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arm/translate-a64: mark path as unreachable to eliminate warning 

Fixes the following warning when compiling with gcc 5.4.0 with -O1
optimizations and --enable-debug:

target/arm/translate-a64.c: In function ‘aarch64_tr_translate_insn’:
target/arm/translate-a64.c:2361:8: error: ‘post_index’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
     if (!post_index) {
        ^
target/arm/translate-a64.c:2307:10: note: ‘post_index’ was declared here
     bool post_index;
          ^
target/arm/translate-a64.c:2386:8: error: ‘writeback’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
     if (writeback) {
        ^
target/arm/translate-a64.c:2308:10: note: ‘writeback’ was declared here
     bool writeback;
          ^

Note that idx comes from selecting 2 bits, and therefore its value
can be at most 3.

Signed-off-by: Emilio G. Cota <cota@braap.org>
Acked-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 1510087611-1851-1-git-send-email-cota@braap.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Emilio G. Cota 2017-11-13 13:55:24 +00:00 committed by Peter Maydell
parent f291910db6
commit 5ca66278c8
1 changed files with 2 additions and 0 deletions
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2
target/arm/translate-a64.c
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@ -2351,6 +2351,8 @@ static void disas_ldst_reg_imm9(DisasContext *s, uint32_t insn,
post_index = false;
writeback = true;
break;
default:
g_assert_not_reached();
}
if (rn == 31) {