================
@@ -263,6 +264,72 @@ static void terminateBody(CIRGenBuilderTy &builder,
mlir::Region &r,
b->erase();
}
+mlir::LogicalResult CIRGenFunction::emitIfStmt(const IfStmt &s) {
+ mlir::LogicalResult res = mlir::success();
+ // The else branch of a consteval if statement is always the only branch
+ // that can be runtime evaluated.
+ const Stmt *ConstevalExecuted;
+ if (s.isConsteval()) {
+ ConstevalExecuted = s.isNegatedConsteval() ? s.getThen() : s.getElse();
+ if (!ConstevalExecuted) {
+ // No runtime code execution required
+ return res;
+ }
+ }
+
+ // C99 6.8.4.1: The first substatement is executed if the expression
+ // compares unequal to 0. The condition must be a scalar type.
+ auto ifStmtBuilder = [&]() -> mlir::LogicalResult {
+ if (s.isConsteval())
+ return emitStmt(ConstevalExecuted, /*useCurrentScope=*/true);
+
+ if (s.getInit())
+ if (emitStmt(s.getInit(), /*useCurrentScope=*/true).failed())
+ return mlir::failure();
+
+ if (s.getConditionVariable())
+ emitDecl(*s.getConditionVariable());
+
+ // During LLVM codegen, if the condition constant folds and can be elided,
----------------
Andres-Salamanca wrote:
// If the condition folds to a constant and this is an 'if constexpr',
// we simplify it early in CIRGen to avoid emitting the full 'if'.
is this better ?
https://github.com/llvm/llvm-project/pull/134333
_______________________________________________
cfe-commits mailing list
cfe-commits@lists.llvm.org
https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
