https://github.com/inbelic updated
https://github.com/llvm/llvm-project/pull/111010
>From 70089645ec5cf62b491a56df96ec46f4328fbc11 Mon Sep 17 00:00:00 2001
From: Finn Plummer <canadienf...@gmail.com>
Date: Thu, 3 Oct 2024 11:43:51 -0700
Subject: [PATCH 1/3] [HLSL] Implement `WaveReadLaneAt` intrinsic
- create a clang built-in in Builtins.td
- add semantic checking in SemaHLSL.cpp
- link the WaveReadLaneAt api in hlsl_intrinsics.h
- add lowering to spirv backend op GroupNonUniformShuffle
with Scope = 2 (Group) in SPIRVInstructionSelector.cpp
- add tests for HLSL intrinsic lowering to spirv intrinsic in
WaveReadLaneAt.hlsl
- add tests for sema checks in WaveReadLaneAt-errors.hlsl
- add spir-v backend tests in WaveReadLaneAt.ll
---
clang/include/clang/Basic/Builtins.td | 6 +++
clang/lib/CodeGen/CGBuiltin.cpp | 16 ++++++++
clang/lib/CodeGen/CGHLSLRuntime.h | 1 +
clang/lib/Headers/hlsl/hlsl_intrinsics.h | 7 ++++
clang/lib/Sema/SemaHLSL.cpp | 20 ++++++++++
.../CodeGenHLSL/builtins/WaveReadLaneAt.hlsl | 40 +++++++++++++++++++
.../BuiltIns/WaveReadLaneAt-errors.hlsl | 21 ++++++++++
llvm/include/llvm/IR/IntrinsicsSPIRV.td | 1 +
.../Target/SPIRV/SPIRVInstructionSelector.cpp | 15 +++++++
.../SPIRV/hlsl-intrinsics/WaveReadLaneAt.ll | 28 +++++++++++++
10 files changed, 155 insertions(+)
create mode 100644 clang/test/CodeGenHLSL/builtins/WaveReadLaneAt.hlsl
create mode 100644 clang/test/SemaHLSL/BuiltIns/WaveReadLaneAt-errors.hlsl
create mode 100644 llvm/test/CodeGen/SPIRV/hlsl-intrinsics/WaveReadLaneAt.ll
diff --git a/clang/include/clang/Basic/Builtins.td
b/clang/include/clang/Basic/Builtins.td
index 8090119e512fbb..eec9acd4d27d7d 100644
--- a/clang/include/clang/Basic/Builtins.td
+++ b/clang/include/clang/Basic/Builtins.td
@@ -4703,6 +4703,12 @@ def HLSLWaveIsFirstLane : LangBuiltin<"HLSL_LANG"> {
let Prototype = "bool()";
}
+def HLSLWaveReadLaneAt : LangBuiltin<"HLSL_LANG"> {
+ let Spellings = ["__builtin_hlsl_wave_read_lane_at"];
+ let Attributes = [NoThrow, Const];
+ let Prototype = "void(...)";
+}
+
def HLSLClamp : LangBuiltin<"HLSL_LANG"> {
let Spellings = ["__builtin_hlsl_elementwise_clamp"];
let Attributes = [NoThrow, Const];
diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
index da3eca73bfb575..dff56af9282e9d 100644
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -18835,6 +18835,22 @@ case Builtin::BI__builtin_hlsl_elementwise_isinf: {
Intrinsic::ID ID = CGM.getHLSLRuntime().getWaveIsFirstLaneIntrinsic();
return EmitRuntimeCall(Intrinsic::getDeclaration(&CGM.getModule(), ID));
}
+ case Builtin::BI__builtin_hlsl_wave_read_lane_at: {
+ // Due to the use of variadic arguments we must explicitly retreive them
and
+ // create our function type.
