[RISCV][VLOPT] Add fp-reductions to getOperandInfo

Author: michaelmaitland

llvm/lib/Target/RISCV/RISCVVLOptimizer.cpp

@@ -723,7 +723,12 @@ static OperandInfo getOperandInfo(const MachineOperand &MO,
   case RISCV::VREDMINU_VS:
   case RISCV::VREDOR_VS:
   case RISCV::VREDSUM_VS:
-  case RISCV::VREDXOR_VS: {
+  case RISCV::VREDXOR_VS:
+  // Vector Single-Width Floating-Point Reduction Instructions
+  case RISCV::VFREDMAX_VS:
+  case RISCV::VFREDMIN_VS:
+  case RISCV::VFREDOSUM_VS:
+  case RISCV::VFREDUSUM_VS: {
     if (MO.getOperandNo() == 2)
       return OperandInfo(MIVLMul, MILog2SEW);
     return OperandInfo(MILog2SEW);

llvm/test/CodeGen/RISCV/rvv/vl-opt-op-info.mir

@@ -1337,3 +1337,52 @@ body: |
     %y:vr = PseudoVREDSUM_VS_M1_E8 $noreg, $noreg, %x, 1, 3 /* e8 */, 0
     %z:vr = PseudoVADD_VV_M1 $noreg, %x, $noreg, 2, 3 /* e8 */, 0
 ...
+name: vfred_vs2
+body: |
+  bb.0:
+    ; CHECK-LABEL: name: vred_vs2
+    ; CHECK: %x:vr = PseudoVADD_VV_M1 $noreg, $noreg, $noreg, 1, 3 /* e8 */, 0 /* tu, mu */
+    ; CHECK-NEXT: %y:vr = PseudoVREDAND_VS_M1_E8 $noreg, %x, $noreg, 1, 3 /* e8 */, 0 /* tu, mu */
+    %x:vr = nofpexcept PseudoVFCVT_X_F_V_M1 $noreg, $noreg, 0, -1, 5 /* e32 */, 0
+    %y:vr = PseudoVFREDMAX_VS_M1_E32 $noreg, %x, $noreg, 1, 5 /* e32 */, 0
+...
+---
+name: vfred_vs1
+body: |
+  bb.0:
+    ; CHECK-LABEL: name: vfred_vs1
+    ; CHECK: %x:vr = nofpexcept PseudoVFCVT_X_F_V_M1 $noreg, $noreg, 0, 1, 5 /* e32 */, 0 /* tu, mu */
+    ; CHECK-NEXT: %y:vr = PseudoVFREDMAX_VS_M1_E32 $noreg, $noreg, %x, 1, 5 /* e32 */, 0 /* tu, mu */
+    %x:vr = nofpexcept PseudoVFCVT_X_F_V_M1 $noreg, $noreg, 0, -1, 5 /* e32 */, 0
+    %y:vr = PseudoVFREDMAX_VS_M1_E32 $noreg, $noreg, %x, 1, 5 /* e32 */, 0
+...
+---
+name: vfred_vs1_vs2
+body: |
+  bb.0:
+    ; CHECK-LABEL: name: vfred_vs1_vs2
+    ; CHECK: %x:vr = nofpexcept PseudoVFCVT_X_F_V_M1 $noreg, $noreg, 0, 1, 5 /* e32 */, 0 /* tu, mu */
+    ; CHECK-NEXT: %y:vr = PseudoVFREDMAX_VS_M1_E32 $noreg, %x, %x, 1, 5 /* e32 */, 0 /* tu, mu */
+    %x:vr = nofpexcept PseudoVFCVT_X_F_V_M1 $noreg, $noreg, 0, -1, 5 /* e32 */, 0
+    %y:vr = PseudoVFREDMAX_VS_M1_E32 $noreg, %x, %x, 1, 5 /* e32 */, 0
+...
+---
+name: vfred_vs1_vs2_incompatible_eew
+body: |
+  bb.0:
+    ; CHECK-LABEL: name: vfred_vs1_vs2_incompatible_eew
+    ; CHECK: %x:vr = nofpexcept PseudoVFCVT_X_F_V_M1 $noreg, $noreg, 0, -1, 3 /* e8 */, 0 /* tu, mu */
+    ; CHECK-NEXT: %y:vr = PseudoVFREDMAX_VS_M1_E32 $noreg, %x, %x, 1, 5 /* e32 */, 0 /* tu, mu */
+    %x:vr = nofpexcept PseudoVFCVT_X_F_V_M1 $noreg, $noreg, 0, -1, 3 /* e8 */, 0
+    %y:vr = PseudoVFREDMAX_VS_M1_E32 $noreg, %x, %x, 1, 5 /* e32 */, 0
+...
+---
+name: vfred_vs1_vs2_incompatible_emul
+body: |
+  bb.0:
+    ; CHECK-LABEL: name: vfred_vs1_vs2_incompatible_emul
+    ; CHECK: %x:vr = nofpexcept PseudoVFCVT_X_F_V_M1 $noreg, $noreg, 0, -1, 5 /* e32 */, 0 /* tu, mu */
+    ; CHECK-NEXT: %y:vr = PseudoVFREDMAX_VS_MF2_E32 $noreg, %x, %x, 1, 5 /* e32 */, 0 /* tu, mu */
+    %x:vr = nofpexcept PseudoVFCVT_X_F_V_M1 $noreg, $noreg, 0, -1, 5 /* e32 */, 0
+    %y:vr = PseudoVFREDMAX_VS_MF2_E32 $noreg, %x, %x, 1, 5 /* e32 */, 0
+...