[GlobalISel][X86_64] Support for G_FPTOSI

Differential Revision: https://reviews.llvm.org/D49183

llvm-svn: 341200

2 files changed, 14 insertions, 3 deletions

diff --git a/llvm/lib/Target/X86/X86LegalizerInfo.cpp b/llvm/lib/Target/X86/X86LegalizerInfo.cpp
index 2ba00708836..2b747f79e1b 100644
--- a/llvm/lib/Target/X86/X86LegalizerInfo.cpp
+++ b/llvm/lib/Target/X86/X86LegalizerInfo.cpp
@@ -219,6 +219,13 @@ void X86LegalizerInfo::setLegalizerInfo64bit() {
       .clampScalar(0, s32, s64)
       .widenScalarToNextPow2(0);
 
+  getActionDefinitionsBuilder(G_FPTOSI)
+      .legalForCartesianProduct({s32, s64})
+      .clampScalar(1, s32, s64)
+      .widenScalarToNextPow2(0)
+      .clampScalar(0, s32, s64)
+      .widenScalarToNextPow2(1);
+
   // Comparison
   setAction({G_ICMP, 1, s64}, Legal);
 
diff --git a/llvm/lib/Target/X86/X86RegisterBankInfo.cpp b/llvm/lib/Target/X86/X86RegisterBankInfo.cpp
index 9c725f154bd..47dff3113fc 100644
--- a/llvm/lib/Target/X86/X86RegisterBankInfo.cpp
+++ b/llvm/lib/Target/X86/X86RegisterBankInfo.cpp
@@ -198,15 +198,19 @@ X86RegisterBankInfo::getInstrMapping(const MachineInstr &MI) const {
     // Instruction having only floating-point operands (all scalars in VECRReg)
     getInstrPartialMappingIdxs(MI, MRI, /* isFP */ true, OpRegBankIdx);
     break;
-  case TargetOpcode::G_SITOFP: {
+  case TargetOpcode::G_SITOFP:
+  case TargetOpcode::G_FPTOSI: {
     // Some of the floating-point instructions have mixed GPR and FP operands:
     // fine-tune the computed mapping.
     auto &Op0 = MI.getOperand(0);
     auto &Op1 = MI.getOperand(1);
     const LLT Ty0 = MRI.getType(Op0.getReg());
     const LLT Ty1 = MRI.getType(Op1.getReg());
-    OpRegBankIdx[0] = getPartialMappingIdx(Ty0, /* isFP */ true);
-    OpRegBankIdx[1] = getPartialMappingIdx(Ty1, /* isFP */ false);
+
+    bool FirstArgIsFP = Opc == TargetOpcode::G_SITOFP;
+    bool SecondArgIsFP = Opc == TargetOpcode::G_FPTOSI;
+    OpRegBankIdx[0] = getPartialMappingIdx(Ty0, /* isFP */ FirstArgIsFP);
+    OpRegBankIdx[1] = getPartialMappingIdx(Ty1, /* isFP */ SecondArgIsFP);
     break;
   }
   case TargetOpcode::G_FCMP: {