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target/i386: cc_op is not dynamic in gen_jcc1 

Resetting cc_op to CC_OP_DYNAMIC should be done at control flow junctions,
which is not the case here.  This translation block is ending and the
only effect of calling set_cc_op() would be a discard of s->cc_srcT.
This discard is useless (it's a temporary, not a global) and in fact
prevents gen_prepare_cc from returning s->cc_srcT.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2024-04-10 12:29:52 +02:00
parent e995f3f944
commit 64ddadc6bb
1 changed files with 2 additions and 2 deletions
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4
target/i386/tcg/translate.c
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@ -1227,13 +1227,13 @@ static inline void gen_jcc1_noeob(DisasContext *s, int b, TCGLabel *l1)
/* Generate a conditional jump to label 'l1' according to jump opcode
value 'b'. In the fast case, T0 is guaranteed not to be used.
A translation block must end soon. */
One or both of the branches will call gen_jmp_rel, so ensure
cc_op is clean. */
static inline void gen_jcc1(DisasContext *s, int b, TCGLabel *l1)
{
CCPrepare cc = gen_prepare_cc(s, b, s->T0);
gen_update_cc_op(s);
set_cc_op(s, CC_OP_DYNAMIC);
if (cc.use_reg2) {
tcg_gen_brcond_tl(cc.cond, cc.reg, cc.reg2, l1);
} else {