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3b46c1ff10
Previously, when resolving Phi's type, we would insert the coercion instruction at the end of the block in which the instruction is. This causes 3 problems: - With RemoveDeadResumePointOperands, which looks at the live time of instructions based on where they are consumed, which is fooled by not following the coerced type. - By increasing the register pressure by keeping multiple value alive while only one is needed. - By potentially adding fallible instruction before it could be guarded by precoditions, thus potentially be the source of repeated bailouts. This patch changes `TypeAnalyzer::adjustPhiInputs` to insert instructions at the end of the matching block preceeding the Phi instruction. Doing so should avoid all 3 issues previously seen. Differential Revision: https://phabricator.services.mozilla.com/D200281 |
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