mibintc updated this revision to Diff 348046. mibintc retitled this revision from "RFC [llvm][clang] Create new intrinsic llvm.arith.fence to control FP optimization at expression level" to "[llvm][clang] Create new intrinsic llvm.arith.fence to control FP optimization at expression level". mibintc edited the summary of this revision. mibintc added a comment.
Rebased to ToT. It fixes the previous illegal type lowering problems. It also updates the tests to show the functionality in a better way as well as fixes a newly found problem. Ready for your code review and +1 We think this patch provides basic functionality for the intrinsic, and enhancements can be added in future patches. Thanks! Repository: rG LLVM Github Monorepo CHANGES SINCE LAST ACTION https://reviews.llvm.org/D99675/new/ https://reviews.llvm.org/D99675 Files: llvm/include/llvm/Analysis/TargetTransformInfoImpl.h llvm/include/llvm/CodeGen/BasicTTIImpl.h llvm/include/llvm/CodeGen/ISDOpcodes.h llvm/include/llvm/CodeGen/SelectionDAGISel.h llvm/include/llvm/IR/IRBuilder.h llvm/include/llvm/IR/Intrinsics.td llvm/include/llvm/Support/TargetOpcodes.def llvm/include/llvm/Target/Target.td llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp llvm/test/CodeGen/X86/arithmetic_fence.ll
Index: llvm/test/CodeGen/X86/arithmetic_fence.ll =================================================================== --- /dev/null +++ llvm/test/CodeGen/X86/arithmetic_fence.ll @@ -0,0 +1,161 @@ +; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py +; RUN: llc < %s -mtriple=i686-unknown-unknown -mattr=+fma | FileCheck %s --check-prefix=X86 +; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=+fma | FileCheck %s --check-prefix=X64 + +define float @f1(float %a, float %b, float %c) { +; X86-LABEL: f1: +; X86: # %bb.0: +; X86-NEXT: pushl %eax +; X86-NEXT: .cfi_def_cfa_offset 8 +; X86-NEXT: vmovss {{.*#+}} xmm0 = mem[0],zero,zero,zero +; X86-NEXT: vmovss {{.*#+}} xmm1 = mem[0],zero,zero,zero +; X86-NEXT: vfmadd213ss {{.*#+}} xmm1 = (xmm0 * xmm1) + mem +; X86-NEXT: vmovss %xmm1, (%esp) +; X86-NEXT: flds (%esp) +; X86-NEXT: popl %eax +; X86-NEXT: .cfi_def_cfa_offset 4 +; X86-NEXT: retl +; +; X64-LABEL: f1: +; X64: # %bb.0: +; X64-NEXT: vfmadd213ss {{.*#+}} xmm0 = (xmm1 * xmm0) + xmm2 +; X64-NEXT: retq + %mul = fmul fast float %b, %a + %add = fadd fast float %mul, %c + ret float %add +} + +define float @f2(float %a, float %b, float %c) { +; X86-LABEL: f2: +; X86: # %bb.0: +; X86-NEXT: pushl %eax +; X86-NEXT: .cfi_def_cfa_offset 8 +; X86-NEXT: vmovss {{.*#+}} xmm0 = mem[0],zero,zero,zero +; X86-NEXT: vmulss {{[0-9]+}}(%esp), %xmm0, %xmm0 +; X86-NEXT: #ARITH_FENCE +; X86-NEXT: vaddss {{[0-9]+}}(%esp), %xmm0, %xmm0 +; X86-NEXT: vmovss %xmm0, (%esp) +; X86-NEXT: flds (%esp) +; X86-NEXT: popl %eax +; X86-NEXT: .cfi_def_cfa_offset 4 +; X86-NEXT: retl +; +; X64-LABEL: f2: +; X64: # %bb.0: +; X64-NEXT: vmulss %xmm0, %xmm1, %xmm0 +; X64-NEXT: #ARITH_FENCE +; X64-NEXT: vaddss %xmm2, %xmm0, %xmm0 +; X64-NEXT: retq + %mul = fmul fast float %b, %a + %tmp = call float @llvm.arithmetic.fence.f32(float %mul) + %add = fadd fast float %tmp, %c + ret float %add +} + +define double @f3(double %a) { +; X86-LABEL: f3: +; X86: # %bb.0: +; X86-NEXT: pushl %ebp +; X86-NEXT: .cfi_def_cfa_offset 8 +; X86-NEXT: .cfi_offset %ebp, -8 +; X86-NEXT: movl %esp, %ebp +; X86-NEXT: .cfi_def_cfa_register %ebp +; X86-NEXT: andl $-8, %esp +; X86-NEXT: subl $8, %esp +; X86-NEXT: vmovsd {{.