+ Value *OpExpr = EmitScalarExpr(E->getArg(0));
+ Value *OpIndex = EmitScalarExpr(E->getArg(1));
+ llvm::FunctionType *FT = llvm::FunctionType::get(
+ OpExpr->getType(), ArrayRef{OpExpr->getType(), OpIndex->getType()},
+ false);
+
+ // Get overloaded name
+ std::string name =
+ Intrinsic::getName(CGM.getHLSLRuntime().getWaveReadLaneAtIntrinsic(),
+ ArrayRef{OpExpr->getType()}, &CGM.getModule());
+ return EmitRuntimeCall(CGM.CreateRuntimeFunction(FT, name, {}, false,
true),
+ ArrayRef{OpExpr, OpIndex},
"hlsl.wave.read.lane.at");
+ }
case Builtin::BI__builtin_hlsl_elementwise_sign: {
Value *Op0 = EmitScalarExpr(E->getArg(0));
llvm::Type *Xty = Op0->getType();
diff --git a/clang/lib/CodeGen/CGHLSLRuntime.h
b/clang/lib/CodeGen/CGHLSLRuntime.h
index a8aabca7348ffb..a639ce2d784f4a 100644
--- a/clang/lib/CodeGen/CGHLSLRuntime.h
+++ b/clang/lib/CodeGen/CGHLSLRuntime.h
@@ -87,6 +87,7 @@ class CGHLSLRuntime {
GENERATE_HLSL_INTRINSIC_FUNCTION(SDot, sdot)
GENERATE_HLSL_INTRINSIC_FUNCTION(UDot, udot)
GENERATE_HLSL_INTRINSIC_FUNCTION(WaveIsFirstLane, wave_is_first_lane)
+ GENERATE_HLSL_INTRINSIC_FUNCTION(WaveReadLaneAt, wave_read_lane_at)
//===----------------------------------------------------------------------===//
// End of reserved area for HLSL intrinsic getters.
diff --git a/clang/lib/Headers/hlsl/hlsl_intrinsics.h
b/clang/lib/Headers/hlsl/hlsl_intrinsics.h
index 810a16d75f0228..a7bdc353ae71bf 100644
--- a/clang/lib/Headers/hlsl/hlsl_intrinsics.h
+++ b/clang/lib/Headers/hlsl/hlsl_intrinsics.h
@@ -2015,6 +2015,13 @@ _HLSL_AVAILABILITY(shadermodel, 6.0)
_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_is_first_lane)
__attribute__((convergent)) bool WaveIsFirstLane();
+// \brief Returns the value of the expression for the given lane index within
+// the specified wave.
+template <typename T>
+_HLSL_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_read_lane_at)
+ __attribute__((convergent)) T WaveReadLaneAt(T, int32_t);
+
//===----------------------------------------------------------------------===//
// sign builtins
//===----------------------------------------------------------------------===//
diff --git a/clang/lib/Sema/SemaHLSL.cpp b/clang/lib/Sema/SemaHLSL.cpp
index 43cc6c81ae5cb0..d54da3fd8375ed 100644
--- a/clang/lib/Sema/SemaHLSL.cpp
+++ b/clang/lib/Sema/SemaHLSL.cpp
@@ -1956,6 +1956,26 @@ bool SemaHLSL::CheckBuiltinFunctionCall(unsigned
BuiltinID, CallExpr *TheCall) {
return true;
break;
}
+ case Builtin::BI__builtin_hlsl_wave_read_lane_at: {
+ if (SemaRef.checkArgCount(TheCall, 2))
+ return true;
+
+ // Ensure index parameter type can be interpreted as a uint
+ ExprResult Index = TheCall->getArg(1);
+ QualType ArgTyIndex = Index.get()->getType();
