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tcg: Add TCGContext.emit_before_op

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Allow operations to be emitted via normal expanders
into the middle of the opcode stream.

Tested-by: Jørgen Hansen <Jorgen.Hansen@wdc.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2024-03-13 13:32:29 -10:00
parent 5888357942
commit 07843f75fd
2 changed files with 18 additions and 2 deletions
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6
include/tcg/tcg.h
View File

@ -553,6 +553,12 @@ struct TCGContext {
QTAILQ_HEAD(, TCGOp) ops, free_ops;
QSIMPLEQ_HEAD(, TCGLabel) labels;
/*
* When clear, new ops are added to the tail of @ops.
* When set, new ops are added in front of @emit_before_op.
*/
TCGOp *emit_before_op;
/* Tells which temporary holds a given register.
It does not take into account fixed registers */
TCGTemp *reg_to_temp[TCG_TARGET_NB_REGS];

14
tcg/tcg.c
View File

@ -1521,6 +1521,7 @@ void tcg_func_start(TCGContext *s)
QTAILQ_INIT(&s->ops);
QTAILQ_INIT(&s->free_ops);
s->emit_before_op = NULL;
QSIMPLEQ_INIT(&s->labels);
tcg_debug_assert(s->addr_type == TCG_TYPE_I32 ||
@ -2332,7 +2333,11 @@ static void tcg_gen_callN(TCGHelperInfo *info, TCGTemp *ret, TCGTemp **args)
op->args[pi++] = (uintptr_t)info;
tcg_debug_assert(pi == total_args);
QTAILQ_INSERT_TAIL(&tcg_ctx->ops, op, link);
if (tcg_ctx->emit_before_op) {
QTAILQ_INSERT_BEFORE(tcg_ctx->emit_before_op, op, link);
} else {
QTAILQ_INSERT_TAIL(&tcg_ctx->ops, op, link);
}
tcg_debug_assert(n_extend < ARRAY_SIZE(extend_free));
for (i = 0; i < n_extend; ++i) {
@ -3215,7 +3220,12 @@ static TCGOp *tcg_op_alloc(TCGOpcode opc, unsigned nargs)
TCGOp *tcg_emit_op(TCGOpcode opc, unsigned nargs)
{
TCGOp *op = tcg_op_alloc(opc, nargs);
QTAILQ_INSERT_TAIL(&tcg_ctx->ops, op, link);
if (tcg_ctx->emit_before_op) {
QTAILQ_INSERT_BEFORE(tcg_ctx->emit_before_op, op, link);
} else {
QTAILQ_INSERT_TAIL(&tcg_ctx->ops, op, link);
}
return op;
}