The space reserved for CF_COUNT_MASK was overly large.
Reduce to free up cflags bits and eliminate an extra test.
Signed-off-by: Richard Henderson <richard.hender...@linaro.org>
Reviewed-by: Alex Bennée <alex.ben...@linaro.org>
Reviewed-by: Peter Maydell <peter.mayd...@linaro.org>
Message-Id: <20210717221851.2124573-2-richard.hender...@linaro.org>
---
include/exec/exec-all.h | 4 +++-
accel/tcg/translate-all.c | 5 ++---
2 files changed, 5 insertions(+), 4 deletions(-)
diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h
index 754f4130c9..dfe82ed19c 100644
--- a/include/exec/exec-all.h
+++ b/include/exec/exec-all.h
@@ -492,7 +492,9 @@ struct TranslationBlock {
target_ulong cs_base; /* CS base for this block */
uint32_t flags; /* flags defining in which context the code was generated
*/
uint32_t cflags; /* compile flags */
-#define CF_COUNT_MASK 0x00007fff
+
+/* Note that TCG_MAX_INSNS is 512; we validate this match elsewhere. */
+#define CF_COUNT_MASK 0x000001ff
#define CF_LAST_IO 0x00008000 /* Last insn may be an IO access. */
#define CF_MEMI_ONLY 0x00010000 /* Only instrument memory ops */
#define CF_USE_ICOUNT 0x00020000
diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c
index 4df26de858..5cc01d693b 100644
--- a/accel/tcg/translate-all.c
+++ b/accel/tcg/translate-all.c
@@ -1428,11 +1428,10 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
max_insns = cflags & CF_COUNT_MASK;
if (max_insns == 0) {
- max_insns = CF_COUNT_MASK;
- }
- if (max_insns > TCG_MAX_INSNS) {
max_insns = TCG_MAX_INSNS;
}
+ QEMU_BUILD_BUG_ON(CF_COUNT_MASK + 1 != TCG_MAX_INSNS);
+
if (cpu->singlestep_enabled || singlestep) {
max_insns = 1;
}
--
2.25.1
