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tcg: Introduce tcg_remove_ops_after

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Introduce a function to remove everything emitted
since a given point.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2021-06-04 14:26:45 -07:00
parent 42eb6dfcf1
commit a80cdd3183
2 changed files with 23 additions and 0 deletions
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10
include/tcg/tcg.h
View file

@ -1071,6 +1071,16 @@ void tcg_op_remove(TCGContext *s, TCGOp *op);
TCGOp *tcg_op_insert_before(TCGContext *s, TCGOp *op, TCGOpcode opc);
TCGOp *tcg_op_insert_after(TCGContext *s, TCGOp *op, TCGOpcode opc);
/**
* tcg_remove_ops_after:
* @op: target operation
*
* Discard any opcodes emitted since @op. Expected usage is to save
* a starting point with tcg_last_op(), speculatively emit opcodes,
* then decide whether or not to keep those opcodes after the fact.
*/
void tcg_remove_ops_after(TCGOp *op);
void tcg_optimize(TCGContext *s);
/* Allocate a new temporary and initialize it with a constant. */

13
tcg/tcg.c
View file

@ -2083,6 +2083,19 @@ void tcg_op_remove(TCGContext *s, TCGOp *op)
#endif
}
void tcg_remove_ops_after(TCGOp *op)
{
TCGContext *s = tcg_ctx;
while (true) {
TCGOp *last = tcg_last_op();
if (last == op) {
return;
}
tcg_op_remove(s, last);
}
}
static TCGOp *tcg_op_alloc(TCGOpcode opc)
{
TCGContext *s = tcg_ctx;