Author: 林克
Date: 2025-08-18T18:03:17+08:00
New Revision: 6842cc556222659256b32883bb2b63ff019100e0

URL: 
https://github.com/llvm/llvm-project/commit/6842cc556222659256b32883bb2b63ff019100e0
DIFF: 
https://github.com/llvm/llvm-project/commit/6842cc556222659256b32883bb2b63ff019100e0.diff

LOG: [RISCV] Add SpacemiT XSMTVDot (SpacemiT Vector Dot Product) extension. 
(#151706)

The full spec can be found at spacemit-x60 processor support scope:
Section 2.1.2.2 (Features):

https://developer.spacemit.com/documentation?token=BWbGwbx7liGW21kq9lucSA6Vnpb#2.1

This patch only supports assembler.

Added: 
    llvm/lib/Target/RISCV/RISCVInstrInfoXSpacemiT.td
    llvm/test/MC/RISCV/xsmtvdot-invalid.s
    llvm/test/MC/RISCV/xsmtvdot-valid.s

Modified: 
    clang/test/Driver/print-supported-extensions-riscv.c
    clang/test/Driver/riscv-cpus.c
    llvm/docs/RISCVUsage.rst
    llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
    llvm/lib/Target/RISCV/RISCVFeatures.td
    llvm/lib/Target/RISCV/RISCVInstrInfo.td
    llvm/lib/Target/RISCV/RISCVProcessors.td
    llvm/test/CodeGen/RISCV/features-info.ll
    llvm/unittests/TargetParser/RISCVISAInfoTest.cpp

Removed: 
    


################################################################################
diff  --git a/clang/test/Driver/print-supported-extensions-riscv.c 
b/clang/test/Driver/print-supported-extensions-riscv.c
index 87bbd95877b25..f1a1359b5f555 100644
--- a/clang/test/Driver/print-supported-extensions-riscv.c
+++ b/clang/test/Driver/print-supported-extensions-riscv.c
@@ -194,6 +194,7 @@
 // CHECK-NEXT:     xsfvqmaccqoq         1.0       'XSfvqmaccqoq' (SiFive Int8 
Matrix Multiplication Instructions (4-by-8 and 8-by-4))
 // CHECK-NEXT:     xsifivecdiscarddlone 1.0       'XSiFivecdiscarddlone' 
(SiFive sf.cdiscard.d.l1 Instruction)
 // CHECK-NEXT:     xsifivecflushdlone   1.0       'XSiFivecflushdlone' (SiFive 
sf.cflush.d.l1 Instruction)
+// CHECK-NEXT:     xsmtvdot             1.0       'XSMTVDot' (SpacemiT Vector 
Dot Product Extension)
 // CHECK-NEXT:     xtheadba             1.0       'XTHeadBa' (T-Head address 
calculation instructions)
 // CHECK-NEXT:     xtheadbb             1.0       'XTHeadBb' (T-Head basic 
bit-manipulation instructions)
 // CHECK-NEXT:     xtheadbs             1.0       'XTHeadBs' (T-Head 
single-bit instructions)

diff  --git a/clang/test/Driver/riscv-cpus.c b/clang/test/Driver/riscv-cpus.c
index 2a9c4e7021feb..ea0821cc39c45 100644
--- a/clang/test/Driver/riscv-cpus.c
+++ b/clang/test/Driver/riscv-cpus.c
@@ -157,6 +157,7 @@
 // MCPU-SPACEMIT-X60-SAME: "-target-feature" "+svinval"
 // MCPU-SPACEMIT-X60-SAME: "-target-feature" "+svnapot"
 // MCPU-SPACEMIT-X60-SAME: "-target-feature" "+svpbmt"
+// MCPU-SPACEMIT-X60-SAME: "-target-feature" "+xsmtvdot"
 // MCPU-SPACEMIT-X60-SAME: "-target-abi" "lp64d"
 
 // We cannot check much for -mcpu=native, but it should be replaced by a valid 
CPU string.

diff  --git a/llvm/docs/RISCVUsage.rst b/llvm/docs/RISCVUsage.rst
index a29e06cdf838d..f9f3e39727a5a 100644
--- a/llvm/docs/RISCVUsage.rst
+++ b/llvm/docs/RISCVUsage.rst
@@ -531,6 +531,10 @@ The current vendor extensions supported are:
 ``XAndesVDot``
   LLVM implements `version 5.0.0 of the Andes Vector Dot Product Extension 
specification 
<https://github.com/andestech/andes-v5-isa/releases/download/ast-v5_4_0-release/AndeStar_V5_ISA_Spec_UM165-v1.5.08-20250317.pdf>`__
 by Andes Technology. All instructions are prefixed with `nds.` as described in 
the specification.
 
