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target/m68k: Fix build Werror with gcc 8.0.1

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The Werror stems from the compiler finding a path through the second
switch via a missing default case in which src1 is uninitialized, and
not being able to prove that the missing default case is unreachable
due to the first switch.

Simplify the second switch to merge default with OS_LONG,
which returns directly. This removes the unreachable path.

Backports commit 5cbc61110738accb16ff8ed1f08a32906d02790f from qemu.
This commit is contained in:
Richard Henderson 2018-05-11 10:37:34 -04:00 committed by Lioncash
parent ca9b601d0d
commit 991683af73
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 3 additions and 2 deletions
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5
qemu/target/m68k/translate.c
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@ -2369,7 +2369,7 @@ DISAS_INSN(arith_im)
im = tcg_const_i32(tcg_ctx, read_im32(env, s));
break;
default:
abort();
g_assert_not_reached();
}
if (with_SR) {
@ -2389,7 +2389,8 @@ DISAS_INSN(arith_im)
}
src1 = gen_get_sr(s);
break;
case OS_LONG:
default:
/* OS_LONG; others already g_assert_not_reached. */
disas_undef(env, s, insn);
return;
}