+ if (!ArgTyIndex->hasIntegerRepresentation()) {
+ SemaRef.Diag(TheCall->getArg(1)->getBeginLoc(),
+ diag::err_typecheck_convert_incompatible)
+ << ArgTyIndex << SemaRef.Context.UnsignedIntTy << 1 << 0 << 0;
+ return true;
+ }
+
+ // Ensure return type is the same as the input expr type
+ ExprResult Expr = TheCall->getArg(0);
+ QualType ArgTyExpr = Expr.get()->getType();
+ TheCall->setType(ArgTyExpr);
+ break;
+ }
case Builtin::BI__builtin_elementwise_acos:
case Builtin::BI__builtin_elementwise_asin:
case Builtin::BI__builtin_elementwise_atan:
diff --git a/clang/test/CodeGenHLSL/builtins/WaveReadLaneAt.hlsl
b/clang/test/CodeGenHLSL/builtins/WaveReadLaneAt.hlsl
new file mode 100644
index 00000000000000..62319ebc04e2db
--- /dev/null
+++ b/clang/test/CodeGenHLSL/builtins/WaveReadLaneAt.hlsl
@@ -0,0 +1,40 @@
+// RUN: %clang_cc1 -std=hlsl2021 -finclude-default-header -x hlsl -triple \
+// RUN: dxil-pc-shadermodel6.3-compute %s -emit-llvm -disable-llvm-passes -o
- | \
+// RUN: FileCheck %s --check-prefixes=CHECK,CHECK-DXIL
+// RUN: %clang_cc1 -std=hlsl2021 -finclude-default-header -x hlsl -triple \
+// RUN: spirv-pc-vulkan-compute %s -emit-llvm -disable-llvm-passes -o - | \
+// RUN: FileCheck %s --check-prefixes=CHECK,CHECK-SPIRV
+
+// Test basic lowering to runtime function call.
+
+// CHECK-LABEL: test_int
+int test_int(int expr, uint idx) {
+ // CHECK-SPIRV: %[[#entry_tok:]] = call token
@llvm.experimental.convergence.entry()
+
+ // CHECK-SPIRV: %[[RET:.*]] = call [[TY:.*]]
@llvm.spv.wave.read.lane.at.i32([[TY]] %[[#]], i32 %[[#]])
+ // CHECK-DXIL: %[[RET:.*]] = call [[TY:.*]]
@llvm.dx.wave.read.lane.at.i32([[TY]] %[[#]], i32 %[[#]])
+
+ // CHECK: ret [[TY]] %[[RET]]
+ return WaveReadLaneAt(expr, idx);
+}
+
+// CHECK-DXIL: declare [[TY]] @llvm.dx.wave.read.lane.at.i32([[TY]], i32)
#[[#attr:]]
+// CHECK-SPIRV: declare [[TY]] @llvm.spv.wave.read.lane.at.i32([[TY]], i32)
#[[#attr:]]
+
+// Test basic lowering to runtime function call with array and float value.
+
+// CHECK-LABEL: test_floatv4
+float4 test_floatv4(float4 expr, uint idx) {
+ // CHECK-SPIRV: %[[#entry_tok1:]] = call token
@llvm.experimental.convergence.entry()
+
+ // CHECK-SPIRV: %[[RET1:.*]] = call [[TY1:.*]]
@llvm.spv.wave.read.lane.at.v4f32([[TY1]] %[[#]], i32 %[[#]])
+ // CHECK-DXIL: %[[RET1:.*]] = call [[TY1:.*]]
@llvm.dx.wave.read.lane.at.v4f32([[TY1]] %[[#]], i32 %[[#]])
+
+ // CHECK: ret [[TY1]] %[[RET1]]
+ return WaveReadLaneAt(expr, idx);
+}
+
+// CHECK-DXIL: declare [[TY1]] @llvm.dx.wave.read.lane.at.v4f32([[TY1]], i32)
#[[#attr]]
+// CHECK-SPIRV: declare [[TY1]] @llvm.spv.wave.read.lane.at.v4f32([[TY1]],
i32) #[[#attr]]
+
+// CHECK: attributes #[[#attr]] = {{{.*}} convergent {{.*}}}