+``XSMTVDot``
+  SpacemiT defines `Intrinsic Matrix Extension (IME) specification 
<https://github.com/space-mit/riscv-ime-extension-spec/releases/tag/v0429>`__.
+  LLVM implement the hardware-adapted subset for SpacemiT X60, defined in the 
`feature document 
<https://developer.spacemit.com/documentation?token=BWbGwbx7liGW21kq9lucSA6Vnpb#2.1>`__
 by SpacemiT. All instructions are prefixed with `smt.` as described in the 
implementation guide. Note that this implemented subset is `version 1.0.0 of 
the SpacemiT Vector Dot Product Extension specification`, which is strictly a 
subset of the full IME specification to reflect the capabilities of SpacemiT 
X60 hardware correctly.
+
 Experimental C Intrinsics
 =========================
 

diff  --git a/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp 
b/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
index e0ac59141695f..78be55b3a51d3 100644
--- a/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
+++ b/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
@@ -672,6 +672,8 @@ static constexpr FeatureBitset XAndesGroup = {
     RISCV::FeatureVendorXAndesVSIntLoad, RISCV::FeatureVendorXAndesVPackFPH,
     RISCV::FeatureVendorXAndesVDot};
 
+static constexpr FeatureBitset XSMTGroup = {RISCV::FeatureVendorXSMTVDot};
+
 static constexpr DecoderListEntry DecoderList32[]{
     // Vendor Extensions
     {DecoderTableXCV32, XCVFeatureGroup, "CORE-V extensions"},
@@ -692,6 +694,7 @@ static constexpr DecoderListEntry DecoderList32[]{
      {RISCV::FeatureVendorXMIPSCBOP},
      "MIPS mips.pref"},
     {DecoderTableXAndes32, XAndesGroup, "Andes extensions"},
+    {DecoderTableXSMT32, XSMTGroup, "SpacemiT extensions"},
     // Standard Extensions
     {DecoderTable32, {}, "standard 32-bit instructions"},
     {DecoderTableRV32Only32, {}, "RV32-only standard 32-bit instructions"},

diff  --git a/llvm/lib/Target/RISCV/RISCVFeatures.td 
b/llvm/lib/Target/RISCV/RISCVFeatures.td
index ac0234dd9a5f5..d4ac3c60e2d4c 100644
--- a/llvm/lib/Target/RISCV/RISCVFeatures.td
+++ b/llvm/lib/Target/RISCV/RISCVFeatures.td
@@ -1642,6 +1642,14 @@ def HasVendorXAndesVDot
       AssemblerPredicate<(all_of FeatureVendorXAndesVDot),
                          "'XAndesVDot' (Andes Vector Dot Product Extension)">;
 
+def FeatureVendorXSMTVDot
+    : RISCVExtension<1, 0, "SpacemiT Vector Dot Product Extension",
+                     [FeatureStdExtZve32f]>;
+def HasVendorXSMTVDot
+    : Predicate<"Subtarget->hasVendorXSMTVDot()">,
+      AssemblerPredicate<(all_of FeatureVendorXSMTVDot),
+                         "'XSMTVDot' (SpacemiT Vector Dot Product Extension)">;
+
 
//===----------------------------------------------------------------------===//
 // LLVM specific features and extensions
 
//===----------------------------------------------------------------------===//

diff  --git a/llvm/lib/Target/RISCV/RISCVInstrInfo.td 
b/llvm/lib/Target/RISCV/RISCVInstrInfo.td
index 2a34a24a6ae20..8cbdf0ec7fa33 100644
--- a/llvm/lib/Target/RISCV/RISCVInstrInfo.td
+++ b/llvm/lib/Target/RISCV/RISCVInstrInfo.td
@@ -2381,6 +2381,7 @@ include "RISCVInstrInfoXqccmp.td"
 include "RISCVInstrInfoXMips.td"
 include "RISCVInstrInfoXRivos.td"
 include "RISCVInstrInfoXAndes.td"
+include "RISCVInstrInfoXSpacemiT.td"
 
