[llvm] [RISCV][VLOPT] Add masked load to isSupported and getOperandInfo (PR #122030)

[Michael Maitland via llvm-commits]

https://github.com/michaelmaitland created https://github.com/llvm/llvm-project/pull/122030

None

>From e9069db86b859a9d6bf801a927cc21c193f7fbae Mon Sep 17 00:00:00 2001
From: Michael Maitland <michaeltmaitland at gmail.com>
Date: Tue, 7 Jan 2025 12:51:18 -0800
Subject: [PATCH] [RISCV][VLOPT] Add masked load to isSupported and
 getOperandInfo

---
 llvm/lib/Target/RISCV/RISCVVLOptimizer.cpp    |  4 +++
 .../test/CodeGen/RISCV/rvv/vl-opt-op-info.mir | 30 +++++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/llvm/lib/Target/RISCV/RISCVVLOptimizer.cpp b/llvm/lib/Target/RISCV/RISCVVLOptimizer.cpp
index d7ac3afe7b76b2..2acdefcc6d505d 100644
--- a/llvm/lib/Target/RISCV/RISCVVLOptimizer.cpp
+++ b/llvm/lib/Target/RISCV/RISCVVLOptimizer.cpp
@@ -257,6 +257,9 @@ static OperandInfo getOperandInfo(const MachineOperand &MO,
   // Vector Unit-Stride Instructions
   // Vector Strided Instructions
   /// Dest EEW encoded in the instruction and EMUL=(EEW/SEW)*LMUL
+  case RISCV::VLM_V:
+  case RISCV::VSM_V:
+    return OperandInfo(RISCVVType::getEMULEqualsEEWDivSEWTimesLMUL(0, MI), 0);
   case RISCV::VLE8_V:
   case RISCV::VSE8_V:
   case RISCV::VLSE8_V:
@@ -742,6 +745,7 @@ static bool isSupportedInstr(const MachineInstr &MI) {
   switch (RVV->BaseInstr) {
   // Vector Unit-Stride Instructions
   // Vector Strided Instructions
+  case RISCV::VLM_V:
   case RISCV::VLE8_V:
   case RISCV::VLSE8_V:
   case RISCV::VLE16_V:
diff --git a/llvm/test/CodeGen/RISCV/rvv/vl-opt-op-info.mir b/llvm/test/CodeGen/RISCV/rvv/vl-opt-op-info.mir
index a1bbfc8a7d3514..689809f6201054 100644
--- a/llvm/test/CodeGen/RISCV/rvv/vl-opt-op-info.mir
+++ b/llvm/test/CodeGen/RISCV/rvv/vl-opt-op-info.mir
@@ -603,6 +603,36 @@ body: |
     %x:vr = PseudoVADD_VV_MF2 $noreg, %x, $noreg, 1, 3 /* e8 */, 0
 ...
 ---
+name: vlm_v
+body: |
+  bb.0:
+    ; CHECK-LABEL: name: vlm_v
+    ; CHECK: %x:vr = PseudoVLM_V_B8 $noreg, $noreg, 1, 0 /* e8 */, 0 /* tu, mu */
+    ; CHECK-NEXT: %y:vr = PseudoVMAND_MM_B8 $noreg, %x, 1, 0 /* e8 */
+    %x:vr = PseudoVLM_V_B8 $noreg, $noreg, -1, 0, 0
+    %y:vr = PseudoVMAND_MM_B8 $noreg, %x, 1, 0
+...
+---
+name: vlm_v_incompatible_eew
+body: |
+  bb.0:
+    ; CHECK-LABEL: name: vlm_v_incompatible_eew
+    ; CHECK: %x:vr = PseudoVLM_V_B8 $noreg, $noreg, -1, 0 /* e8 */, 0 /* tu, mu */
+    ; CHECK-NEXT: %y:vr = PseudoVADD_VV_M1 $noreg, $noreg, %x, 1, 4 /* e16 */, 0 /* tu, mu */
+    %x:vr = PseudoVLM_V_B8 $noreg, $noreg, -1, 0, 0
+    %y:vr = PseudoVADD_VV_M1 $noreg, $noreg, %x, 1, 4 /* e16 */, 0
+...
+---
+name: vlm_v_incompatible_emul
+body: |
+  bb.0:
+    ; CHECK-LABEL: name: vlm_v_incompatible_emul
+    ; CHECK: %x:vr = PseudoVLM_V_B8 $noreg, $noreg, -1, 0 /* e8 */, 0 /* tu, mu */
+    ; CHECK-NEXT: %y:vr = PseudoVMAND_MM_B16 $noreg, %x, 1, 0 /* e8 */
+    %x:vr = PseudoVLM_V_B8 $noreg, $noreg, -1, 0, 0
+    %y:vr = PseudoVMAND_MM_B16 $noreg, %x, 1, 0
+...
+---
 name: vsseN_v
 body: |
   bb.0: