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tcg: Reset free_temps before tcg_optimize

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When allocating new temps during tcg_optmize, do not re-use
any EBB temps that were used within the TB.  We do not have
any idea what span of the TB in which the temp was live.

Introduce tcg_temp_ebb_reset_freed and use before tcg_optimize,
as well as replacing the equivalent in plugin_gen_inject and
tcg_func_start.

Cc: qemu-stable@nongnu.org
Fixes: fb04ab7ddd ("tcg/optimize: Lower TCG_COND_TST{EQ,NE} if unsupported")
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2711
Reported-by: wannacu <wannacu2049@gmail.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
This commit is contained in:
Richard Henderson 2024-12-07 18:14:45 +00:00
parent a5ba0a7e4e
commit 04e006ab36
3 changed files with 11 additions and 2 deletions
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6
include/tcg/tcg-temp-internal.h
View file

@ -42,4 +42,10 @@ TCGv_i64 tcg_temp_ebb_new_i64(void);
TCGv_ptr tcg_temp_ebb_new_ptr(void);
TCGv_i128 tcg_temp_ebb_new_i128(void);
/* Forget all freed EBB temps, so that new allocations produce new temps. */
static inline void tcg_temp_ebb_reset_freed(TCGContext *s)
{
memset(s->free_temps, 0, sizeof(s->free_temps));
}
#endif /* TCG_TEMP_FREE_H */