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40aafa5279
* libguile/lightning/: New directory, made by the following commands: git remote add lightning https://git.savannah.gnu.org/git/lightning.git git merge -s ours --no-commit --allow-unrelated-histories lightning/master git read-tree --prefix=libguile/lightning/ -u lightning/master In theory we will be able to update via: git merge -s subtree lightning/master
96 lines
2.1 KiB
C
96 lines
2.1 KiB
C
#include <stdio.h>
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#include <lightning.h>
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typedef int (*pifi)(int); /* Pointer to Int Function of Int */
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static jit_state_t *_jit;
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void stack_push(int reg, int *sp)
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{
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jit_stxi_i (*sp, JIT_FP, reg);
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*sp += sizeof (int);
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}
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void stack_pop(int reg, int *sp)
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{
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*sp -= sizeof (int);
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jit_ldxi_i (reg, JIT_FP, *sp);
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}
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jit_node_t *compile_rpn(char *expr)
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{
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jit_node_t *in, *fn;
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int stack_base, stack_ptr;
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fn = jit_note(NULL, 0);
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jit_prolog();
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in = jit_arg();
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stack_ptr = stack_base = jit_allocai (32 * sizeof (int));
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jit_getarg_i(JIT_R2, in);
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while (*expr) {
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char buf[32];
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int n;
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if (sscanf(expr, "%[0-9]%n", buf, &n)) {
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expr += n - 1;
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stack_push(JIT_R0, &stack_ptr);
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jit_movi(JIT_R0, atoi(buf));
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} else if (*expr == 'x') {
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stack_push(JIT_R0, &stack_ptr);
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jit_movr(JIT_R0, JIT_R2);
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} else if (*expr == '+') {
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stack_pop(JIT_R1, &stack_ptr);
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jit_addr(JIT_R0, JIT_R1, JIT_R0);
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} else if (*expr == '-') {
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stack_pop(JIT_R1, &stack_ptr);
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jit_subr(JIT_R0, JIT_R1, JIT_R0);
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} else if (*expr == '*') {
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stack_pop(JIT_R1, &stack_ptr);
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jit_mulr(JIT_R0, JIT_R1, JIT_R0);
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} else if (*expr == '/') {
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stack_pop(JIT_R1, &stack_ptr);
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jit_divr(JIT_R0, JIT_R1, JIT_R0);
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} else {
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fprintf(stderr, "cannot compile: %s\n", expr);
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abort();
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}
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++expr;
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}
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jit_retr(JIT_R0);
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jit_epilog();
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return fn;
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}
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int main(int argc, char *argv[])
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{
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jit_node_t *nc, *nf;
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pifi c2f, f2c;
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int i;
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init_jit(argv[0]);
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_jit = jit_new_state();
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nc = compile_rpn("32x9*5/+");
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nf = compile_rpn("x32-5*9/");
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(void)jit_emit();
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c2f = (pifi)jit_address(nc);
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f2c = (pifi)jit_address(nf);
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jit_clear_state();
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printf("\nC:");
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for (i = 0; i <= 100; i += 10) printf("%3d ", i);
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printf("\nF:");
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for (i = 0; i <= 100; i += 10) printf("%3d ", c2f(i));
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printf("\n");
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printf("\nF:");
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for (i = 32; i <= 212; i += 18) printf("%3d ", i);
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printf("\nC:");
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for (i = 32; i <= 212; i += 18) printf("%3d ", f2c(i));
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printf("\n");
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jit_destroy_state();
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finish_jit();
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return 0;
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}
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