diff --git a/Python/optimizer_analysis.c b/Python/optimizer_analysis.c
index fab6fef5ccda10..cffd4a18dd9996 100644
--- a/Python/optimizer_analysis.c
+++ b/Python/optimizer_analysis.c
@@ -461,7 +461,7 @@ const uint16_t op_without_decref_inputs[MAX_UOP_ID + 1] = {
[_BINARY_OP_SUBTRACT_FLOAT] = _BINARY_OP_SUBTRACT_FLOAT__NO_DECREF_INPUTS,
};
-/* 1 for success, 0 for not ready, cannot error at the moment. */
+/* 1 for success, 0 for not ready, clears all possible errors. */
static int
optimize_uops(
PyCodeObject *co,
@@ -471,6 +471,7 @@ optimize_uops(
_PyBloomFilter *dependencies
)
{
+ assert(!PyErr_Occurred());
JitOptContext context;
JitOptContext *ctx = &context;
@@ -483,7 +484,7 @@ optimize_uops(
_Py_uop_abstractcontext_init(ctx);
_Py_UOpsAbstractFrame *frame = _Py_uop_frame_new(ctx, co, curr_stacklen, NULL, 0);
if (frame == NULL) {
- return -1;
+ return 0;
}
ctx->curr_frame_depth++;
ctx->frame = frame;
@@ -557,7 +558,11 @@ optimize_uops(
OPT_ERROR_IN_OPCODE(opcode);
}
_Py_uop_abstractcontext_fini(ctx);
- return -1;
+
+ assert(PyErr_Occurred());
+ PyErr_Clear();
+
+ return 0;
}
@@ -704,10 +709,12 @@ _Py_uop_analyze_and_optimize(
_PyFrame_GetCode(frame), buffer,
length, curr_stacklen, dependencies);
- if (length <= 0) {
+ if (length == 0) {
return length;
}
+ assert(length > 0);
+
length = remove_unneeded_uops(buffer, length);
assert(length > 0);
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