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

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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.

Backports commit 5ca66278c859bb1ded243755aeead2be6992ce73 from qemu
This commit is contained in:
Emilio G. Cota 2018-03-05 11:40:03 -05:00 committed by Lioncash
parent 33d42df60c
commit 208014df9e
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 2 additions and 0 deletions
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2
qemu/target/arm/translate-a64.c
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@ -2395,6 +2395,8 @@ 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) {