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Add JIT implementation for jtable

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* libguile/jit.c (compile_jtable): Implement.
This commit is contained in:
Andy Wingo 2020-07-30 13:25:39 +02:00
parent 439e93a5ed
commit 5342eb542f
1 changed files with 36 additions and 5 deletions
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41
libguile/jit.c
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@ -4343,11 +4343,42 @@ static void
compile_jtable (scm_jit_state *j, uint32_t idx, uint32_t len, compile_jtable (scm_jit_state *j, uint32_t idx, uint32_t len,
const uint32_t *offsets) const uint32_t *offsets)
{ {
// Not yet implemented. ASSERT (len > 0);
UNREACHABLE ();
//jit_reloc_t jmp; int32_t default_offset = offsets[len - 1];
//jmp = jit_jmp (j->jit); default_offset >>= 8; /* Sign-extending shift. */
//add_inter_instruction_patch (j, jmp, vcode); uint32_t *default_target = j->ip + default_offset;
#if SIZEOF_UINTPTR_T >= 8
emit_sp_ref_u64 (j, T0, idx);
#else
emit_sp_ref_u64 (j, T0, T1, idx);
jit_reloc_t high_word_nonzero = jit_bnei (j->jit, T1, 0);
add_inter_instruction_patch (j, high_word_nonzero, default_target);
#endif
jit_reloc_t out_of_range = jit_bgei_u (j->jit, T0, len);
add_inter_instruction_patch (j, out_of_range, default_target);
/* Now that we know that the u64 at IDX is in the table, load the
table address, look up the target, and branch. */
emit_lshi (j, T0, T0, log2_sizeof_uintptr_t);
jit_reloc_t table = emit_mov_addr (j, T1);
jit_ldxr (j->jit, T0, T1, T0);
jit_jmpr (j->jit, T0);
/* Here's the table itself. */
jit_begin_data (j->jit);
jit_align (j->jit, sizeof(intptr_t));
jit_patch_here (j->jit, table);
for (size_t i = 0; i + 1 < len; i++) {
int32_t offset = offsets[i];
offset >>= 8; /* Sign-extending shift. */
uint32_t *target = j->ip + offset;
jit_reloc_t addr = jit_emit_addr (j->jit);
add_inter_instruction_patch (j, addr, target);
}
jit_end_data (j->jit);
} }
static void static void
compile_jtable_slow (scm_jit_state *j, uint32_t idx, uint32_t len, compile_jtable_slow (scm_jit_state *j, uint32_t idx, uint32_t len,