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GH-118095: Convert DEOPT_IFs on likely side exits to EXIT_IFs #118106

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Merged
merged 1 commit into from
Apr 24, 2024

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markshannon
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@markshannon markshannon commented Apr 19, 2024

Stats show about a 10% increase in traces executed and uops executed, with a corresponding reduction in tier 1 instructions executed.

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CI failures are not new.

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@gvanrossum gvanrossum left a comment

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LG, but what about the benchmark claiming it's 1% slower?

@@ -689,7 +689,7 @@ translate_bytecode_to_trace(
if (expansion->nuops > 0) {
// Reserve space for nuops (+ _SET_IP + _EXIT_TRACE)
int nuops = expansion->nuops;
RESERVE(nuops);
RESERVE(nuops + 1); /* One extra for exit */
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I'm taking this is for gh-117434, right?

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It seems likely to be the same issue, but I haven't checked.

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LG, but what about the benchmark claiming it's 1% slower?

That's the tier 2 interpreter. The generated code for tier 1 is unchanged.

@markshannon markshannon merged commit 77cd042 into python:main Apr 24, 2024
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@markshannon markshannon deleted the convert-deopts-to-exits branch August 6, 2024 10:16
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2 participants