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Revert "GH-128914: Remove conditional stack effects from bytecodes.c and the code generators (GH-128918)" (GH-129202)

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The commit introduced a ~2.5-3% regression in the free threading build.

This reverts commit ab61d3f430.
This commit is contained in:
Sam Gross 2025-01-23 04:26:25 -05:00 • committed by GitHub
parent d7d066c3ab
commit a10f99375e
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GPG key ID: B5690EEEBB952194
44 changed files with 1679 additions and 1460 deletions
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12
Tools/cases_generator/tier2_generator.py
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@ -39,7 +39,14 @@ def declare_variable(
required.remove(var.name)
type, null = type_and_null(var)
space = " " if type[-1].isalnum() else ""
out.emit(f"{type}{space}{var.name};\n")
if var.condition:
out.emit(f"{type}{space}{var.name} = {null};\n")
if uop.replicates:
# Replicas may not use all their conditional variables
# So avoid a compiler warning with a fake use
out.emit(f"(void){var.name};\n")
else:
out.emit(f"{type}{space}{var.name};\n")
def declare_variables(uop: Uop, out: CWriter) -> None:
@ -208,6 +215,9 @@ def generate_tier2(
for name, uop in analysis.uops.items():
if uop.properties.tier == 1:
continue
if uop.properties.oparg_and_1:
out.emit(f"/* {uop.name} is split on (oparg & 1) */\n\n")
continue
if uop.is_super():
continue
why_not_viable = uop.why_not_viable()