[MIPS GlobalISel] Select integer to floating point conversions

Select G_SITOFP and G_UITOFP for MIPS32.

Differential Revision: https://reviews.llvm.org/D63542

llvm-svn: 363912

2 files changed, 21 insertions, 0 deletions

diff --git a/llvm/lib/Target/Mips/MipsLegalizerInfo.cpp b/llvm/lib/Target/Mips/MipsLegalizerInfo.cpp
index 0f7c4dfb148..465355d66b6 100644
--- a/llvm/lib/Target/Mips/MipsLegalizerInfo.cpp
+++ b/llvm/lib/Target/Mips/MipsLegalizerInfo.cpp
@@ -120,6 +120,16 @@ MipsLegalizerInfo::MipsLegalizerInfo(const MipsSubtarget &ST) {
       .libcallForCartesianProduct({s64}, {s64, s32})
       .minScalar(0, s32);
 
+  // Int to FP conversion instructions
+  getActionDefinitionsBuilder(G_SITOFP)
+      .legalForCartesianProduct({s64, s32}, {s32})
+      .libcallForCartesianProduct({s64, s32}, {s64})
+      .minScalar(1, s32);
+
+  getActionDefinitionsBuilder(G_UITOFP)
+      .libcallForCartesianProduct({s64, s32}, {s64})
+      .minScalar(1, s32);
+
   computeTables();
   verify(*ST.getInstrInfo());
 }
diff --git a/llvm/lib/Target/Mips/MipsRegisterBankInfo.cpp b/llvm/lib/Target/Mips/MipsRegisterBankInfo.cpp
index 736756ba3bf..b9d7f0468fa 100644
--- a/llvm/lib/Target/Mips/MipsRegisterBankInfo.cpp
+++ b/llvm/lib/Target/Mips/MipsRegisterBankInfo.cpp
@@ -182,6 +182,17 @@ MipsRegisterBankInfo::getInstrMapping(const MachineInstr &MI) const {
     });
     break;
   }
+  case G_SITOFP: {
+    unsigned SizeInt = MRI.getType(MI.getOperand(1).getReg()).getSizeInBits();
+    unsigned SizeFP = MRI.getType(MI.getOperand(0).getReg()).getSizeInBits();
+    assert((SizeInt == 32) && "Unsupported integer size");
+    assert((SizeFP == 32 || SizeFP == 64) && "Unsupported floating point size");
+    OperandsMapping =
+        getOperandsMapping({SizeFP == 32 ? &Mips::ValueMappings[Mips::SPRIdx]
+                                         : &Mips::ValueMappings[Mips::DPRIdx],
+                            &Mips::ValueMappings[Mips::GPRIdx]});
+    break;
+  }
   case G_CONSTANT:
   case G_FRAME_INDEX:
   case G_GLOBAL_VALUE: