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In some cases, with very simple thunks, it is possible that the .seh_endprologue is not emitted. This causes issues in the assembler because the epilogue ends up starting before the prologue has ended.

Bug: #11377
Cherry-pick: llvm#158173

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@swift-ci please test

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bnbarham commented Oct 1, 2025

@swift-ci please test

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@swift-ci please test macos platform

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@swift-ci please test macos platform

@Steelskin
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@swift-ci please test macos platform

@Steelskin
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@swift-ci please test macos platform

@Steelskin
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@swift-ci please test macos platform

In some cases, with very simple thunks, it is possible that the
`.seh_endprologue` is not emitted. This causes issues in the assembler
because the epilogue ends up starting before the prologue has ended.

Bug: swiftlang#11377
@Steelskin Steelskin force-pushed the fabrice/cp-21-win-arm64-always-emit-seh-end-prologue branch from eb414ba to 8205bcf Compare October 3, 2025 18:25
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@swift-ci please test

@Steelskin
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@swift-ci please test macos platform

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@Steelskin
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@swift-ci please test macos platform

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