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author | Twinaphex | 2020-02-08 16:24:22 +0100 |
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committer | GitHub | 2020-02-08 16:24:22 +0100 |
commit | 0adc619b5a5705d16cc6caea64951776ababbb96 (patch) | |
tree | fbae9b1d18d04d8e7908aa1c3446782ebf6e8785 /deps/lightning/doc/rfib.c | |
parent | 0204c39a68a1fd4bf667aa8ece5a769f2983b7d0 (diff) | |
parent | 6f1edc3c7fd1f7f58155107d0c99d0ac7d22443b (diff) | |
download | pcsx_rearmed-0adc619b5a5705d16cc6caea64951776ababbb96.tar.gz pcsx_rearmed-0adc619b5a5705d16cc6caea64951776ababbb96.tar.bz2 pcsx_rearmed-0adc619b5a5705d16cc6caea64951776ababbb96.zip |
Merge pull request #377 from pcercuei/libretro
Lightrec dynarec
Diffstat (limited to 'deps/lightning/doc/rfib.c')
-rw-r--r-- | deps/lightning/doc/rfib.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/deps/lightning/doc/rfib.c b/deps/lightning/doc/rfib.c new file mode 100644 index 0000000..f14da42 --- /dev/null +++ b/deps/lightning/doc/rfib.c @@ -0,0 +1,53 @@ +#include <stdio.h> +#include <lightning.h> + +static jit_state_t *_jit; + +typedef int (*pifi)(int); /* Pointer to Int Function of Int */ + +int main(int argc, char *argv[]) +{ + pifi fib; + jit_node_t *label; + jit_node_t *call; + jit_node_t *in; /* offset of the argument */ + jit_node_t *ref; /* to patch the forward reference */ + jit_node_t *zero; /* to patch the forward reference */ + + init_jit(argv[0]); + _jit = jit_new_state(); + + label = jit_label(); + jit_prolog (); + in = jit_arg (); + jit_getarg (JIT_R0, in); /* R0 = n */ + zero = jit_beqi (JIT_R0, 0); + jit_movr (JIT_V0, JIT_R0); /* V0 = R0 */ + jit_movi (JIT_R0, 1); + ref = jit_blei (JIT_V0, 2); + jit_subi (JIT_V1, JIT_V0, 1); /* V1 = n-1 */ + jit_subi (JIT_V2, JIT_V0, 2); /* V2 = n-2 */ + jit_prepare(); + jit_pushargr(JIT_V1); + call = jit_finishi(NULL); + jit_patch_at(call, label); + jit_retval(JIT_V1); /* V1 = fib(n-1) */ + jit_prepare(); + jit_pushargr(JIT_V2); + call = jit_finishi(NULL); + jit_patch_at(call, label); + jit_retval(JIT_R0); /* R0 = fib(n-2) */ + jit_addr(JIT_R0, JIT_R0, JIT_V1); /* R0 = R0 + V1 */ + + jit_patch(ref); /* patch jump */ + jit_patch(zero); /* patch jump */ + jit_retr(JIT_R0); + + /* call the generated code, passing 32 as an argument */ + fib = jit_emit(); + jit_clear_state(); + printf("fib(%d) = %d\n", 32, fib(32)); + jit_destroy_state(); + finish_jit(); + return 0; +} |