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[DirectX] only allow intrinsics defined in DXIL.td #128613

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Merged
merged 4 commits into from
Feb 25, 2025
Merged

[DirectX] only allow intrinsics defined in DXIL.td #128613

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69f0295
[DirectX] only allow intrinsics defined in DXIL.td
farzonl Feb 25, 2025
3aacbd7
allow dx_resource_casthandle through and non intrinsic functions, fix…
farzonl Feb 25, 2025
f19dcf6
address pr comments
farzonl Feb 25, 2025
d40e8ff
Address PR comments, change diag string to indicate an intrinsic is n…
farzonl Feb 25, 2025
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14 changes: 13 additions & 1 deletion llvm/lib/Target/DirectX/DXILOpLowering.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -770,8 +770,20 @@ class OpLowerer {
continue;
Intrinsic::ID ID = F.getIntrinsicID();
switch (ID) {
default:
// NOTE: Skip dx_resource_casthandle here. They are
// resolved after this loop in cleanupHandleCasts.
case Intrinsic::dx_resource_casthandle:
// NOTE: llvm.dbg.value is supported as is in DXIL.
case Intrinsic::dbg_value:
case Intrinsic::not_intrinsic:
continue;
default: {
DiagnosticInfoUnsupported Diag(
F, "Unsupported intrinsic for DXIL lowering");
M.getContext().diagnose(Diag);
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Should we also set HasErrors here? It doesn't actually matter, since we won't leave the casthandles in an inconsistent state and we don't key anything else off of that, but it seems weird not to

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I'll add it for consistency. We don't seem to be able to do multiple Diagnostic errors per test case. Ie I can only invoke M.getContext().diagnose(...) once. So setting HasErrors seemed pointless.

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That's because you're using opt, which has the default error handler that just exits the program. If you want a test case with multiple errors you need to use llc (or clang, but that wouldn't be appropriate for this kind of test)

HasErrors |= true;
break;
}
#define DXIL_OP_INTRINSIC(OpCode, Intrin, ...) \
case Intrin: \
HasErrors |= replaceFunctionWithOp( \
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2 changes: 1 addition & 1 deletion llvm/test/CodeGen/DirectX/clamp.ll
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Expand Up @@ -286,7 +286,7 @@ declare <3 x half> @llvm.dx.nclamp.v3f16(<3 x half>, <3 x half>, <3 x half>)
declare <4 x float> @llvm.dx.nclamp.v4f32(<4 x float>, <4 x float>, <4 x float>)
declare <2 x double> @llvm.dx.nclamp.v2f64(<2 x double>, <2 x double>, <2 x double>)
declare <4 x i32> @llvm.dx.sclamp.v4i32(<4 x i32>, <4 x i32>, <4 x i32>)
declare <3 x i16> @llvm.dx.uclamp.v3i32(<3 x i16>, <3 x i32>, <3 x i16>)
declare <3 x i16> @llvm.dx.uclamp.v3i16(<3 x i16>, <3 x i16>, <3 x i16>)
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Why did this change?

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It's just to make the declaration match the function that is actually used.
I think this is an NFC. We could remove the declarations and the test would still be fine.
I don't see harm in including this change.

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@farzonl farzonl Feb 25, 2025 •
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Well one its a typo. but it broke when I changed to error by default.There was no uclamp.v3i32 usage only a declare. There was a uclamp.v3i16 usage but no declare.

If we had a use then after the DXILIntrinsicExpansion pass ran it would have done cleanup for the decalres aswell. As is though this intrinsic declaration lives on and triggered our error because there is n uclamp lowering to a dxil op.

declare <4 x i32> @llvm.dx.uclamp.v4i32(<4 x i32>, <4 x i32>, <4 x i32>)
declare <2 x i64> @llvm.dx.uclamp.v2i64(<2 x i64>, <2 x i64>, <2 x i64>)

2 changes: 1 addition & 1 deletion llvm/test/CodeGen/DirectX/discard.ll
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@@ -1,4 +1,4 @@
; RUN: opt -passes='function(scalarizer),module(dxil-op-lower,dxil-intrinsic-expansion)' -S -mtriple=dxil-pc-shadermodel6.3-pixel %s | FileCheck %s
; RUN: opt -passes='function(scalarizer),module(dxil-intrinsic-expansion,dxil-op-lower)' -S -mtriple=dxil-pc-shadermodel6.3-pixel %s | FileCheck %s

; CHECK-LABEL: define void @test_scalar
; CHECK: call void @dx.op.discard(i32 82, i1 %0)
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11 changes: 11 additions & 0 deletions llvm/test/CodeGen/DirectX/unsupported_intrinsic.ll
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@@ -0,0 +1,11 @@
; RUN: not opt -S -dxil-op-lower -mtriple=dxil-pc-shadermodel6.3-library %s 2>&1 | FileCheck %s

; CHECK: error: <unknown>:0:0: in function llvm.vector.reduce.and.v4i32 i32 (<4 x i32>): Unsupported intrinsic for DXIL lowering
define i32 @fn_and(<4 x i32> %0) local_unnamed_addr #0 {
%2 = tail call i32 @llvm.vector.reduce.and.v4i32(<4 x i32> %0)
ret i32 %2
}

declare i32 @llvm.vector.reduce.and.v4i32(<4 x i32>)

attributes #0 = { convergent norecurse nounwind "hlsl.export"}