 
//===----------------------------------------------------------------------===//
 // Global ISel

diff  --git a/llvm/lib/Target/RISCV/RISCVInstrInfoXSpacemiT.td 
b/llvm/lib/Target/RISCV/RISCVInstrInfoXSpacemiT.td
new file mode 100644
index 0000000000000..980931ea12a4f
--- /dev/null
+++ b/llvm/lib/Target/RISCV/RISCVInstrInfoXSpacemiT.td
@@ -0,0 +1,139 @@
+//===-- RISCVInstrInfoXSpacemiT.td -------------------------*- tablegen 
-*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM 
Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file describes the vendor extensions defined by SpacemiT.
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+// Operand definitions.
+//===----------------------------------------------------------------------===//
+
+class SMTVDotOpcode<bits<7> val> {
+  bits<7> Value = val;
+}
+
+class SMTVEncoding2<bits<2> val> {
+  bits<2> Value = val;
+}
+
+def OPMMA       : SMTVDotOpcode<0b1110001>;
+def OPMMA_SLIDE : SMTVDotOpcode<0b1110011>;
+
+//===----------------------------------------------------------------------===//
+// Vector Dot-Product Sign Encoding
+// Defines the signed/unsigned mixing modes for vector dot-product operations.
+// Encoding format: [1:0] bits
+//   00: UU (Unsigned x Unsigned)
+//   01: US (Unsigned x Signed)
+//   10: SU (Signed x Unsigned)
+//   11: SS (Signed x Signed)
+//===----------------------------------------------------------------------===//
+def SMT_VDot_UU        : SMTVEncoding2<0b00>;
+def SMT_VDot_US        : SMTVEncoding2<0b01>;
+def SMT_VDot_SU        : SMTVEncoding2<0b10>;
+def SMT_VDot_SS        : SMTVEncoding2<0b11>;
+
+//===----------------------------------------------------------------------===//
+// Vector Dot-Product Sliding Window Modes
+// Encoding format: [1:0] bits
+//   00: Slide1 (1-element sliding stride)
+//   01: Slide2 (2-element sliding stride)
+//   10: Slide3 (3-element sliding stride)
+//   11: Reserved
+//
+// Used in sliding-window dot-product operations:
+//   vd = vs1 • vs2.slide{1|2|3}  // • = dot product
+//===----------------------------------------------------------------------===//
+def SMT_VDot_Slide1 : SMTVEncoding2<0b00>;
+def SMT_VDot_Slide2 : SMTVEncoding2<0b01>;
+def SMT_VDot_Slide3 : SMTVEncoding2<0b10>;
+
+//===----------------------------------------------------------------------===//
+// Instruction formats
+//===----------------------------------------------------------------------===//
+
+let hasSideEffects = 0, mayLoad = 0, mayStore = 0 in {
+// Base vector dot product (no slide) format.
+class RVInstSMTVDot<SMTVEncoding2 sign, string opcodestr, string argstr>
+    : RVInst<(outs VRM2:$vd), (ins VR:$vs1, VR:$vs2), opcodestr, argstr, [], 
InstFormatR> {
+  bits<5> vd;
+  bits<5> vs1;
+  bits<5> vs2;
+
+  let Inst{31-25} = OPMMA.Value;
+  let Inst{24-20} = vs2;
+  let Inst{19-15} = vs1;
+  let Inst{14} = 0b0;
+  let Inst{13-12} = sign.Value;
+  let Inst{11-8} = vd{4-1};
+  let Inst{7} = 0b0;
+  let Inst{6-0} = OPC_CUSTOM_1.Value;
+}
+
+// Sliding-window vector dot product format.
+class RVInstSMTVDotSlide<SMTVEncoding2 funct2, SMTVEncoding2 sign, string 
opcodestr, string argstr>
+    : RVInst<(outs VRM2:$vd), (ins VRM2:$vs1, VR:$vs2), opcodestr, argstr, [], 
InstFormatR> {
+  bits<5> vd;
