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Optimize box + isinst + unbox.any as nop #1817

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Merged
merged 10 commits into from
Feb 4, 2020
Merged

Optimize box + isinst + unbox.any as nop #1817

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b85d02a
Optimize `box + isinst + unbox.any` as `nop`
EgorBo Jan 16, 2020
017eb8c
Formatting
EgorBo Jan 16, 2020
8eb9f80
Address feedback
EgorBo Jan 16, 2020
ffdc2e1
Add tests
EgorBo Jan 16, 2020
8c80114
Fix CI errors
EgorBo Jan 16, 2020
3cf7d5c
Address feedback
EgorBo Jan 17, 2020
6d586f4
Merge branch 'master' of github.com:dotnet/runtime into opt-pm-boxing
EgorBo Feb 1, 2020
9b6726f
Address feedback
EgorBo Feb 1, 2020
4e36642
Remove box_isinst_unbox-noinline.csproj
EgorBo Feb 1, 2020
8040f7d
Fix Formatting
EgorBo Feb 1, 2020
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24 changes: 23 additions & 1 deletion src/coreclr/src/jit/importer.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -5902,13 +5902,13 @@ int Compiler::impBoxPatternMatch(CORINFO_RESOLVED_TOKEN* pResolvedToken, const B
break;

case CEE_ISINST:
// box + isinst + br_true/false
if (codeAddr + 1 + sizeof(mdToken) + 1 <= codeEndp)
{
const BYTE* nextCodeAddr = codeAddr + 1 + sizeof(mdToken);

switch (nextCodeAddr[0])
{
// box + isinst + br_true/false
case CEE_BRTRUE:
case CEE_BRTRUE_S:
case CEE_BRFALSE:
Expand Down Expand Up @@ -5941,6 +5941,28 @@ int Compiler::impBoxPatternMatch(CORINFO_RESOLVED_TOKEN* pResolvedToken, const B
}
}
}
break;

// box + isinst + unbox.any
case CEE_UNBOX_ANY:
if ((nextCodeAddr + 5) <= codeEndp)
{
CORINFO_RESOLVED_TOKEN unboxResolvedToken = {};
impResolveToken(codeAddr + 1, &unboxResolvedToken, CORINFO_TOKENKIND_Class);

// See if the resolved tokens describe types that are equal.
const TypeCompareState compare =
info.compCompHnd->compareTypesForEquality(unboxResolvedToken.hClass,
pResolvedToken->hClass);

// If so, box/unbox.any is a nop.
if (compare == TypeCompareState::Must)
{
JITDUMP("\n Importing BOX; ISINST, UNBOX.ANY as NOP\n");
return 6 + sizeof(mdToken);
}
}
break;
}
}
break;
Expand Down