[AArch64][SVE] Share code across SVE prologue/epilogue implementations (NFCI) #162253
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sdesmalen-arm
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svkeerthy
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…s (NFCI) (#162253) This patch refactors the SVE prologue and epilogue to use a common code path for both the "Default" and "Split" SVE layouts. This also factors some code into common helpers, such as: - `partitionSVECS()` (which returns the MI ranges of the PPR/ZPR callee-saves) - `getSVEStackFrameSizes()` (which returns the sizes of the PPR/ZPR locals/callee-saves) Since most split-SVE layout code is now shared with the default path, there should be much less code that is only tested when split-SVE is enabled.
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This patch refactors the SVE prologue and epilogue to use a common code path for both the "Default" and "Split" SVE layouts.
This also factors some code into common helpers, such as:
partitionSVECS()(which returns the MI ranges of the PPR/ZPR callee-saves)getSVEStackFrameSizes()(which returns the sizes of the PPR/ZPR locals/callee-saves)Since most split-SVE layout code is now shared with the default path, there should be much less code that is only tested when split-SVE is enabled.
This patch was prepared in a number of small steps (that should build alone). I've kept these as commits in the PR, as it may help with review.