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Refactor isIntrinsic() to be quicker, and change classof() (and thus, isa<IntrinsicInst>()) to use it. This decreases the number of occurrences of the slow-path string matching performed by getIntrinsicID().

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llvm-svn: 170602
This commit is contained in:
Michael Ilseman 2012-12-19 23:17:20 +00:00
parent 1528218a6f
commit 66430c26a2
3 changed files with 3 additions and 7 deletions
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2
include/llvm/Function.h
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@ -147,7 +147,7 @@ public:
/// defined in llvm/Intrinsics.h.
///
unsigned getIntrinsicID() const LLVM_READONLY;
bool isIntrinsic() const { return getIntrinsicID() != 0; }
bool isIntrinsic() const { return getName().startswith("llvm."); }
/// getCallingConv()/setCallingConv(CC) - These method get and set the
/// calling convention of this function. The enum values for the known

2
include/llvm/IntrinsicInst.h
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@ -47,7 +47,7 @@ namespace llvm {
// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const CallInst *I) {
if (const Function *CF = I->getCalledFunction())
return CF->getIntrinsicID() != 0;
return CF->isIntrinsic();
return false;
}
static inline bool classof(const Value *V) {

6
lib/VMCore/Function.cpp
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@ -326,15 +326,11 @@ void Function::copyAttributesFrom(const GlobalValue *Src) {
///
unsigned Function::getIntrinsicID() const {
const ValueName *ValName = this->getValueName();
if (!ValName)
if (!ValName || !isIntrinsic())
return 0;
unsigned Len = ValName->getKeyLength();
const char *Name = ValName->getKeyData();
if (Len < 5 || Name[4] != '.' || Name[0] != 'l' || Name[1] != 'l'
|| Name[2] != 'v' || Name[3] != 'm')
return 0; // All intrinsics start with 'llvm.'
#define GET_FUNCTION_RECOGNIZER
#include "llvm/Intrinsics.gen"
#undef GET_FUNCTION_RECOGNIZER