diff --git a/clang/test/SemaHLSL/BuiltIns/WaveReadLaneAt-errors.hlsl
b/clang/test/SemaHLSL/BuiltIns/WaveReadLaneAt-errors.hlsl
new file mode 100644
index 00000000000000..451f2d3a563287
--- /dev/null
+++ b/clang/test/SemaHLSL/BuiltIns/WaveReadLaneAt-errors.hlsl
@@ -0,0 +1,21 @@
+// RUN: %clang_cc1 -finclude-default-header -triple
dxil-pc-shadermodel6.6-library %s -fnative-half-type -emit-llvm-only
-disable-llvm-passes -verify -verify-ignore-unexpected
+
+bool test_too_few_arg() {
+ return __builtin_hlsl_wave_read_lane_at();
+ // expected-error@-1 {{too few arguments to function call, expected 2, have
0}}
+}
+
+float2 test_too_few_arg_1(float2 p0) {
+ return __builtin_hlsl_wave_read_lane_at(p0);
+ // expected-error@-1 {{too few arguments to function call, expected 2, have
1}}
+}
+
+float2 test_too_many_arg(float2 p0) {
+ return __builtin_hlsl_wave_read_lane_at(p0, p0, p0);
+ // expected-error@-1 {{too many arguments to function call, expected 2, have
3}}
+}
+
+float3 test_index_type_check(float3 p0, double idx) {
+ return __builtin_hlsl_wave_read_lane_at(p0, idx);
+ // expected-error@-1 {{passing 'double' to parameter of incompatible type
'unsigned int'}}
+}
diff --git a/llvm/include/llvm/IR/IntrinsicsSPIRV.td
b/llvm/include/llvm/IR/IntrinsicsSPIRV.td
index 7ff3d58690ba75..b6ea9ce9b1411e 100644
--- a/llvm/include/llvm/IR/IntrinsicsSPIRV.td
+++ b/llvm/include/llvm/IR/IntrinsicsSPIRV.td
@@ -82,5 +82,6 @@ let TargetPrefix = "spv" in {
[llvm_anyint_ty, LLVMScalarOrSameVectorWidth<0, LLVMVectorElementType<0>>],
[IntrNoMem, Commutative] >;
def int_spv_wave_is_first_lane : DefaultAttrsIntrinsic<[llvm_i1_ty], [],
[IntrConvergent]>;
+ def int_spv_wave_read_lane_at : DefaultAttrsIntrinsic<[llvm_any_ty],
[LLVMMatchType<0>, llvm_i32_ty], [IntrConvergent]>;
def int_spv_sign : DefaultAttrsIntrinsic<[LLVMScalarOrSameVectorWidth<0,
llvm_i32_ty>], [llvm_any_ty]>;
}
diff --git a/llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp
b/llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp
index 7a565249a342d1..a7279193764fa4 100644
--- a/llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp
+++ b/llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp
@@ -2653,6 +2653,21 @@ bool SPIRVInstructionSelector::selectIntrinsic(Register
ResVReg,
.addUse(GR.getSPIRVTypeID(ResType))
.addUse(GR.getOrCreateConstInt(3, I, IntTy, TII));
}
+ case Intrinsic::spv_wave_read_lane_at: {
+ assert(I.getNumOperands() == 4);
+ assert(I.getOperand(2).isReg());
+ assert(I.getOperand(3).isReg());
+
+ // Defines the execution scope currently 2 for group, see scope table
+ SPIRVType *IntTy = GR.getOrCreateSPIRVIntegerType(32, I, TII);
+ return BuildMI(BB, I, I.getDebugLoc(),
+ TII.get(SPIRV::OpGroupNonUniformShuffle))
