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add a flag to output asm constraints so that we efficiently know 

if there is an input constraint that is tied to it.

llvm-svn: 70669
This commit is contained in:
Chris Lattner 2009-05-03 06:59:37 +00:00
parent 28b05c8249
commit 7d1644a151
1 changed files with 12 additions and 1 deletions
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13
clang/include/clang/Basic/TargetInfo.h
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@ -204,7 +204,8 @@ public:
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 @@ public:
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 @@ public:
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.