+  bits<5> vs1;
+  bits<5> vs2;
+
+  let Inst{31-25} = OPMMA_SLIDE.Value;
+  let Inst{24-20} = vs2;
+  let Inst{19-16} = vs1{4-1};
+  let Inst{15-14} = funct2.Value;
+  let Inst{13-12} = sign.Value;
+  let Inst{11-8} = vd{4-1};
+  let Inst{7} = 0b0;
+  let Inst{6-0} = OPC_CUSTOM_1.Value;
+}
+}
+
+//===----------------------------------------------------------------------===//
+// Instructions
+//===----------------------------------------------------------------------===//
+
+let DecoderNamespace = "XSMT" in {
+
+let Predicates = [HasVendorXSMTVDot], ElementsDependOn = EltDepsVL in {
+// Base vector dot product (no slide) instructions
+// NOTE: Destination registers (vd) MUST be even-numbered (v0, v2, ..., v30)
+//       due to hardware alignment constraints. Using odd registers may cause 
undefined behavior.
+def VMADOT   : RVInstSMTVDot<SMT_VDot_SS, "smt.vmadot",   "$vd, $vs1, $vs2">;
+def VMADOTU  : RVInstSMTVDot<SMT_VDot_UU, "smt.vmadotu",  "$vd, $vs1, $vs2">;
+def VMADOTSU : RVInstSMTVDot<SMT_VDot_SU, "smt.vmadotsu", "$vd, $vs1, $vs2">;
+def VMADOTUS : RVInstSMTVDot<SMT_VDot_US, "smt.vmadotus", "$vd, $vs1, $vs2">;
+
+//===----------------------------------------------------------------------===//
+// Sliding-window Vector Dot Product Instructions
+//
+// The numeric suffix (1, 2, 3) specifies the stride of the sliding window:
+//   1: Window slides by 1 element per operation
+//   2: Window slides by 2 elements per operation
+//   3: Window slides by 3 elements per operation
+//
+// These instructions compute dot products with overlapping operand windows
+// where the window position increments by <N> elements between computations.
+//===----------------------------------------------------------------------===//
+// NOTE: Destination registers (vd) and first source register (vs1) MUST be
+//       even-numbered (v0, v2, ..., v30) due to hardware alignment 
constraints.
+//       Using odd registers may cause undefined behavior.
+def VMADOT1   : RVInstSMTVDotSlide<SMT_VDot_Slide1, SMT_VDot_SS, 
"smt.vmadot1",   "$vd, $vs1, $vs2">;
+def VMADOT1U  : RVInstSMTVDotSlide<SMT_VDot_Slide1, SMT_VDot_UU, 
"smt.vmadot1u",  "$vd, $vs1, $vs2">;
+def VMADOT1SU : RVInstSMTVDotSlide<SMT_VDot_Slide1, SMT_VDot_SU, 
"smt.vmadot1su", "$vd, $vs1, $vs2">;
+def VMADOT1US : RVInstSMTVDotSlide<SMT_VDot_Slide1, SMT_VDot_US, 
"smt.vmadot1us", "$vd, $vs1, $vs2">;
+def VMADOT2   : RVInstSMTVDotSlide<SMT_VDot_Slide2, SMT_VDot_SS, 
"smt.vmadot2",   "$vd, $vs1, $vs2">;
+def VMADOT2U  : RVInstSMTVDotSlide<SMT_VDot_Slide2, SMT_VDot_UU, 
"smt.vmadot2u",  "$vd, $vs1, $vs2">;
+def VMADOT2SU : RVInstSMTVDotSlide<SMT_VDot_Slide2, SMT_VDot_SU, 
"smt.vmadot2su", "$vd, $vs1, $vs2">;
+def VMADOT2US : RVInstSMTVDotSlide<SMT_VDot_Slide2, SMT_VDot_US, 
"smt.vmadot2us", "$vd, $vs1, $vs2">;
+def VMADOT3   : RVInstSMTVDotSlide<SMT_VDot_Slide3, SMT_VDot_SS, 
"smt.vmadot3",   "$vd, $vs1, $vs2">;
+def VMADOT3U  : RVInstSMTVDotSlide<SMT_VDot_Slide3, SMT_VDot_UU, 
"smt.vmadot3u",  "$vd, $vs1, $vs2">;
+def VMADOT3SU : RVInstSMTVDotSlide<SMT_VDot_Slide3, SMT_VDot_SU, 
"smt.vmadot3su", "$vd, $vs1, $vs2">;
+def VMADOT3US : RVInstSMTVDotSlide<SMT_VDot_Slide3, SMT_VDot_US, 
"smt.vmadot3us", "$vd, $vs1, $vs2">;
+}
+}
\ No newline at end of file

