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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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2
accel/tcg/plugin-gen.c
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@ -275,7 +275,7 @@ static void plugin_gen_inject(struct qemu_plugin_tb *plugin_tb)
* that might be live within the existing opcode stream.
* The simplest solution is to release them all and create new.
*/
memset(tcg_ctx->free_temps, 0, sizeof(tcg_ctx->free_temps));
tcg_temp_ebb_reset_freed(tcg_ctx);
QTAILQ_FOREACH_SAFE(op, &tcg_ctx->ops, link, next) {
switch (op->opc) {