add a flag to output asm constraints so that we efficiently know
if there is an input constraint that is tied to it.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@70669 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/clang/Basic/TargetInfo.h b/include/clang/Basic/TargetInfo.h
index eda49ef..94fa0d4 100644
--- a/include/clang/Basic/TargetInfo.h
+++ b/include/clang/Basic/TargetInfo.h
@@ -204,7 +204,8 @@
CI_None = 0x00,
CI_AllowsMemory = 0x01,
CI_AllowsRegister = 0x02,
- CI_ReadWrite = 0x04 // "+r" output constraint (read and write).
+ CI_ReadWrite = 0x04, // "+r" output constraint (read and write).
+ CI_HasMatchingInput = 0x08 // This output operand has a matching input.
};
unsigned Flags;
int TiedOperand;
@@ -222,6 +223,14 @@
bool isReadWrite() const { return (Flags & CI_ReadWrite) != 0; }
bool allowsRegister() const { return (Flags & CI_AllowsRegister) != 0; }
bool allowsMemory() const { return (Flags & CI_AllowsMemory) != 0; }
+
+ /// hasMatchingInput - Return true if this output operand has a matching
+ /// (tied) input operand.
+ bool hasMatchingInput() const { return (Flags & CI_HasMatchingInput) != 0; }
+
+ /// hasTiedOperand() - Return true if this input operand is a matching
+ /// constraint that ties it to an output operand. If this returns true,
+ /// then getTiedOperand will indicate which output operand this is tied to.
bool hasTiedOperand() const { return TiedOperand != -1; }
unsigned getTiedOperand() const {
assert(hasTiedOperand() && "Has no tied operand!");
@@ -231,11 +240,13 @@
void setIsReadWrite() { Flags |= CI_ReadWrite; }
void setAllowsMemory() { Flags |= CI_AllowsMemory; }
void setAllowsRegister() { Flags |= CI_AllowsRegister; }
+ void setHasMatchingInput() { Flags |= CI_HasMatchingInput; }
/// setTiedOperand - Indicate that this is an input operand that is tied to
/// the specified output operand. Copy over the various constraint
/// information from the output.
void setTiedOperand(unsigned N, ConstraintInfo &Output) {
+ Output.setHasMatchingInput();
Flags = Output.Flags;
TiedOperand = N;
// Don't copy Name or constraint string.