diff  --git a/llvm/lib/Target/RISCV/RISCVProcessors.td 
b/llvm/lib/Target/RISCV/RISCVProcessors.td
index 31d2b3a10db53..f89d94f41b69f 100644
--- a/llvm/lib/Target/RISCV/RISCVProcessors.td
+++ b/llvm/lib/Target/RISCV/RISCVProcessors.td
@@ -673,6 +673,7 @@ def SPACEMIT_X60 : RISCVProcessorModel<"spacemit-x60",
                                         FeatureStdExtZvfh,
                                         FeatureStdExtZvkt,
                                         FeatureStdExtZvl256b,
+                                        FeatureVendorXSMTVDot,
                                         FeatureUnalignedScalarMem]),
                                        [TuneDLenFactor2,
                                         TuneOptimizedNF2SegmentLoadStore,

diff  --git a/llvm/test/CodeGen/RISCV/features-info.ll 
b/llvm/test/CodeGen/RISCV/features-info.ll
index 60b94adcc4c79..f966f800589b7 100644
--- a/llvm/test/CodeGen/RISCV/features-info.ll
+++ b/llvm/test/CodeGen/RISCV/features-info.ll
@@ -217,6 +217,7 @@
 ; CHECK-NEXT:   xsfvqmaccqoq                     - 'XSfvqmaccqoq' (SiFive Int8 
Matrix Multiplication Instructions (4-by-8 and 8-by-4)).
 ; CHECK-NEXT:   xsifivecdiscarddlone             - 'XSiFivecdiscarddlone' 
(SiFive sf.cdiscard.d.l1 Instruction).
 ; CHECK-NEXT:   xsifivecflushdlone               - 'XSiFivecflushdlone' 
(SiFive sf.cflush.d.l1 Instruction).
+; CHECK-NEXT:   xsmtvdot                         - 'XSMTVDot' (SpacemiT Vector 
Dot Product Extension).
 ; CHECK-NEXT:   xtheadba                         - 'XTHeadBa' (T-Head address 
calculation instructions).
 ; CHECK-NEXT:   xtheadbb                         - 'XTHeadBb' (T-Head basic 
bit-manipulation instructions).
 ; CHECK-NEXT:   xtheadbs                         - 'XTHeadBs' (T-Head 
single-bit instructions).

