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[PATCH] x86emul: drop dead conditional from decode
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 30 Jun 2026 15:29:43 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>
- Delivery-date: Tue, 30 Jun 2026 13:29:55 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
We know that opcode_table[0x0f] is 0, there's no need to check that. Up
until ab082ffa87d5 ("x86emul: generate and make use of a canonical opcode
representation") or maybe already c4e7a67e3a10 ("x86emul: drop
SrcInvalid") this may have been justified, but it no longer is.
This eliminates a Misra C:2012 rule 2.2 ("There shall be no dead code")
violation.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
--- a/xen/arch/x86/x86_emulate/decode.c
+++ b/xen/arch/x86/x86_emulate/decode.c
@@ -1082,7 +1082,7 @@ int x86emul_decode(struct x86_emulate_st
/* Opcode byte(s). */
d = opcode_table[b];
- if ( d == 0 && b == 0x0f )
+ if ( b == 0x0f )
{
/* Two-byte opcode. */
b = insn_fetch_type(uint8_t);
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