From: Mateja Marjanovic <address@hidden>
Subject: [PATCH 4/4] target/mips: Fix insert.<b|h|w> for MIPS big endian host
From: Mateja Marjanovic <address@hidden>
Inserting from GPR to an element in a MSA register when
executed on a MIPS big endian CPU, didn't pick the
right element, and was behaving like on little endian.
Signed-off-by: Mateja Marjanovic <address@hidden>
---
...
@@ -1511,9 +1518,11 @@ void helper_msa_insert_df(CPUMIPSState *env, uint32_t
df, uint32_t wd,
case DF_WORD:
pwd->w[n] = (int32_t)rs;
break;
+#ifdef TARGET_MIPS64
case DF_DOUBLE:
pwd->d[n] = (int64_t)rs;
break;
+#endif
default:
assert(0);
}
You are right that this case should be under ifdef the way you did.
In fact, this code should be impossible to reach, since there is a check
for MIPS32/64 in translate.c before invoking this helper, so technically
there is no bug. However, it is a latent bag, and also an instance of
"dead code" (for MIPS32). So, you are rightfully removing this case
for MIPS32.
May I just ask you to put this in a separate patch, since this has nothing
to do with endianess etc. (with the title, let's say:
"target/mips: Remove handling of nonexistent flavor of INSERT for MIPS32",
and the commit message
"INSERT.D is present in MIPS64 MSA only. [1] page <XXX>
[1] <insert here the latest MSA MIPS64 doc>"
)?