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Fix for PR6274: teach constant folding to evaluate __builtin_expect. 

llvm-svn: 96054
This commit is contained in:
Eli Friedman 2010-02-13 00:10:10 +00:00
parent 18c28f6cdc
commit d5c9399696
2 changed files with 6 additions and 2 deletions
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7
clang/lib/AST/ExprConstant.cpp
View File

@ -812,7 +812,7 @@ public:
return false;
}
bool VisitCallExpr(const CallExpr *E);
bool VisitCallExpr(CallExpr *E);
bool VisitBinaryOperator(const BinaryOperator *E);
bool VisitUnaryOperator(const UnaryOperator *E);
bool VisitConditionalOperator(const ConditionalOperator *E);
@ -967,7 +967,7 @@ static int EvaluateBuiltinClassifyType(const CallExpr *E) {
return -1;
}
bool IntExprEvaluator::VisitCallExpr(const CallExpr *E) {
bool IntExprEvaluator::VisitCallExpr(CallExpr *E) {
switch (E->isBuiltinCall(Info.Ctx)) {
default:
return Error(E->getLocStart(), diag::note_invalid_subexpr_in_ice, E);
@ -1022,6 +1022,9 @@ bool IntExprEvaluator::VisitCallExpr(const CallExpr *E) {
Operand = Info.Ctx.Target.getEHDataRegisterNumber(Operand);
return Success(Operand, E);
}
case Builtin::BI__builtin_expect:
return Visit(E->getArg(0));
}
}

1
clang/test/Sema/const-eval.c
View File

@ -75,3 +75,4 @@ EVAL_EXPR(35, constbool)
EVAL_EXPR(36, constbool)
EVAL_EXPR(37, (1,2.0) == 2.0)
EVAL_EXPR(38, __builtin_expect(1,1) == 1)