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33bc19d30e
git-archimport-id: bonzini@gnu.org--2004b/lightning--stable--1.2--patch-15 git-archimport-id: bonzini@gnu.org--2004b/lightning--stable--1.2--patch-16
79 lines
2.7 KiB
C
79 lines
2.7 KiB
C
/******************************** -*- C -*- ****************************
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*
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* Sample example of branches
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*
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***********************************************************************/
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/***********************************************************************
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*
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* Copyright 2000 Free Software Foundation, Inc.
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* Written by Paolo Bonzini.
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*
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* This file is part of GNU lightning.
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*
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* GNU lightning is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1, or (at your option)
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* any later version.
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*
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* GNU lightning is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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* License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with GNU lightning; see the file COPYING.LESSER; if not, write to the
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* Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*
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***********************************************************************/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdio.h>
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#include "lightning.h"
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static jit_insn codeBuffer[1024];
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typedef int (*pifi)(int); /* Pointer to Int Function of Int */
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int main()
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{
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pifi nfibs = (pifi) (jit_set_ip(codeBuffer).iptr);
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int in; /* offset of the argument */
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jit_insn *ref; /* to patch the forward reference */
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jit_insn *loop; /* start of the loop */
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jit_prolog (1);
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in = jit_arg_ui ();
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jit_getarg_ui(JIT_R2, in); /* V0 = n */
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jit_movi_ui (JIT_R1, 1);
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ref = jit_blti_ui (jit_forward(), JIT_R2, 2);
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jit_subi_ui (JIT_R2, JIT_R2, 1);
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jit_movi_ui (JIT_R0, 1);
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loop= jit_get_label();
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jit_subi_ui (JIT_R2, JIT_R2, 1); /* we'll calculate one more */
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jit_addr_ui (JIT_V0, JIT_R0, JIT_R1); /* V0 = R0 + R1 */
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jit_movr_ui (JIT_R0, JIT_R1); /* R0 = R1 */
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jit_addi_ui (JIT_R1, JIT_V0, 1); /* R1 = V0 + 1 */
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jit_bnei_ui (loop, JIT_R2, 0); /* if (R2) goto loop; */
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jit_patch(ref); /* patch forward jump */
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jit_movr_ui (JIT_RET, JIT_R1); /* RET = R1 */
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jit_ret();
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jit_flush_code(codeBuffer, jit_get_ip().ptr);
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#ifdef LIGHTNING_DISASSEMBLE
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disassemble(stderr, (char *) codeBuffer, jit_get_ip().ptr);
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#endif
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#ifndef LIGHTNING_CROSS
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/* call the generated code, passing 36 as an argument */
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printf("nfibs(%d) = %d\n", 36, nfibs(36));
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#endif
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return 0;
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}
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