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authorMichael Walle <michael@walle.cc>2011-03-07 23:01:04 +0100
committerEdgar E. Iglesias <edgar.iglesias@gmail.com>2011-03-31 08:54:05 +0200
commita5086f95421e43c7b9e1b28a111aae0be4848117 (patch)
tree086c0e1019960a732aa6d9559afe6c5b4dff59d9 /target-lm32/translate.c
parentfcda98630b121a63c9de0705df02e59f4dc2fecc (diff)
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lm32: use lookup table for opcodes
Instead of a for loop use a faster lookup table. Signed-off-by: Michael Walle <michael@walle.cc> Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Diffstat (limited to 'target-lm32/translate.c')
-rw-r--r--target-lm32/translate.c80
1 files changed, 18 insertions, 62 deletions
diff --git a/target-lm32/translate.c b/target-lm32/translate.c
index aa08a14..666d5f4 100644
--- a/target-lm32/translate.c
+++ b/target-lm32/translate.c
@@ -29,7 +29,6 @@
#include "disas.h"
#include "helper.h"
#include "tcg-op.h"
-#include "lm32-decode.h"
#include "qemu-common.h"
#include "hw/lm32_pic.h"
@@ -963,66 +962,28 @@ static void dec_xor(DisasContext *dc)
}
}
-typedef struct {
- struct {
- uint32_t bits;
- uint32_t mask;
- };
- void (*dec)(DisasContext *dc);
-} DecoderInfo;
+static void dec_ill(DisasContext *dc)
+{
+ cpu_abort(dc->env, "unknown opcode 0x%02x\n", dc->opcode);
+}
+typedef void (*DecoderInfo)(DisasContext *dc);
static const DecoderInfo decinfo[] = {
- {DEC_ADD, dec_add},
- {DEC_AND, dec_and},
- {DEC_ANDHI, dec_andhi},
- {DEC_B, dec_b},
- {DEC_BI, dec_bi},
- {DEC_BE, dec_be},
- {DEC_BG, dec_bg},
- {DEC_BGE, dec_bge},
- {DEC_BGEU, dec_bgeu},
- {DEC_BGU, dec_bgu},
- {DEC_BNE, dec_bne},
- {DEC_CALL, dec_call},
- {DEC_CALLI, dec_calli},
- {DEC_CMPE, dec_cmpe},
- {DEC_CMPG, dec_cmpg},
- {DEC_CMPGE, dec_cmpge},
- {DEC_CMPGEU, dec_cmpgeu},
- {DEC_CMPGU, dec_cmpgu},
- {DEC_CMPNE, dec_cmpne},
- {DEC_DIVU, dec_divu},
- {DEC_LB, dec_lb},
- {DEC_LBU, dec_lbu},
- {DEC_LH, dec_lh},
- {DEC_LHU, dec_lhu},
- {DEC_LW, dec_lw},
- {DEC_MODU, dec_modu},
- {DEC_MUL, dec_mul},
- {DEC_NOR, dec_nor},
- {DEC_OR, dec_or},
- {DEC_ORHI, dec_orhi},
- {DEC_SCALL, dec_scall},
- {DEC_RCSR, dec_rcsr},
- {DEC_SB, dec_sb},
- {DEC_SEXTB, dec_sextb},
- {DEC_SEXTH, dec_sexth},
- {DEC_SH, dec_sh},
- {DEC_SL, dec_sl},
- {DEC_SR, dec_sr},
- {DEC_SRU, dec_sru},
- {DEC_SUB, dec_sub},
- {DEC_SW, dec_sw},
- {DEC_USER, dec_user},
- {DEC_WCSR, dec_wcsr},
- {DEC_XNOR, dec_xnor},
- {DEC_XOR, dec_xor},
+ dec_sru, dec_nor, dec_mul, dec_sh, dec_lb, dec_sr, dec_xor, dec_lh,
+ dec_and, dec_xnor, dec_lw, dec_lhu, dec_sb, dec_add, dec_or, dec_sl,
+ dec_lbu, dec_be, dec_bg, dec_bge, dec_bgeu, dec_bgu, dec_sw, dec_bne,
+ dec_andhi, dec_cmpe, dec_cmpg, dec_cmpge, dec_cmpgeu, dec_cmpgu, dec_orhi,
+ dec_cmpne,
+ dec_sru, dec_nor, dec_mul, dec_divu, dec_rcsr, dec_sr, dec_xor, dec_ill,
+ dec_and, dec_xnor, dec_ill, dec_scall, dec_sextb, dec_add, dec_or, dec_sl,
+ dec_b, dec_modu, dec_sub, dec_user, dec_wcsr, dec_ill, dec_call, dec_sexth,
+ dec_bi, dec_cmpe, dec_cmpg, dec_cmpge, dec_cmpgeu, dec_cmpgu, dec_calli,
+ dec_cmpne
};
static inline void decode(DisasContext *dc)
{
uint32_t ir;
- int i;
if (unlikely(qemu_loglevel_mask(CPU_LOG_TB_OP))) {
tcg_gen_debug_insn_start(dc->pc);
@@ -1061,15 +1022,10 @@ static inline void decode(DisasContext *dc)
dc->format = OP_FMT_RI;
}
- /* Large switch for all insns. */
- for (i = 0; i < ARRAY_SIZE(decinfo); i++) {
- if ((dc->opcode & decinfo[i].mask) == decinfo[i].bits) {
- decinfo[i].dec(dc);
- return;
- }
- }
+ assert(ARRAY_SIZE(decinfo) == 64);
+ assert(dc->opcode < 64);
- cpu_abort(dc->env, "unknown opcode 0x%02x\n", dc->opcode);
+ decinfo[dc->opcode](dc);
}
static void check_breakpoint(CPUState *env, DisasContext *dc)