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[DirectX] Disable all libcalls for DXIL in TargetLibraryInfo.cpp #138991

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Merged
merged 2 commits into from
May 12, 2025
Merged

[DirectX] Disable all libcalls for DXIL in TargetLibraryInfo.cpp #138991

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27d707d
Disable all libcalls for DXIL
Icohedron May 7, 2025
24a41c9
Add a comment describing why libcalls are disabled for DXIL
Icohedron May 12, 2025
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8 changes: 8 additions & 0 deletions llvm/lib/Analysis/TargetLibraryInfo.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -205,6 +205,14 @@ static void initializeLibCalls(TargetLibraryInfoImpl &TLI, const Triple &T,
return;
}

// DXIL does not support libcalls, and disabling them here prevents a number
// of passes from introducing libcalls into DXIL which would otherwise
// complicate lowering/legalization
if (T.isDXIL()) {
TLI.disableAllFunctions();
return;
}

// memset_pattern{4,8,16} is only available on iOS 3.0 and Mac OS X 10.5 and
// later. All versions of watchOS support it.
if (T.isMacOSX()) {
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