diff  --git a/llvm/test/MC/RISCV/xsmtvdot-invalid.s 
b/llvm/test/MC/RISCV/xsmtvdot-invalid.s
new file mode 100644
index 0000000000000..9dce654ecc7f5
--- /dev/null
+++ b/llvm/test/MC/RISCV/xsmtvdot-invalid.s
@@ -0,0 +1,52 @@
+# RUN: not llvm-mc -triple riscv32 -mattr=+xsmtvdot < %s 2>&1 \
+# RUN:     | FileCheck %s
+# RUN: not llvm-mc -triple riscv64 -mattr=+xsmtvdot < %s 2>&1 \
+# RUN:     | FileCheck %s
+
+# NoSlide
+smt.vmadot   v1, v2, v2 # CHECK: :[[@LINE]]:14: error: invalid operand for 
instruction
+smt.vmadotu  v1, v2, v2 # CHECK: :[[@LINE]]:14: error: invalid operand for 
instruction
+smt.vmadotsu v1, v2, v2 # CHECK: :[[@LINE]]:14: error: invalid operand for 
instruction
+smt.vmadotus v1, v2, v2 # CHECK: :[[@LINE]]:14: error: invalid operand for 
instruction
+
+# Slide = 1
+smt.vmadot1   v1, v2, v2 # CHECK: :[[@LINE]]:15: error: invalid operand for 
instruction
+smt.vmadot1u  v1, v2, v2 # CHECK: :[[@LINE]]:15: error: invalid operand for 
instruction
+smt.vmadot1su v1, v2, v2 # CHECK: :[[@LINE]]:15: error: invalid operand for 
instruction
+smt.vmadot1us v1, v2, v2 # CHECK: :[[@LINE]]:15: error: invalid operand for 
instruction
+smt.vmadot1   v2, v1, v2 # CHECK: :[[@LINE]]:19: error: invalid operand for 
instruction
+smt.vmadot1u  v2, v1, v2 # CHECK: :[[@LINE]]:19: error: invalid operand for 
instruction
+smt.vmadot1su v2, v1, v2 # CHECK: :[[@LINE]]:19: error: invalid operand for 
instruction
+smt.vmadot1us v2, v1, v2 # CHECK: :[[@LINE]]:19: error: invalid operand for 
instruction
+smt.vmadot1   v1, v3, v2 # CHECK: :[[@LINE]]:15: error: invalid operand for 
instruction
+smt.vmadot1u  v1, v3, v2 # CHECK: :[[@LINE]]:15: error: invalid operand for 
instruction
+smt.vmadot1su v1, v3, v2 # CHECK: :[[@LINE]]:15: error: invalid operand for 
instruction
+smt.vmadot1us v1, v3, v2 # CHECK: :[[@LINE]]:15: error: invalid operand for 
instruction
+
+# Slide = 2
+smt.vmadot2   v1, v2, v2 # CHECK: :[[@LINE]]:15: error: invalid operand for 
instruction
+smt.vmadot2u  v1, v2, v2 # CHECK: :[[@LINE]]:15: error: invalid operand for 
instruction
+smt.vmadot2su v1, v2, v2 # CHECK: :[[@LINE]]:15: error: invalid operand for 
instruction
+smt.vmadot2us v1, v2, v2 # CHECK: :[[@LINE]]:15: error: invalid operand for 
instruction
+smt.vmadot2   v2, v1, v2 # CHECK: :[[@LINE]]:19: error: invalid operand for 
instruction
+smt.vmadot2u  v2, v1, v2 # CHECK: :[[@LINE]]:19: error: invalid operand for 
instruction
+smt.vmadot2su v2, v1, v2 # CHECK: :[[@LINE]]:19: error: invalid operand for 
instruction
+smt.vmadot2us v2, v1, v2 # CHECK: :[[@LINE]]:19: error: invalid operand for 
instruction
+smt.vmadot2   v1, v3, v2 # CHECK: :[[@LINE]]:15: error: invalid operand for 
instruction
+smt.vmadot2u  v1, v3, v2 # CHECK: :[[@LINE]]:15: error: invalid operand for 
instruction
+smt.vmadot2su v1, v3, v2 # CHECK: :[[@LINE]]:15: error: invalid operand for 
instruction
+smt.vmadot2us v1, v3, v2 # CHECK: :[[@LINE]]:15: error: invalid operand for 
instruction
+
+# Slide = 3
+smt.vmadot3   v1, v2, v2 # CHECK: :[[@LINE]]:15: error: invalid operand for 
instruction
+smt.vmadot3u  v1, v2, v2 # CHECK: :[[@LINE]]:15: error: invalid operand for 
instruction
+smt.vmadot3su v1, v2, v2 # CHECK: :[[@LINE]]:15: error: invalid operand for 
instruction
+smt.vmadot3us v1, v2, v2 # CHECK: :[[@LINE]]:15: error: invalid operand for 
instruction
+smt.vmadot3   v2, v1, v2 # CHECK: :[[@LINE]]:19: error: invalid operand for 
instruction
+smt.vmadot3u  v2, v1, v2 # CHECK: :[[@LINE]]:19: error: invalid operand for 
instruction
+smt.vmadot3su v2, v1, v2 # CHECK: :[[@LINE]]:19: error: invalid operand for 
instruction
+smt.vmadot3us v2, v1, v2 # CHECK: :[[@LINE]]:19: error: invalid operand for 
instruction
+smt.vmadot3   v1, v3, v2 # CHECK: :[[@LINE]]:15: error: invalid operand for 
instruction
+smt.vmadot3u  v1, v3, v2 # CHECK: :[[@LINE]]:15: error: invalid operand for 
instruction
+smt.vmadot3su v1, v3, v2 # CHECK: :[[@LINE]]:15: error: invalid operand for 
instruction
+smt.vmadot3us v1, v3, v2 # CHECK: :[[@LINE]]:15: error: invalid operand for 
instruction
\ No newline at end of file

diff  --git a/llvm/test/MC/RISCV/xsmtvdot-valid.s 
b/llvm/test/MC/RISCV/xsmtvdot-valid.s
new file mode 100644
index 0000000000000..9e66419b10e16
--- /dev/null
+++ b/llvm/test/MC/RISCV/xsmtvdot-valid.s
@@ -0,0 +1,114 @@
+# RUN: llvm-mc -triple=riscv32 -show-encoding --mattr=+xsmtvdot %s \
+# RUN:        | FileCheck %s --check-prefixes=CHECK-ENCODING,CHECK-INST
+# RUN: llvm-mc -triple=riscv64 -show-encoding --mattr=+xsmtvdot %s \
+# RUN:        | FileCheck %s --check-prefixes=CHECK-ENCODING,CHECK-INST
+# RUN: not llvm-mc -triple=riscv32 -show-encoding %s 2>&1 \
+# RUN:        | FileCheck %s --check-prefix=CHECK-ERROR
+# RUN: not llvm-mc -triple=riscv64 -show-encoding %s 2>&1 \
+# RUN:        | FileCheck %s --check-prefix=CHECK-ERROR
+# RUN: llvm-mc -triple=riscv32 -filetype=obj --mattr=+xsmtvdot %s \
+# RUN:        | llvm-objdump -d  --mattr=+xsmtvdot - \
+# RUN:        | FileCheck %s --check-prefix=CHECK-INST
+# RUN: llvm-mc -triple=riscv64 -filetype=obj --mattr=+xsmtvdot %s \
+# RUN:        | llvm-objdump -d  --mattr=+xsmtvdot - \
+# RUN:        | FileCheck %s --check-prefix=CHECK-INST
+# RUN: llvm-mc -triple=riscv32 -filetype=obj --mattr=+xsmtvdot %s \
+# RUN:        | llvm-objdump -d - | FileCheck %s --check-prefix=CHECK-UNKNOWN
+# RUN: llvm-mc -triple=riscv64 -filetype=obj --mattr=+xsmtvdot %s \
+# RUN:        | llvm-objdump -d - | FileCheck %s --check-prefix=CHECK-UNKNOWN
+
+# CHECK-INST: smt.vmadot  v16, v0, v8
+# CHECK-ENCODING: [0x2b,0x38,0x80,0xe2]
+# CHECK-ERROR: instruction requires the following: 'XSMTVDot' (SpacemiT Vector 
Dot Product Extension){{$}}
+# CHECK-UNKNOWN: e280382b <unknown>
+smt.vmadot   v16, v0, v8
+
+# CHECK-INST: smt.vmadotu v18, v1, v9
+# CHECK-ENCODING: [0x2b,0x89,0x90,0xe2]
+# CHECK-ERROR: instruction requires the following: 'XSMTVDot' (SpacemiT Vector 
Dot Product Extension){{$}}
+# CHECK-UNKNOWN: e290892b <unknown>
+smt.vmadotu  v18, v1, v9
+
+# CHECK-INST: smt.vmadotsu        v20, v2, v10
+# CHECK-ENCODING: [0x2b,0x2a,0xa1,0xe2]
+# CHECK-ERROR: instruction requires the following: 'XSMTVDot' (SpacemiT Vector 
Dot Product Extension){{$}}
+# CHECK-UNKNOWN: e2a12a2b <unknown>
+smt.vmadotsu v20, v2, v10
+
+# CHECK-INST: smt.vmadotus        v22, v3, v11
+# CHECK-ENCODING: [0x2b,0x9b,0xb1,0xe2]
+# CHECK-ERROR: instruction requires the following: 'XSMTVDot' (SpacemiT Vector 
Dot Product Extension){{$}}
+# CHECK-UNKNOWN: e2b19b2b <unknown>
+smt.vmadotus v22, v3, v11
+
+# CHECK-INST: smt.vmadot1 v24, v16, v12
+# CHECK-ENCODING: [0x2b,0x3c,0xc8,0xe6]
+# CHECK-ERROR: instruction requires the following: 'XSMTVDot' (SpacemiT Vector 
Dot Product Extension){{$}}
+# CHECK-UNKNOWN: e6c83c2b <unknown>
+smt.vmadot1   v24, v16, v12
+
+# CHECK-INST: smt.vmadot1u        v26, v18, v13
+# CHECK-ENCODING: [0x2b,0x0d,0xd9,0xe6]
+# CHECK-ERROR: instruction requires the following: 'XSMTVDot' (SpacemiT Vector 
Dot Product Extension){{$}}
+# CHECK-UNKNOWN: e6d90d2b <unknown>
+smt.vmadot1u  v26, v18, v13
+
+# CHECK-INST: smt.vmadot1su       v28, v20, v14
+# CHECK-ENCODING: [0x2b,0x2e,0xea,0xe6]
+# CHECK-ERROR: instruction requires the following: 'XSMTVDot' (SpacemiT Vector 
