radiance · commit

Emit `RET` directly for leaf functions

e5645fc3055df9b82d64ca7d38c29907fb450df30b53ed699363b957c8583b38

Alexis Sellier committed 1 month ago 1 parent d84d2c73

lib/std/arch/rv64/emit.rad +6 -1

        let sr = frame.savedRegs[i];
        emitSd(e, sr.reg, super::SP, sr.offset);
    }
}

/// Emit a return: jump to epilogue.
/// Emit a return: jump to epilogue, or emit `ret` directly for leaf functions.
pub fn emitReturn(e: *mut Emitter, frame: *Frame) {
    if frame.totalSize == 0 {
        // Leaf function: no frame to tear down, emit ret directly.
        emit(e, encode::ret());
        return;
    }
    recordBranch(e, frame.epilogueBlock, BranchKind::Jump);
}

/// Emit function epilogue.
/// Restores callee-saved registers, `RA/FP`, deallocates frame, returns.

612	612		let sr = frame.savedRegs[i];
613	613		emitSd(e, sr.reg, super::SP, sr.offset);
614	614		}
615	615		}
616	616
617		-	/// Emit a return: jump to epilogue.
	617	+	/// Emit a return: jump to epilogue, or emit `ret` directly for leaf functions.
618	618		pub fn emitReturn(e: mut Emitter, frame: Frame) {
	619	+	if frame.totalSize == 0 {
	620	+	// Leaf function: no frame to tear down, emit ret directly.
	621	+	emit(e, encode::ret());
	622	+	return;
	623	+	}
619	624		recordBranch(e, frame.epilogueBlock, BranchKind::Jump);
620	625		}
621	626
622	627		/// Emit function epilogue.
623	628		/// Restores callee-saved registers, `RA/FP`, deallocates frame, returns.