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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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10 changes: 5 additions & 5 deletions src/coreclr/src/jit/importer.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -5947,21 +5947,21 @@ int Compiler::impBoxPatternMatch(CORINFO_RESOLVED_TOKEN* pResolvedToken, const B
case CEE_UNBOX_ANY:
if ((nextCodeAddr + 1 + sizeof(mdToken)) <= codeEndp)
{
// See if the resolved tokens in box, isinst and unbox.any describe types that are equal.
CORINFO_RESOLVED_TOKEN isinstResolvedToken = {};
impResolveToken(codeAddr + 1, &isinstResolvedToken, CORINFO_TOKENKIND_Class);

CORINFO_RESOLVED_TOKEN unboxResolvedToken = {};
impResolveToken(nextCodeAddr + 1, &unboxResolvedToken, CORINFO_TOKENKIND_Class);

// See if the resolved tokens describe types that are equal.
const TypeCompareState compareBoxIsInst =
info.compCompHnd->compareTypesForEquality(isinstResolvedToken.hClass,
pResolvedToken->hClass);
CORINFO_RESOLVED_TOKEN unboxResolvedToken = {};
impResolveToken(nextCodeAddr + 1, &unboxResolvedToken, CORINFO_TOKENKIND_Class);

const TypeCompareState compareBoxUnbox =
info.compCompHnd->compareTypesForEquality(unboxResolvedToken.hClass,
pResolvedToken->hClass);

// If so, box/unbox.any is a nop.
// If so, box + isinst + unbox.any is a nop.
if (compareBoxIsInst == TypeCompareState::Must && compareBoxUnbox == TypeCompareState::Must)
{
JITDUMP("\n Importing BOX; ISINST, UNBOX.ANY as NOP\n");
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