From: Richard Henderson <richard.henderson@linaro.org>
To: qemu-devel@nongnu.org
Subject: [PATCH 02/26] target/alpha: Remove use_exit_tb
Date: Sun, 20 Jun 2021 18:34:15 -0700 [thread overview]
Message-ID: <20210621013439.1791385-3-richard.henderson@linaro.org> (raw)
In-Reply-To: <20210621013439.1791385-1-richard.henderson@linaro.org>
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.
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 f454adea5e..70ba4a67c7 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);
@@ -3020,7 +3009,7 @@ 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
next prev parent reply other threads:[~2021-06-21 1:38 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-21 1:34 [PATCH 00/26] accel/tcg: Introduce translator_use_goto_tb Richard Henderson
2021-06-21 1:34 ` [PATCH 01/26] " Richard Henderson
2021-06-21 6:24 ` Max Filippov
2021-06-21 12:50 ` Philippe Mathieu-Daudé
2021-06-21 13:47 ` Richard Henderson
2021-06-21 15:03 ` Philippe Mathieu-Daudé
2021-06-21 13:45 ` Luis Fernando Fujita Pires
2021-06-21 1:34 ` Richard Henderson [this message]
2021-06-21 1:34 ` [PATCH 03/26] target/alpha: Remove in_superpage Richard Henderson
2021-06-21 1:34 ` [PATCH 04/26] target/alpha: Use translator_use_goto_tb Richard Henderson
2021-06-21 1:34 ` [PATCH 05/26] target/arm: " Richard Henderson
2021-06-21 10:20 ` Peter Maydell
2021-06-21 1:34 ` [PATCH 06/26] target/avr: " Richard Henderson
2021-06-21 1:34 ` [PATCH 07/26] target/avr: Mark some helpers noreturn Richard Henderson
2021-06-21 5:39 ` Michael Rolnik
2021-06-21 12:31 ` Philippe Mathieu-Daudé
2021-06-21 1:34 ` [PATCH 08/26] target/cris: Use translator_use_goto_tb Richard Henderson
2021-06-21 1:34 ` [PATCH 09/26] target/hppa: " Richard Henderson
2021-06-21 1:34 ` [PATCH 10/26] target/i386: " Richard Henderson
2021-06-21 1:34 ` [PATCH 11/26] target/m68k: " Richard Henderson
2021-06-21 7:35 ` Laurent Vivier
2021-06-21 1:34 ` [PATCH 12/26] target/microblaze: " Richard Henderson
2021-06-21 1:34 ` [PATCH 13/26] target/mips: " Richard Henderson
2021-06-21 1:34 ` [PATCH 14/26] target/mips: Fix missing else in gen_goto_tb Richard Henderson
2021-06-21 12:25 ` Philippe Mathieu-Daudé
2021-06-21 1:34 ` [PATCH 15/26] target/nios2: Use translator_use_goto_tb Richard Henderson
2021-06-21 1:34 ` [PATCH 16/26] target/openrisc: " Richard Henderson
2021-06-21 1:34 ` [PATCH 17/26] target/ppc: " Richard Henderson
2021-06-21 13:45 ` Luis Fernando Fujita Pires
2021-06-21 1:34 ` [PATCH 18/26] target/riscv: " Richard Henderson
2021-06-21 22:22 ` Alistair Francis
2021-06-21 1:34 ` [PATCH 19/26] target/rx: " Richard Henderson
2021-06-21 1:34 ` [PATCH 20/26] target/s390x: " Richard Henderson
2021-06-21 1:34 ` [PATCH 21/26] target/s390x: Remove use_exit_tb Richard Henderson
2021-06-21 1:34 ` [PATCH 22/26] target/sh4: Use translator_use_goto_tb Richard Henderson
2021-06-21 1:34 ` [PATCH 23/26] target/sparc: " Richard Henderson
2021-06-21 9:09 ` Mark Cave-Ayland
2021-06-21 1:34 ` [PATCH 24/26] target/tricore: " Richard Henderson
2021-06-21 14:27 ` Bastian Koppelmann
2021-06-21 1:34 ` [PATCH 25/26] target/tricore: Use tcg_gen_lookup_and_goto_ptr Richard Henderson
2021-06-21 14:32 ` Bastian Koppelmann
2021-06-21 1:34 ` [PATCH 26/26] target/xtensa: Use translator_use_goto_tb Richard Henderson
2021-06-21 6:24 ` Max Filippov
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