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remove some code where CGBuiltin folds constants, and use tryEvaluate to 

do it instead.  We should still handle __builtin_nan etc, but don't yet.
This fixes incorrect evaluation of __builtin_constant_p, a FIXME.

llvm-svn: 57156
This commit is contained in:
Chris Lattner 2008-10-06 06:09:18 +00:00
parent e50e90142e
commit a1518b1dfe
1 changed files with 19 additions and 22 deletions
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41
clang/lib/CodeGen/CGBuiltin.cpp
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@ -14,6 +14,7 @@
#include "CodeGenFunction.h"
#include "CodeGenModule.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/AST/APValue.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/Decl.h"
#include "clang/AST/TargetBuiltins.h"
@ -39,6 +40,24 @@ RValue CodeGenFunction::EmitBuiltinExpr(unsigned BuiltinID, const CallExpr *E) {
switch (BuiltinID) {
default: break; // Handle intrinsics and libm functions below.
case Builtin::BI__builtin_huge_val:
case Builtin::BI__builtin_huge_valf:
case Builtin::BI__builtin_huge_vall:
case Builtin::BI__builtin_inf:
case Builtin::BI__builtin_inff:
case Builtin::BI__builtin_infl:
case Builtin::BI__builtin_classify_type:
case Builtin::BI__builtin_constant_p: {
APValue Result;
bool IsCst = E->tryEvaluate(Result, CGM.getContext());
assert(IsCst && "These must all be constants!");
if (Result.isInt())
return RValue::get(llvm::ConstantInt::get(Result.getInt()));
assert(Result.isFloat() && "Unsupported constant type");
return RValue::get(llvm::ConstantFP::get(Result.getFloat()));
}
case Builtin::BI__builtin___CFStringMakeConstantString: {
const Expr *Arg = E->getArg(0);
@ -87,18 +106,6 @@ RValue CodeGenFunction::EmitBuiltinExpr(unsigned BuiltinID, const CallExpr *E) {
return RValue::get(Builder.CreateCall2(CGM.getIntrinsic(Intrinsic::vacopy),
DstPtr, SrcPtr));
}
case Builtin::BI__builtin_classify_type: {
APSInt Result(32);
if (!E->isBuiltinClassifyType(Result))
assert(0 && "Expr not __builtin_classify_type!");
return RValue::get(ConstantInt::get(Result));
}
case Builtin::BI__builtin_constant_p: {
APSInt Result(32);
// FIXME: Analyze the parameter and check if it is a constant.
Result = 0;
return RValue::get(ConstantInt::get(Result));
}
case Builtin::BI__builtin_abs: {
Value *ArgValue = EmitScalarExpr(E->getArg(0));
@ -224,16 +231,6 @@ RValue CodeGenFunction::EmitBuiltinExpr(unsigned BuiltinID, const CallExpr *E) {
return RValue::get(Builder.CreateCall(F));
}
case Builtin::BI__builtin_huge_val:
case Builtin::BI__builtin_huge_valf:
case Builtin::BI__builtin_huge_vall:
case Builtin::BI__builtin_inf:
case Builtin::BI__builtin_inff:
case Builtin::BI__builtin_infl: {
const llvm::fltSemantics &Sem =
CGM.getContext().getFloatTypeSemantics(E->getType());
return RValue::get(ConstantFP::get(APFloat::getInf(Sem)));
}
case Builtin::BI__builtin_nan:
case Builtin::BI__builtin_nanf:
case Builtin::BI__builtin_nanl: {