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Create RCIdentityAnalysis a cache for stripRCIdentityPreservingOps.

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The cache is needed to ensure we do not run into compile time problems once we
start looking through Phi Nodes.

The analysis is currently disabled and just returns
SILValue::stripRCIdentityPreservingOps. I am going to thread it through the rest
of the passes that use that call. Then I am going to hide
stripRCIdentityPreservingArgs. Finally post OzU, I am going to enable the pass.

rdar://18300069

Swift SVN r21891
This commit is contained in:
Michael Gottesman
2014-09-11 21:51:29 +00:00
parent 8ec2b299f3
commit 4647eb9601
7 changed files with 303 additions and 1 deletions
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lib/SIL/SILValue.cpp
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@@ -41,7 +41,6 @@ static bool isRCIdentityPreservingCast(ValueKind Kind) {
}
}
/// Return the underlying SILValue after stripping off identity SILArguments if
/// we belong to a BB with one predecessor.
static SILValue stripSinglePredecessorArgs(SILValue V) {