78 lines
1.7 KiB
C
78 lines
1.7 KiB
C
#include "sljitLir.h"
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#include <stdio.h>
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#include <stdlib.h>
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typedef long (SLJIT_FUNC *func3_t)(long a, long b, long c);
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/*
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This example, we generate a function like this:
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long func(long a, long b, long c)
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{
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if ((a & 1) == 0)
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return c;
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return b;
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}
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*/
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static int branch(long a, long b, long c)
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{
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void *code;
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unsigned long len;
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func3_t func;
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struct sljit_jump *ret_c;
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struct sljit_jump *out;
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/* Create a SLJIT compiler */
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struct sljit_compiler *C = sljit_create_compiler(NULL, NULL);
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/* 3 arg, 1 temp reg, 3 save reg */
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sljit_emit_enter(C, 0, SLJIT_ARGS3(W, W, W, W), 1, 3, 0, 0, 0);
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/* R0 = a & 1, S0 is argument a */
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sljit_emit_op2(C, SLJIT_AND, SLJIT_R0, 0, SLJIT_S0, 0, SLJIT_IMM, 1);
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/* if R0 == 0 then jump to ret_c, where is ret_c? we assign it later */
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ret_c = sljit_emit_cmp(C, SLJIT_EQUAL, SLJIT_R0, 0, SLJIT_IMM, 0);
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/* R0 = b, S1 is argument b */
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sljit_emit_op1(C, SLJIT_MOV, SLJIT_RETURN_REG, 0, SLJIT_S1, 0);
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/* jump to out */
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out = sljit_emit_jump(C, SLJIT_JUMP);
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/* here is the 'ret_c' should jump, we emit a label and set it to ret_c */
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sljit_set_label(ret_c, sljit_emit_label(C));
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/* R0 = c, S2 is argument c */
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sljit_emit_op1(C, SLJIT_MOV, SLJIT_RETURN_REG, 0, SLJIT_S2, 0);
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/* here is the 'out' should jump */
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sljit_set_label(out, sljit_emit_label(C));
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/* end of function */
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sljit_emit_return(C, SLJIT_MOV, SLJIT_RETURN_REG, 0);
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/* Generate machine code */
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code = sljit_generate_code(C);
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len = sljit_get_generated_code_size(C);
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/* Execute code */
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func = (func3_t)code;
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printf("func return %ld\n", func(a, b, c));
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/* dump_code(code, len); */
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/* Clean up */
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sljit_free_compiler(C);
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sljit_free_code(code, NULL);
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return 0;
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}
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int main()
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{
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return branch(4, 5, 6);
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}
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