+ .addDef(ResVReg)
+ .addUse(GR.getSPIRVTypeID(ResType))
+ .addUse(I.getOperand(2).getReg())
+ .addUse(I.getOperand(3).getReg())
+ .addUse(GR.getOrCreateConstInt(2, I, IntTy, TII));
+ }
case Intrinsic::spv_step:
return selectStep(ResVReg, ResType, I);
// Discard intrinsics which we do not expect to actually represent code after
diff --git a/llvm/test/CodeGen/SPIRV/hlsl-intrinsics/WaveReadLaneAt.ll
b/llvm/test/CodeGen/SPIRV/hlsl-intrinsics/WaveReadLaneAt.ll
new file mode 100644
index 00000000000000..e02a2907ee28a0
--- /dev/null
+++ b/llvm/test/CodeGen/SPIRV/hlsl-intrinsics/WaveReadLaneAt.ll
@@ -0,0 +1,28 @@
+; RUN: llc -verify-machineinstrs -O0 -mtriple=spirv32v1.3-vulkan-unknown %s -o
- | FileCheck %s
+; RUN: %if spirv-tools %{ llc -O0 -mtriple=spirv-vulkan-unknown %s -o -
-filetype=obj | spirv-val %}
+
+; Test lowering to spir-v backend
+
+; CHECK-DAG: %[[#uint:]] = OpTypeInt 32 0
+; CHECK-DAG: %[[#scope:]] = OpConstant %[[#uint]] 2
+; CHECK-DAG: %[[#f32:]] = OpTypeFloat 32
+; CHECK-DAG: %[[#expr:]] = OpFunctionParameter %[[#f32]]
+; CHECK-DAG: %[[#idx:]] = OpFunctionParameter %[[#uint]]
+
+define spir_func void @test_1(float %expr, i32 %idx) #0 {
+entry:
+ %0 = call token @llvm.experimental.convergence.entry()
+; CHECK: %[[#ret:]] = OpGroupNonUniformShuffle %[[#f32]] %[[#expr]]
%[[#idx]] %[[#scope]]
+ %1 = call float @llvm.spv.wave.read.lane.at(float %expr, i32 %idx) [
"convergencectrl"(token %0) ]
+ ret void
+}
+
+declare i32 @__hlsl_wave_get_lane_index() #1
+
+attributes #0 = { convergent norecurse "hlsl.numthreads"="1,1,1"
"hlsl.shader"="compute" "no-trapping-math"="true"
"stack-protector-buffer-size"="8" }
+attributes #1 = { convergent }
+
+!llvm.module.flags = !{!0, !1}
+
+!0 = !{i32 1, !"wchar_size", i32 4}
+!1 = !{i32 4, !"dx.disable_optimizations", i32 1}
>From e8c5dba828f25c2894980631ae019936a3d9e9f6 Mon Sep 17 00:00:00 2001
From: Finn Plummer <canadienf...@gmail.com>
Date: Thu, 3 Oct 2024 12:45:50 -0700
Subject: [PATCH 2/3] [DXIL] add WaveReadLaneAt intrinsic for scalars
- add WaveReadLaneAt intrinsic to IntrinsicsDirectX.td and mapping
to DXIL.td
- add test to show scalar functionality
- note that this doesn't include support for the scalarizer to
handle this function will be added in a future pr
---
llvm/include/llvm/IR/IntrinsicsDirectX.td | 1 +
llvm/lib/Target/DirectX/DXIL.td | 10 ++++
llvm/test/CodeGen/DirectX/WaveReadLaneAt.ll | 56 +++++++++++++++++++++
3 files changed, 67 insertions(+)
create mode 100644 llvm/test/CodeGen/DirectX/WaveReadLaneAt.ll
diff --git a/llvm/include/llvm/IR/IntrinsicsDirectX.td
b/llvm/include/llvm/IR/IntrinsicsDirectX.td
index 555877e7aaf0e5..a12526539e7efe 100644
--- a/llvm/include/llvm/IR/IntrinsicsDirectX.td
