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[PATCH v3 02/28] target/alpha: Remove use_exit_tb
From: |
Richard Henderson |
Subject: |
[PATCH v3 02/28] target/alpha: Remove use_exit_tb |
Date: |
Thu, 8 Jul 2021 09:40:24 -0700 |
We have not needed to end a TB for I/O since ba3e7926691
("icount: clean up cpu_can_io at the entry to the block").
We do not need to use exit_tb for singlestep, which only
means generate one insn per TB.
Which leaves only singlestep_enabled, which means raise a
debug trap after every TB, which does not use exit_tb,
which would leave the function mis-named.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
target/alpha/translate.c | 15 ++-------------
1 file changed, 2 insertions(+), 13 deletions(-)
diff --git a/target/alpha/translate.c b/target/alpha/translate.c
index f2922f5f8c..aaedf78116 100644
--- a/target/alpha/translate.c
+++ b/target/alpha/translate.c
@@ -450,19 +450,8 @@ static bool in_superpage(DisasContext *ctx, int64_t addr)
#endif
}
-static bool use_exit_tb(DisasContext *ctx)
-{
- return ((tb_cflags(ctx->base.tb) & CF_LAST_IO)
- || ctx->base.singlestep_enabled
- || singlestep);
-}
-
static bool use_goto_tb(DisasContext *ctx, uint64_t dest)
{
- /* Suppress goto_tb in the case of single-steping and IO. */
- if (unlikely(use_exit_tb(ctx))) {
- return false;
- }
#ifndef CONFIG_USER_ONLY
/* If the destination is in the superpage, the page perms can't change. */
if (in_superpage(ctx, dest)) {
@@ -1271,7 +1260,7 @@ static DisasJumpType gen_call_pal(DisasContext *ctx, int
palcode)
need the page permissions check. We'll see the existence of
the page when we create the TB, and we'll flush all TBs if
we change the PAL base register. */
- if (!use_exit_tb(ctx)) {
+ if (!ctx->base.singlestep_enabled) {
tcg_gen_goto_tb(0);
tcg_gen_movi_i64(cpu_pc, entry);
tcg_gen_exit_tb(ctx->base.tb, 0);
@@ -3095,7 +3084,7 @@ static void alpha_tr_tb_stop(DisasContextBase *dcbase,
CPUState *cpu)
tcg_gen_movi_i64(cpu_pc, ctx->base.pc_next);
/* FALLTHRU */
case DISAS_PC_UPDATED:
- if (!use_exit_tb(ctx)) {
+ if (!ctx->base.singlestep_enabled) {
tcg_gen_lookup_and_goto_ptr();
break;
}
--
2.25.1
- [PATCH v3 00/28] accel/tcg: Introduce translator_use_goto_tb, Richard Henderson, 2021/07/08
- [PATCH v3 01/28] accel/tcg: Introduce translator_use_goto_tb, Richard Henderson, 2021/07/08
- [PATCH v3 06/28] target/arm: Use translator_use_goto_tb for aarch64, Richard Henderson, 2021/07/08
- [PATCH v3 02/28] target/alpha: Remove use_exit_tb,
Richard Henderson <=
- [PATCH v3 04/28] target/alpha: Use translator_use_goto_tb, Richard Henderson, 2021/07/08
- [PATCH v3 05/28] target/arm: Use DISAS_TOO_MANY for ISB and SB, Richard Henderson, 2021/07/08
- [PATCH v3 13/28] target/m68k: Use translator_use_goto_tb, Richard Henderson, 2021/07/08
- [PATCH v3 07/28] target/arm: Use translator_use_goto_tb for aarch32, Richard Henderson, 2021/07/08
- [PATCH v3 03/28] target/alpha: Remove in_superpage, Richard Henderson, 2021/07/08
- [PATCH v3 12/28] target/i386: Use translator_use_goto_tb, Richard Henderson, 2021/07/08
- [PATCH v3 10/28] target/cris: Use translator_use_goto_tb, Richard Henderson, 2021/07/08
- [PATCH v3 09/28] target/avr: Mark some helpers noreturn, Richard Henderson, 2021/07/08
- [PATCH v3 08/28] target/avr: Use translator_use_goto_tb, Richard Henderson, 2021/07/08
- [PATCH v3 15/28] target/mips: Use translator_use_goto_tb, Richard Henderson, 2021/07/08