Dot Product Extension){{$}}
+# CHECK-UNKNOWN: e6ea2e2b <unknown>
+smt.vmadot1su v28, v20, v14
+
+# CHECK-INST: smt.vmadot1us       v30, v22, v15
+# CHECK-ENCODING: [0x2b,0x1f,0xfb,0xe6]
+# CHECK-ERROR: instruction requires the following: 'XSMTVDot' (SpacemiT Vector 
Dot Product Extension){{$}}
+# CHECK-UNKNOWN: e6fb1f2b <unknown>
+smt.vmadot1us v30, v22, v15
+
+# CHECK-INST: smt.vmadot2 v0, v24, v4
+# CHECK-ENCODING: [0x2b,0x70,0x4c,0xe6]
+# CHECK-ERROR: instruction requires the following: 'XSMTVDot' (SpacemiT Vector 
Dot Product Extension){{$}}
+# CHECK-UNKNOWN: e64c702b <unknown>
+smt.vmadot2   v0, v24, v4
+
+# CHECK-INST: smt.vmadot2u        v2, v26, v5
+# CHECK-ENCODING: [0x2b,0x41,0x5d,0xe6]
+# CHECK-ERROR: instruction requires the following: 'XSMTVDot' (SpacemiT Vector 
Dot Product Extension){{$}}
+# CHECK-UNKNOWN: e65d412b <unknown>
+smt.vmadot2u  v2, v26, v5
+
+# CHECK-INST: smt.vmadot2su       v4, v28, v6
+# CHECK-ENCODING: [0x2b,0x62,0x6e,0xe6]
+# CHECK-ERROR: instruction requires the following: 'XSMTVDot' (SpacemiT Vector 
Dot Product Extension){{$}}
+# CHECK-UNKNOWN: e66e622b <unknown>
+smt.vmadot2su v4, v28, v6
+
+# CHECK-INST: smt.vmadot2us       v6, v30, v7
+# CHECK-ENCODING: [0x2b,0x53,0x7f,0xe6]
+# CHECK-ERROR: instruction requires the following: 'XSMTVDot' (SpacemiT Vector 
Dot Product Extension){{$}}
+# CHECK-UNKNOWN: e67f532b <unknown>
+smt.vmadot2us v6, v30, v7
+
+# CHECK-INST: smt.vmadot3 v8, v0, v8
+# CHECK-ENCODING: [0x2b,0xb4,0x80,0xe6]
+# CHECK-ERROR: instruction requires the following: 'XSMTVDot' (SpacemiT Vector 
Dot Product Extension){{$}}
+# CHECK-UNKNOWN: e680b42b <unknown>
+smt.vmadot3   v8, v0, v8
+
+# CHECK-INST: smt.vmadot3u        v10, v2, v9
+# CHECK-ENCODING: [0x2b,0x85,0x91,0xe6]
+# CHECK-ERROR: instruction requires the following: 'XSMTVDot' (SpacemiT Vector 
Dot Product Extension){{$}}
+# CHECK-UNKNOWN: e691852b <unknown>
+smt.vmadot3u  v10, v2, v9
+
+# CHECK-INST: smt.vmadot3su       v12, v4, v10
+# CHECK-ENCODING: [0x2b,0xa6,0xa2,0xe6]
+# CHECK-ERROR: instruction requires the following: 'XSMTVDot' (SpacemiT Vector 
Dot Product Extension){{$}}
+# CHECK-UNKNOWN: e6a2a62b <unknown>
+smt.vmadot3su v12, v4, v10
+
+# CHECK-INST: smt.vmadot3us       v14, v6, v11
+# CHECK-ENCODING: [0x2b,0x97,0xb3,0xe6]
+# CHECK-ERROR: instruction requires the following: 'XSMTVDot' (SpacemiT Vector 
Dot Product Extension){{$}}
+# CHECK-UNKNOWN: e6b3972b <unknown>
+smt.vmadot3us v14, v6, v11
\ No newline at end of file

diff  --git a/llvm/unittests/TargetParser/RISCVISAInfoTest.cpp 
b/llvm/unittests/TargetParser/RISCVISAInfoTest.cpp
index db58d95d2d82c..ff0af566b05b7 100644
--- a/llvm/unittests/TargetParser/RISCVISAInfoTest.cpp
+++ b/llvm/unittests/TargetParser/RISCVISAInfoTest.cpp
@@ -1165,6 +1165,7 @@ R"(All available -march extensions for RISC-V
     xsfvqmaccqoq         1.0
     xsifivecdiscarddlone 1.0
     xsifivecflushdlone   1.0
+    xsmtvdot             1.0
     xtheadba             1.0
     xtheadbb             1.0
     xtheadbs             1.0


        
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