+++ b/llvm/include/llvm/IR/IntrinsicsDirectX.td
@@ -83,6 +83,7 @@ def int_dx_umad : DefaultAttrsIntrinsic<[llvm_anyint_ty],
[LLVMMatchType<0>, LLV
def int_dx_normalize : DefaultAttrsIntrinsic<[LLVMMatchType<0>],
[llvm_anyfloat_ty], [IntrNoMem]>;
def int_dx_rsqrt : DefaultAttrsIntrinsic<[llvm_anyfloat_ty],
[LLVMMatchType<0>], [IntrNoMem]>;
def int_dx_wave_is_first_lane : DefaultAttrsIntrinsic<[llvm_i1_ty], [],
[IntrConvergent]>;
+def int_dx_wave_read_lane_at : DefaultAttrsIntrinsic<[llvm_any_ty],
[LLVMMatchType<0>, llvm_i32_ty], [IntrConvergent]>;
def int_dx_sign : DefaultAttrsIntrinsic<[LLVMScalarOrSameVectorWidth<0,
llvm_i32_ty>], [llvm_any_ty], [IntrNoMem]>;
def int_dx_step : DefaultAttrsIntrinsic<[LLVMMatchType<0>], [llvm_anyfloat_ty,
LLVMMatchType<0>], [IntrNoMem]>;
}
diff --git a/llvm/lib/Target/DirectX/DXIL.td b/llvm/lib/Target/DirectX/DXIL.td
index 9aa0af3e3a6b17..7283d069988123 100644
--- a/llvm/lib/Target/DirectX/DXIL.td
+++ b/llvm/lib/Target/DirectX/DXIL.td
@@ -801,3 +801,13 @@ def WaveIsFirstLane : DXILOp<110, waveIsFirstLane> {
let stages = [Stages<DXIL1_0, [all_stages]>];
let attributes = [Attributes<DXIL1_0, [ReadNone]>];
}
+
+def WaveReadLaneAt: DXILOp<117, waveIsFirstLane> {
+ let Doc = "returns the value from the specified lane";
+ let LLVMIntrinsic = int_dx_wave_read_lane_at;
+ let arguments = [OverloadTy, Int32Ty];
+ let result = OverloadTy;
+ let overloads = [Overloads<DXIL1_0, [HalfTy, FloatTy, DoubleTy, Int1Ty,
Int16Ty, Int32Ty]>];
+ let stages = [Stages<DXIL1_0, [all_stages]>];
+ let attributes = [Attributes<DXIL1_0, [ReadNone]>];
+}
diff --git a/llvm/test/CodeGen/DirectX/WaveReadLaneAt.ll
b/llvm/test/CodeGen/DirectX/WaveReadLaneAt.ll
new file mode 100644
index 00000000000000..7f524923136349
--- /dev/null
+++ b/llvm/test/CodeGen/DirectX/WaveReadLaneAt.ll
@@ -0,0 +1,56 @@
+; RUN: opt -S -dxil-op-lower -mtriple=dxil-pc-shadermodel6.3-compute %s |
FileCheck %s
+
+; Test that for scalar values, WaveReadLaneAt maps down to the DirectX op
+
+define noundef half @wave_rla_half(half noundef %expr, i32 noundef %idx) #0 {
+entry:
+; CHECK: call half @dx.op.waveReadLaneAt.f16(i32 117, half %expr, i32 %idx)
+ %ret = call half @llvm.dx.wave.read.lane.at.f16(half %expr, i32 %idx)
+ ret half %ret
+}
+
+define noundef float @wave_rla_float(float noundef %expr, i32 noundef %idx) #0
{
+entry:
+; CHECK: call float @dx.op.waveReadLaneAt.f32(i32 117, float %expr, i32 %idx)
+ %ret = call float @llvm.dx.wave.read.lane.at(float %expr, i32 %idx)
+ ret float %ret
+}
+
+define noundef double @wave_rla_double(double noundef %expr, i32 noundef %idx)
#0 {
+entry:
+; CHECK: call double @dx.op.waveReadLaneAt.f64(i32 117, double %expr, i32 %idx)