*#+}} xmm0 = mem[0],zero +; X86-NEXT: vmulsd {{\.LCPI[0-9]+_[0-9]+}}, %xmm0, %xmm0 +; X86-NEXT: vmovsd %xmm0, (%esp) +; X86-NEXT: fldl (%esp) +; X86-NEXT: movl %ebp, %esp +; X86-NEXT: popl %ebp +; X86-NEXT: .cfi_def_cfa %esp, 4 +; X86-NEXT: retl +; +; X64-LABEL: f3: +; X64: # %bb.0: +; X64-NEXT: vmulsd {{.*}}(%rip), %xmm0, %xmm0 +; X64-NEXT: retq + %1 = fadd fast double %a, %a + %2 = fadd fast double %a, %a + %3 = fadd fast double %1, %2 + ret double %3 +} + +define double @f4(double %a) { +; X86-LABEL: f4: +; X86: # %bb.0: +; X86-NEXT: pushl %ebp +; X86-NEXT: .cfi_def_cfa_offset 8 +; X86-NEXT: .cfi_offset %ebp, -8 +; X86-NEXT: movl %esp, %ebp +; X86-NEXT: .cfi_def_cfa_register %ebp +; X86-NEXT: andl $-8, %esp +; X86-NEXT: subl $8, %esp +; X86-NEXT: vmovsd {{.*#+}} xmm0 = mem[0],zero +; X86-NEXT: vaddsd %xmm0, %xmm0, %xmm0 +; X86-NEXT: vmovapd %xmm0, %xmm1 +; X86-NEXT: #ARITH_FENCE +; X86-NEXT: vaddsd %xmm0, %xmm1, %xmm0 +; X86-NEXT: vmovsd %xmm0, (%esp) +; X86-NEXT: fldl (%esp) +; X86-NEXT: movl %ebp, %esp +; X86-NEXT: popl %ebp +; X86-NEXT: .cfi_def_cfa %esp, 4 +; X86-NEXT: retl +; +; X64-LABEL: f4: +; X64: # %bb.0: +; X64-NEXT: vaddsd %xmm0, %xmm0, %xmm0 +; X64-NEXT: vmovapd %xmm0, %xmm1 +; X64-NEXT: #ARITH_FENCE +; X64-NEXT: vaddsd %xmm0, %xmm1, %xmm0 +; X64-NEXT: retq + %1 = fadd fast double %a, %a + %t = call double @llvm.arithmetic.fence.f64(double %1) + %2 = fadd fast double %a, %a + %3 = fadd fast double %t, %2 + ret double %3 +} + +define <2 x float> @f5(<2 x float> %a) { +; X86-LABEL: f5: +; X86: # %bb.0: +; X86-NEXT: vmulps {{\.LCPI[0-9]+_[0-9]+}}, %xmm0, %xmm0 +; X86-NEXT: retl +; +; X64-LABEL: f5: +; X64: # %bb.0: +; X64-NEXT: vmulps {{.*}}(%rip), %xmm0, %xmm0 +; X64-NEXT: retq + %1 = fadd fast <2 x float> %a, %a + %2 = fadd fast <2 x float> %a, %a + %3 = fadd fast <2 x float> %1, %2 + ret <2 x float> %3 +} + +define <2 x float> @f6(<2 x float> %a) { +; X86-LABEL: f6: +; X86: # %bb.0: +; X86-NEXT: vaddps %xmm0, %xmm0, %xmm0 +; X86-NEXT: vmovaps %xmm0, %xmm1 +; X86-NEXT: #ARITH_FENCE +; X86-NEXT: vaddps %xmm0, %xmm1, %xmm0 +; X86-NEXT: retl +; +; X64-LABEL: f6: +; X64: # %bb.0: +; X64-NEXT: vaddps %xmm0, %xmm0, %xmm0 +; X64-NEXT: vmovaps %xmm0, %xmm1 +; X64-NEXT: #ARITH_FENCE +; X64-NEXT: vaddps %xmm0, %xmm1, %xmm0 +; X64-NEXT: retq + %1 = fadd fast <2 x float> %a, %a + %t = call <2 x float> @llvm.arithmetic.fence.v2f32(<2 x float> %1) + %2 = fadd fast <2 x float> %a, %a + %3 = fadd fast <2 x float> %t, %2 + ret <2 x float> %3 +} + +declare float @llvm.arithmetic.fence.f32(float) +declare double @llvm.arithmetic.fence.f64(double) +declare <2 x float> @llvm.arithmetic.fence.v2f32(<2 x float>) Index: llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp =================================================================== --- llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp +++ llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp @@ -2325,6 +2325,11 @@ N->getOperand(0)); } +void SelectionDAGISel::Select_ARITH_FENCE(SDNode *N) { + CurDAG->SelectNodeTo(N, TargetOpcode::ARITH_FENCE, N->getValueType(0), + N->getOperand(0)); +} + /// GetVBR - decode a vbr encoding whose top bit is set. LLVM_ATTRIBUTE_ALWAYS_INLINE static uint64_t GetVBR(uint64_t Val, const unsigned char *MatcherTable, unsigned &Idx) { @@ -2876,6 +2881,9 @@ case ISD::FREEZE: Select_FREEZE(NodeToMatch); return; + case ISD::ARITH_FENCE: + Select_ARITH_FENCE(NodeToMatch); + return; } assert(!NodeToMatch->isMachineOpcode() && "Node already selected!"); Index: llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp =================================================================== --- llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp +++ llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp @@ -6292,6 +6292,15 @@ getValue(I.getArgOperand(0)), getValue(I.getArgOperand(1)), Flags)); return; + case Intrinsic::arithmetic_fence: { + auto DL = getCurSDLoc(); + + SDValue Val = getValue(I.getArgOperand(0)); + EVT ResultVT = TLI.getValueType(DAG.getDataLayout(), I.getType()); + + setValue(&I, DAG.getNode(ISD::ARITH_FENCE, DL, ResultVT, Val)); + return; + } case Intrinsic::fma: setValue(&I, DAG.getNode( ISD::FMA, sdl, getValue(I.getArgOperand(0)).getValueType(), Index: llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp =================================================================== --- llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp +++ llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp @@ -3146,6 +3146,7 @@ case ISD::CTTZ_ZERO_UNDEF: case ISD::FNEG: case ISD::FREEZE: + case ISD::ARITH_FENCE: case ISD::FCANONICALIZE: Res = WidenVecRes_Unary(N); break; Index: llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp =================================================================== --- llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp +++ llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp @@ -1328,6 +1328,9 @@ case TargetOpcode::PSEUDO_PROBE: emitPseudoProbe(MI); break; + case TargetOpcode::ARITH_FENCE: + OutStreamer->emitRawComment("ARITH_FENCE"); + break; default: emitInstruction(&MI); if (CanDoExtraAnalysis) { Index: llvm/include/llvm/Target/Target.td =================================================================== --- llvm/include/llvm/Target/Target.td +++ llvm/include/llvm/Target/Target.td @@ -1170,6 +1170,13 @@ let AsmString = "PSEUDO_PROBE"; let hasSideEffects = 1; } +def ARITH_FENCE : StandardPseudoInstruction { + let OutOperandList = (outs unknown:$dst); + let InOperandList = (ins unknown:$src); + let AsmString = ""; + let hasSideEffects = false; + let Constraints = "$src = $dst"; +} def STACKMAP : StandardPseudoInstruction { let OutOperandList = (outs); Index: llvm/include/llvm/Support/TargetOpcodes.def =================================================================== --- llvm/include/llvm/Support/TargetOpcodes.def +++ llvm/include/llvm/Support/TargetOpcodes.def @@ -117,6 +117,9 @@ /// Pseudo probe HANDLE_TARGET_OPCODE(PSEUDO_PROBE) +/// Arithmetic fence. +HANDLE_TARGET_OPCODE(ARITH_FENCE) + /// A Stackmap instruction captures the location of live variables at its /// position in the instruction stream. It is followed by a shadow of bytes /// that must lie within the function and not contain another stackmap. Index: llvm/include/llvm/IR/Intrinsics.td =================================================================== --- llvm/include/llvm/IR/Intrinsics.td +++ llvm/include/llvm/IR/Intrinsics.td @@ -1327,6 +1327,10 @@ def int_pseudoprobe : Intrinsic<[], [llvm_i64_ty, llvm_i64_ty, llvm_i32_ty, llvm_i64_ty], [IntrInaccessibleMemOnly, IntrWillReturn]>; +// Arithmetic fence intrinsic. +def int_arithmetic_fence : Intrinsic<[llvm_anyfloat_ty], [LLVMMatchType<0>], [IntrNoMem]>; + + // Intrinsics to support half precision floating point format // Intrinsics to support half precision floating point format let IntrProperties = [IntrNoMem, IntrWillReturn] in { def int_convert_to_fp16 : DefaultAttrsIntrinsic<[llvm_i16_ty], [llvm_anyfloat_ty]>; Index: llvm/include/llvm/IR/IRBuilder.h =================================================================== --- llvm/include/llvm/IR/IRBuilder.h +++ llvm/include/llvm/IR/IRBuilder.h @@ -897,6 +897,13 @@ return CreateBinaryIntrinsic(Intrinsic::maximum, LHS, RHS, nullptr, Name); } + /// Create a call to the arithmetic_fence intrinsic. + CallInst *CreateArithmeticFence(Value *Val, Type *DstType, + const Twine &Name = "") { + return CreateIntrinsic(Intrinsic::arithmetic_fence, {DstType}, {Val}, nullptr, + Name); + } + /// Create a call to the experimental.vector.extract intrinsic. CallInst *CreateExtractVector(Type *DstType, Value *SrcVec, Value *Idx, const Twine &Name = "") { Index: llvm/include/llvm/CodeGen/SelectionDAGISel.h =================================================================== --- llvm/include/llvm/CodeGen/SelectionDAGISel.h +++ llvm/include/llvm/CodeGen/SelectionDAGISel.h @@ -318,6 +318,7 @@ void CannotYetSelect(SDNode *N); void Select_FREEZE(SDNode *N); + void Select_ARITH_FENCE(SDNode *N); private: void DoInstructionSelection(); Index: llvm/include/llvm/CodeGen/ISDOpcodes.h =================================================================== --- llvm/include/llvm/CodeGen/ISDOpcodes.h +++ llvm/include/llvm/CodeGen/ISDOpcodes.h @@ -1090,6 +1090,10 @@ /// specifier. PREFETCH, + /// ARITH_FENCE - This corresponds to a arithmetic fence intrinsic. Both its + /// operand and output are the same floating type. + ARITH_FENCE, + /// OUTCHAIN = ATOMIC_FENCE(INCHAIN, ordering, scope) /// This corresponds to the fence instruction. It takes an input chain, and /// two integer constants: an AtomicOrdering and a SynchronizationScope. Index: llvm/include/llvm/CodeGen/BasicTTIImpl.h =================================================================== --- llvm/include/llvm/CodeGen/BasicTTIImpl.h +++ llvm/include/llvm/CodeGen/BasicTTIImpl.h @@ -1605,6 +1605,7 @@ case Intrinsic::lifetime_end: case Intrinsic::sideeffect: case Intrinsic::pseudoprobe: + case Intrinsic::arithmetic_fence: return 0; case Intrinsic::masked_store: { Type *Ty = Tys[0]; Index: llvm/include/llvm/Analysis/TargetTransformInfoImpl.h =================================================================== --- llvm/include/llvm/Analysis/TargetTransformInfoImpl.h +++ llvm/include/llvm/Analysis/TargetTransformInfoImpl.h @@ -576,6 +576,7 @@ case Intrinsic::assume: case Intrinsic::sideeffect: case Intrinsic::pseudoprobe: + case Intrinsic::arithmetic_fence: case Intrinsic::dbg_declare: case Intrinsic::dbg_value: case Intrinsic::dbg_label:
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