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| author | Peter Maydell | 2020-08-03 15:28:15 +0200 |
|---|---|---|
| committer | Peter Maydell | 2020-08-24 11:15:11 +0200 |
| commit | 8b4c9a50dc9531a729ae4b5941d287ad0422db48 (patch) | |
| tree | 41979a56ab5cd289b97744b1babe1b88cefe1399 | |
| parent | target/arm: Delete unused VFP_DREG macros (diff) | |
| download | qemu-8b4c9a50dc9531a729ae4b5941d287ad0422db48.tar.gz qemu-8b4c9a50dc9531a729ae4b5941d287ad0422db48.tar.xz qemu-8b4c9a50dc9531a729ae4b5941d287ad0422db48.zip | |
target/arm/translate.c: Delete/amend incorrect comments
In arm_tr_init_disas_context() we have a FIXME comment that suggests
"cpu_M0 can probably be the same as cpu_V0". This isn't in fact
possible: cpu_V0 is used as a temporary inside gen_iwmmxt_shift(),
and that function is called in various places where cpu_M0 contains a
live value (i.e. between gen_op_iwmmxt_movq_M0_wRn() and
gen_op_iwmmxt_movq_wRn_M0() calls). Remove the comment.
We also have a comment on the declarations of cpu_V0/V1/M0 which
claims they're "for efficiency". This isn't true with modern TCG, so
replace this comment with one which notes that they're only used with
the iwmmxt decode.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20200803132815.3861-1-peter.maydell@linaro.org
| -rw-r--r-- | target/arm/translate.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/target/arm/translate.c b/target/arm/translate.c index 4ffd8b1fbe..dd25adcf40 100644 --- a/target/arm/translate.c +++ b/target/arm/translate.c @@ -57,8 +57,9 @@ #define IS_USER(s) (s->user) #endif -/* We reuse the same 64-bit temporaries for efficiency. */ +/* These are TCG temporaries used only by the legacy iwMMXt decoder */ static TCGv_i64 cpu_V0, cpu_V1, cpu_M0; +/* These are TCG globals which alias CPUARMState fields */ static TCGv_i32 cpu_R[16]; TCGv_i32 cpu_CF, cpu_NF, cpu_VF, cpu_ZF; TCGv_i64 cpu_exclusive_addr; @@ -8566,7 +8567,6 @@ static void arm_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs) cpu_V0 = tcg_temp_new_i64(); cpu_V1 = tcg_temp_new_i64(); - /* FIXME: cpu_M0 can probably be the same as cpu_V0. */ cpu_M0 = tcg_temp_new_i64(); } |