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GH-126599: Remove the `PyOptimizer` API by brandtbucher · Pull Request #129194 · python/cpython

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@brandtbucher

The first commit removes the PyOptimizer API, which also nicely removes the ability to toggle the JIT on or off at runtime. The second commit "specializes" JUMP_BACKWARD so that we don't constantly check whether the JIT is enabled on backedges.

This should be covered by the NEWS entry from GH-126853.

markshannon

tier1 op(_SPECIALIZE_JUMP_BACKWARD, (--)) {
#if ENABLE_SPECIALIZATION
if (this_instr->op.code == JUMP_BACKWARD) {
if (tstate->interp->jit) {

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if (tstate->interp->jit) {
this_instr->op.code = (tstate->interp->jit) ? JUMP_BACKWARD_JIT : JUMP_BACKWARD_NO_JIT;

markshannon

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Looks good.
_SPECIALIZE_JUMP_BACKWARD looks oddly asymmetric, though.

This was referenced

Jan 30, 2025

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@brandtbucher @markshannon