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accel/tcg: Reduce CF_COUNT_MASK to match TCG_MAX_INSNS

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The space reserved for CF_COUNT_MASK was overly large.
Reduce to free up cflags bits and eliminate an extra test.

Tested-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20210717221851.2124573-2-richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2021-07-17 15:18:39 -07:00
parent f3e182b100
commit 78ff82bb1b
2 changed files with 5 additions and 4 deletions
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5
accel/tcg/translate-all.c
View File

@ -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;
}

4
include/exec/exec-all.h
View File

@ -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