+ %ret = call double @llvm.dx.wave.read.lane.at(double %expr, i32 %idx)
+ ret double %ret
+}
+
+define noundef i1 @wave_rla_i1(i1 noundef %expr, i32 noundef %idx) #0 {
+entry:
+; CHECK: call i1 @dx.op.waveReadLaneAt.i1(i32 117, i1 %expr, i32 %idx)
+ %ret = call i1 @llvm.dx.wave.read.lane.at.i1(i1 %expr, i32 %idx)
+ ret i1 %ret
+}
+
+define noundef i16 @wave_rla_i16(i16 noundef %expr, i32 noundef %idx) #0 {
+entry:
+; CHECK: call i16 @dx.op.waveReadLaneAt.i16(i32 117, i16 %expr, i32 %idx)
+ %ret = call i16 @llvm.dx.wave.read.lane.at.i16(i16 %expr, i32 %idx)
+ ret i16 %ret
+}
+
+define noundef i32 @wave_rla_i32(i32 noundef %expr, i32 noundef %idx) #0 {
+entry:
+; CHECK: call i32 @dx.op.waveReadLaneAt.i32(i32 117, i32 %expr, i32 %idx)
+ %ret = call i32 @llvm.dx.wave.read.lane.at.i32(i32 %expr, i32 %idx)
+ ret i32 %ret
+}
+
+declare half @llvm.dx.wave.read.lane.at.f16(half, i32) #1
+declare float @llvm.dx.wave.read.lane.at.f32(float, i32) #1
+declare double @llvm.dx.wave.read.lane.at.f64(double, i32) #1
+
+declare i1 @llvm.dx.wave.read.lane.at.i1(i1, i32) #1
+declare i16 @llvm.dx.wave.read.lane.at.i16(i16, i32) #1
+declare i32 @llvm.dx.wave.read.lane.at.i32(i32, i32) #1
+
+attributes #0 = { norecurse "hlsl.numthreads"="1,1,1" "hlsl.shader"="compute"
"no-trapping-math"="true" "stack-protector-buffer-size"="8" }
+attributes #1 = { nocallback nofree nosync nounwind willreturn }
>From 9d7aa1d67f6a91a9e84f434d9eca3d8ee7630ba0 Mon Sep 17 00:00:00 2001
From: Finn Plummer <canadienf...@gmail.com>
Date: Fri, 4 Oct 2024 08:05:38 -0700
Subject: [PATCH 3/3] review comments
- add check for "convergencectrl" token in hlsl -> spirv intrinsic
- correct the execution scope of the spirv instruction, add
description
- fix typo
sq
---
clang/test/CodeGenHLSL/builtins/WaveReadLaneAt.hlsl | 4 ++--
llvm/lib/Target/DirectX/DXIL.td | 2 +-
llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp | 5 +++--
llvm/test/CodeGen/SPIRV/hlsl-intrinsics/WaveReadLaneAt.ll | 2 +-
4 files changed, 7 insertions(+), 6 deletions(-)
diff --git a/clang/test/CodeGenHLSL/builtins/WaveReadLaneAt.hlsl
b/clang/test/CodeGenHLSL/builtins/WaveReadLaneAt.hlsl
index 62319ebc04e2db..2b970f01ddbada 100644
--- a/clang/test/CodeGenHLSL/builtins/WaveReadLaneAt.hlsl
+++ b/clang/test/CodeGenHLSL/builtins/WaveReadLaneAt.hlsl
@@ -25,9 +25,9 @@ int test_int(int expr, uint idx) {
// CHECK-LABEL: test_floatv4
float4 test_floatv4(float4 expr, uint idx) {
- // CHECK-SPIRV: %[[#entry_tok1:]] = call token
@llvm.experimental.convergence.entry()
+ // CHECK-SPIRV: %[[#entry_tok:]] = call token
@llvm.experimental.convergence.entry()
- // CHECK-SPIRV: %[[RET1:.*]] = call [[TY1:.*]]
@llvm.spv.wave.read.lane.at.v4f32([[TY1]] %[[#]], i32 %[[#]])
+ // CHECK-SPIRV: %[[RET1:.*]] = call [[TY1:.*]]
