}
CFGBlock *CFGBuilder::VisitChooseExpr(ChooseExpr *C) {
+ // See if this is a known constant.
+ bool KnownTrue = false;
+ bool KnownFalse = false;
+ Expr::EvalResult Result;
+ if (C->getCond()->Evaluate(Result, *Context)
+ && Result.Val.isInt()) {
+ if (Result.Val.getInt().getBoolValue())
+ KnownTrue = true;
+ else
+ KnownFalse = true;
+ }
+
CFGBlock* ConfluenceBlock = Block ? Block : createBlock();
ConfluenceBlock->appendStmt(C);
if (!FinishBlock(ConfluenceBlock))
return 0;
Block = createBlock(false);
- Block->addSuccessor(LHSBlock);
- Block->addSuccessor(RHSBlock);
+ if (KnownFalse)
+ Block->addSuccessor(0);
+ else
+ Block->addSuccessor(LHSBlock);
+ if (KnownTrue)
+ Block->addSuccessor(0);
+ else
+ Block->addSuccessor(RHSBlock);
Block->setTerminator(C);
return addStmt(C->getCond());
}
int y16 = 4;
int y17 = 4;
int y18 = 4;
+ int y19 = 4;
+ int y20 = 4;
++x; // expected-warning{{never read}}
++y1;
++y16;
++y17;
++y18;
+ ++y19;
+ ++y20;
switch (j) {
case 1:
}
(void)y18;
break;
+ case 17:
+ __builtin_choose_expr(0, (void)x, ((void)y19, ({ return; })));
+ (void)x;
+ break;
+ case 19:
+ __builtin_choose_expr(1, ((void)y20, ({ return; })), (void)x);
+ (void)x;
+ break;
}
}