[ARM GlobalISel] Map G_FCONSTANT

llvm-svn: 358061

llvm/lib/Target/ARM/ARMRegisterBankInfo.cpp

@@ -336,6 +336,14 @@ ARMRegisterBankInfo::getInstrMapping(const MachineInstr &MI) const {
                                     &ARM::ValueMappings[ARM::GPR3OpsIdx]});
     break;
   }
+  case G_FCONSTANT: {
+    LLT Ty = MRI.getType(MI.getOperand(0).getReg());
+    OperandsMapping = getOperandsMapping(
+        {Ty.getSizeInBits() == 64 ? &ARM::ValueMappings[ARM::DPR3OpsIdx]
+                                  : &ARM::ValueMappings[ARM::SPR3OpsIdx],
+         nullptr});
+    break;
+  }
   case G_CONSTANT:
   case G_FRAME_INDEX:
   case G_GLOBAL_VALUE:

llvm/test/CodeGen/ARM/GlobalISel/arm-regbankselect.mir

@@ -71,6 +71,9 @@
   define void @test_fpext_s32_to_s64() #0 { ret void }
   define void @test_fptrunc_s64_to_s32() #0 { ret void }
 
+  define void @test_fpconst_s32() #0 { ret void }
+  define void @test_fpconst_s64() #0 { ret void }
+
   define void @test_fptosi_s32() #0 { ret void }
   define void @test_fptosi_s64() #0 { ret void }
   define void @test_fptoui_s32() #0 { ret void }
@@ -1287,6 +1290,42 @@ body:             |
     BX_RET 14, $noreg, implicit $s0
 ...
 ---
+name:            test_fpconst_s32
+# CHECK-LABEL: name: test_fpconst_s32
+legalized:       true
+regBankSelected: false
+selected:        false
+# CHECK: registers:
+# CHECK: - { id: 0, class: fprb, preferred-register: '' }
+registers:
+  - { id: 0, class: _ }
+body:             |
+  bb.0:
+    liveins:
+
+    %0(s32) = G_FCONSTANT float -1.25
+    $s0 = COPY %0(s32)
+    BX_RET 14, $noreg, implicit $s0
+...
+---
+name:            test_fpconst_s64
+# CHECK-LABEL: name: test_fpconst_s64
+legalized:       true
+regBankSelected: false
+selected:        false
+# CHECK: registers:
+# CHECK: - { id: 0, class: fprb, preferred-register: '' }
+registers:
+  - { id: 0, class: _ }
+body:             |
+  bb.0:
+    liveins:
+
+    %0(s64) = G_FCONSTANT double -2.4
+    $d0 = COPY %0(s64)
+    BX_RET 14, $noreg, implicit $d0
+...
+---
 name:            test_fptosi_s32
 # CHECK-LABEL: name: test_fptosi_s32
 legalized:       true