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For PR1070:

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Remove useless bitcasts by commenting them out.

llvm-svn: 32804
This commit is contained in:
Reid Spencer 2007-01-01 01:20:16 +00:00
parent 7eeddcbe43
commit 9bd62917ea
1 changed files with 33 additions and 2 deletions
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35
tools/llvm-upgrade/UpgradeParser.y
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@ -38,6 +38,15 @@ static uint64_t unique = 1;
// definitions and calls.
static bool AddAttributes = false;
// This bool is used to communicate between the InstVal and Inst rules about
// whether or not a cast should be deleted. When the flag is set, InstVal has
// determined that the cast is a candidate. However, it can only be deleted if
// the value being casted is the same value name as the instruction. The Inst
// rule makes that comparison if the flag is set and comments out the
// instruction if they match.
static bool deleteUselessCastFlag = false;
static std::string* deleteUselessCastName = 0;
typedef std::vector<TypeInfo> TypeVector;
static TypeVector EnumeratedTypes;
typedef std::map<std::string,TypeInfo> TypeMap;
@ -1152,10 +1161,18 @@ JumpTable : JumpTable IntType ConstValueRef ',' LABEL ValueRef {
Inst
: OptAssign InstVal {
if (!$1->empty())
*$1 += " = ";
if (!$1->empty()) {
if (deleteUselessCastFlag && *deleteUselessCastName == *$1) {
*$1 += " = ";
$1->insert(0, "; "); // don't actually delete it, just comment it out
delete deleteUselessCastName;
} else {
*$1 += " = ";
}
}
*$1 += *$2;
delete $2;
deleteUselessCastFlag = false;
$$ = $1;
};
@ -1250,6 +1267,20 @@ InstVal : ArithmeticOps Types ValueRef ',' ValueRef {
} else {
*$$ += *$1 + " " + source + " to " + *DstTy.newTy;
}
// Check to see if this is a useless cast of a value to the same name
// and the same type. Such casts will probably cause redefinition errors
// when assembled and perform no code gen action so just remove them.
if (*$1 == "cast" || *$1 == "bitcast")
if ($2.type.isInteger() && $4.isInteger() &&
$2.type.getBitWidth() == $4.getBitWidth()) {
deleteUselessCastFlag = true; // Flag the "Inst" rule
deleteUselessCastName = new std::string(*$2.val); // save the name
size_t pos = deleteUselessCastName->find_first_of("%\"",0);
if (pos != std::string::npos) {
// remove the type portion before val
deleteUselessCastName->erase(0, pos);
}
}
delete $1; $2.destroy();
delete $3; $4.destroy();
}