExtValue();
+      if (isUInt<16>(Val)) {
+        Result = DAG.getTargetConstant(Val, Type);
+        break;
+      }
+    }
+    return;
   }
 
   if (Result.getNode()) {
diff --git a/test/CodeGen/Mips/inlineasm-cnstrnt-bad-K.ll b/test/CodeGen/Mips/inlineasm-cnstrnt-bad-K.ll
new file mode 100644
index 00000000000..3baf437324a
--- /dev/null
+++ b/test/CodeGen/Mips/inlineasm-cnstrnt-bad-K.ll
@@ -0,0 +1,16 @@
+;
+;This is a negative test. The constant value given for the constraint (K)
+;is greater than 16 bits (0x00100000).
+;
+; 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 'K'
+
+  tail call i32 asm "addu $0,$1,$2", "=r,r,K"(i32 1024, i32 1048576) nounwind
+  ret i32 0
+}
+
diff --git a/test/CodeGen/Mips/inlineasm_constraint.ll b/test/CodeGen/Mips/inlineasm_constraint.ll
index f053e0e2766..04bd513a682 100644
--- a/test/CodeGen/Mips/inlineasm_constraint.ll
+++ b/test/CodeGen/Mips/inlineasm_constraint.ll
@@ -21,6 +21,12 @@ entry:
 ; CHECK: #NO_APP
   tail call i32 asm sideeffect "addi $0,$1,$2\0A\09 ", "=r,r,J"(i32 7, i16 0) nounwind
 
+; Now K with 64
+; CHECK: #APP
+; CHECK: addu ${{[0-9]+}},${{[0-9]+}},64
+; CHECK: #NO_APP	
+  tail call i16 asm sideeffect "addu $0,$1,$2\0A\09 ", "=r,r,K"(i16 7, i16 64) nounwind
+
   ret i32 0
 }