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target-xtensa: fetch 3rd opcode byte only when needed 

According to ISA, 3.5.4, third opcode byte should not be fetched for
2-byte instructions.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov 2012-01-14 13:29:29 +04:00
parent 692f737cc2
commit a044ec2a06
1 changed files with 2 additions and 1 deletions
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3
target-xtensa/translate.c
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@ -749,7 +749,7 @@ static void disas_xtensa_insn(DisasContext *dc)
uint8_t b0 = ldub_code(dc->pc);
uint8_t b1 = ldub_code(dc->pc + 1);
uint8_t b2 = ldub_code(dc->pc + 2);
uint8_t b2 = 0;
static const uint32_t B4CONST[] = {
0xffffffff, 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 16, 32, 64, 128, 256
@ -764,6 +764,7 @@ static void disas_xtensa_insn(DisasContext *dc)
HAS_OPTION(XTENSA_OPTION_CODE_DENSITY);
} else {
dc->next_pc = dc->pc + 3;
b2 = ldub_code(dc->pc + 2);
}
switch (OP0) {