@llvm.spv.wave.read.lane.at.v4f32([[TY1]] %[[#]], i32 %[[#]]) [
"convergencectrl"(token %[[#entry_tok]]) ]
// CHECK-DXIL: %[[RET1:.*]] = call [[TY1:.*]]
@llvm.dx.wave.read.lane.at.v4f32([[TY1]] %[[#]], i32 %[[#]])
// CHECK: ret [[TY1]] %[[RET1]]
diff --git a/llvm/lib/Target/DirectX/DXIL.td b/llvm/lib/Target/DirectX/DXIL.td
index 7283d069988123..fbb9cd41bdcc1e 100644
--- a/llvm/lib/Target/DirectX/DXIL.td
+++ b/llvm/lib/Target/DirectX/DXIL.td
@@ -802,7 +802,7 @@ def WaveIsFirstLane : DXILOp<110, waveIsFirstLane> {
let attributes = [Attributes<DXIL1_0, [ReadNone]>];
}
-def WaveReadLaneAt: DXILOp<117, waveIsFirstLane> {
+def WaveReadLaneAt: DXILOp<117, waveReadLaneAt> {
let Doc = "returns the value from the specified lane";
let LLVMIntrinsic = int_dx_wave_read_lane_at;
let arguments = [OverloadTy, Int32Ty];
diff --git a/llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp
b/llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp
index a7279193764fa4..680965c22400d1 100644
--- a/llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp
+++ b/llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp
@@ -2658,7 +2658,8 @@ bool SPIRVInstructionSelector::selectIntrinsic(Register
ResVReg,
assert(I.getOperand(2).isReg());
assert(I.getOperand(3).isReg());
- // Defines the execution scope currently 2 for group, see scope table
+ // IntTy is used to define the execution scope, set to 3 to denote a
+ // cross-lane interaction equivalent to a SPIR-V subgroup.
SPIRVType *IntTy = GR.getOrCreateSPIRVIntegerType(32, I, TII);
return BuildMI(BB, I, I.getDebugLoc(),
TII.get(SPIRV::OpGroupNonUniformShuffle))
@@ -2666,7 +2667,7 @@ bool SPIRVInstructionSelector::selectIntrinsic(Register
ResVReg,
.addUse(GR.getSPIRVTypeID(ResType))
.addUse(I.getOperand(2).getReg())
.addUse(I.getOperand(3).getReg())
- .addUse(GR.getOrCreateConstInt(2, I, IntTy, TII));
+ .addUse(GR.getOrCreateConstInt(3, I, IntTy, TII));
}
case Intrinsic::spv_step:
return selectStep(ResVReg, ResType, I);
diff --git a/llvm/test/CodeGen/SPIRV/hlsl-intrinsics/WaveReadLaneAt.ll
b/llvm/test/CodeGen/SPIRV/hlsl-intrinsics/WaveReadLaneAt.ll
index e02a2907ee28a0..df6643c605d129 100644
--- a/llvm/test/CodeGen/SPIRV/hlsl-intrinsics/WaveReadLaneAt.ll
+++ b/llvm/test/CodeGen/SPIRV/hlsl-intrinsics/WaveReadLaneAt.ll
@@ -4,7 +4,7 @@
; Test lowering to spir-v backend
; CHECK-DAG: %[[#uint:]] = OpTypeInt 32 0
-; CHECK-DAG: %[[#scope:]] = OpConstant %[[#uint]] 2
+; CHECK-DAG: %[[#scope:]] = OpConstant %[[#uint]] 3
; CHECK-DAG: %[[#f32:]] = OpTypeFloat 32
; CHECK-DAG: %[[#expr:]] = OpFunctionParameter %[[#f32]]
; CHECK-DAG: %[[#idx:]] = OpFunctionParameter %[[#uint]]
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