From: Paolo Bonzini <pbonzini@redhat.com>
To: Richard Henderson <richard.henderson@linaro.org>
Cc: qemu-devel <qemu-devel@nongnu.org>
Subject: Re: [PATCH 07/18] target/i386: introduce flags writeback mechanism
Date: Sun, 15 Oct 2023 16:51:26 +0200 [thread overview]
Message-ID: <CABgObfa7TgQZzQWFfp9t+M+0YxrgiPY5ZC2YZbzmcFvjN57iVQ@mail.gmail.com> (raw)
In-Reply-To: <47144c91-3c1d-430a-b917-fbe9bb7b193c@linaro.org>
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On Sat, Oct 14, 2023 at 6:06 PM Richard Henderson <
richard.henderson@linaro.org> wrote:
>
> On 10/14/23 03:01, Paolo Bonzini wrote:
> > +static void prepare_update1_cc(X86DecodedInsn *decode, DisasContext
*s, CCOp op)
> > +{
> > + decode->cc_dst = s->T0;
> > + set_cc_op(s, op);
> > +}
>
> You must delay the set_cc_op() until the end too, for the same reason.
The function call
> will emit discard opcodes, which will kill cc_foo while still live via
the memory exception.
Right, that can affect previous instructions due to dead code elimination.
I even wrote part of that code. :)
Since I have to add decode->cc_op, I'll add CC_OP_DYNAMIC handling as well,
and
assert that everything is NULL if the gen_* function didn't touch
decode->cc_op.
Thanks!
Paolo
>
>
> r~
>
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next prev parent reply other threads:[~2023-10-15 14:52 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-14 10:01 [PATCH 00/18] target/i386: decoder changes for 8.2 Paolo Bonzini
2023-10-14 10:01 ` [PATCH 01/18] target/i386: group common checks in the decoding phase Paolo Bonzini
2023-10-18 1:23 ` Richard Henderson
2023-10-14 10:01 ` [PATCH 02/18] target/i386: validate VEX.W for AVX instructions Paolo Bonzini
2023-10-18 1:24 ` Richard Henderson
2023-10-14 10:01 ` [PATCH 03/18] target/i386: implement SHA instructions Paolo Bonzini
2023-10-19 0:25 ` Richard Henderson
2023-10-14 10:01 ` [PATCH 04/18] tests/tcg/i386: initialize more registers in test-avx Paolo Bonzini
2023-10-18 1:30 ` Richard Henderson
2023-10-14 10:01 ` [PATCH 05/18] tests/tcg/i386: test-avx: add test cases for SHA new instructions Paolo Bonzini
2023-10-14 10:01 ` [PATCH 06/18] target/i386: accept full MemOp in gen_ext_tl Paolo Bonzini
2023-10-18 1:32 ` Richard Henderson
2023-10-14 10:01 ` [PATCH 07/18] target/i386: introduce flags writeback mechanism Paolo Bonzini
2023-10-14 16:06 ` Richard Henderson
2023-10-15 14:51 ` Paolo Bonzini [this message]
2023-10-14 10:01 ` [PATCH 08/18] target/i386: implement CMPccXADD Paolo Bonzini
2023-10-19 1:59 ` Richard Henderson
2023-10-14 10:01 ` [PATCH 09/18] target/i386: do not clobber A0 in POP translation Paolo Bonzini
2023-10-18 1:33 ` Richard Henderson
2023-10-14 10:01 ` [PATCH 10/18] target/i386: reintroduce debugging mechanism Paolo Bonzini
2023-10-14 10:01 ` [PATCH 11/18] target/i386: move 00-5F opcodes to new decoder Paolo Bonzini
2023-10-19 3:24 ` Richard Henderson
2023-10-14 10:01 ` [PATCH 12/18] target/i386: adjust decoding of J operand Paolo Bonzini
2023-10-19 3:25 ` Richard Henderson
2023-10-14 10:01 ` [PATCH 13/18] target/i386: split eflags computation out of gen_compute_eflags Paolo Bonzini
2023-10-19 3:35 ` Richard Henderson
2023-10-14 10:01 ` [PATCH 14/18] target/i386: move 60-BF opcodes to new decoder Paolo Bonzini
2023-10-19 4:51 ` Richard Henderson
2023-10-14 10:01 ` [PATCH 15/18] target/i386: move operand load and writeback out of gen_cmovcc1 Paolo Bonzini
2023-10-19 14:56 ` Richard Henderson
2023-10-14 10:01 ` [PATCH 16/18] target/i386: move remaining conditional operations to new decoder Paolo Bonzini
2023-10-19 15:05 ` Richard Henderson
2023-10-14 10:01 ` [PATCH 17/18] target/i386: remove now converted opcodes from old decoder Paolo Bonzini
2023-10-19 15:15 ` Richard Henderson
2023-10-14 10:01 ` [PATCH 18/18] target/i386: remove gen_op Paolo Bonzini
2023-10-18 1:36 ` Richard Henderson
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