[PATCH] D44746: [Power9]Legalize and emit code for quad-precision convert from double-precision

[Lei Huang via Phabricator via llvm-commits]

lei created this revision.
lei added reviewers: power-llvm-team, hfinkel.
Herald added subscribers: kbarton, nemanjai.

Legalize and emit code for quad-precision floating point operation `xscvdpqp`.


https://reviews.llvm.org/D44746

Files:
  lib/Target/PowerPC/PPCISelLowering.cpp
  lib/Target/PowerPC/PPCInstrVSX.td
  test/CodeGen/PowerPC/f128-arith.ll


Index: test/CodeGen/PowerPC/f128-arith.ll
===================================================================
--- test/CodeGen/PowerPC/f128-arith.ll
+++ test/CodeGen/PowerPC/f128-arith.ll
@@ -131,3 +131,30 @@
 ; CHECK stxv
 ; CHECK blr
 }
+
+; Function Attrs: norecurse nounwind
+define void @dpConv2qp(double* nocapture readonly %a, fp128* nocapture %res) {
+entry:
+  %0 = load double, double* %a, align 8
+  %conv = fpext double %0 to fp128
+  store fp128 %conv, fp128* %res, align 16
+  ret void
+; CHECK-LABEL: dpConv2qp
+; CHECK-NOT bl __extenddftf2
+; CHECK lxsd
+; CHECK xscvdpqp
+; CHECK blr
+}
+
+; Function Attrs: norecurse nounwind
+define void @dpConv2qp_02(double %a, fp128* nocapture %res) {
+entry:
+  %conv = fpext double %a to fp128
+  store fp128 %conv, fp128* %res, align 16
+  ret void
+; CHECK-LABEL: dpConv2qp_02
+; CHECK-NOT bl __extenddftf2
+; CHECK xxlor
+; CHECK xscvdpqp
+; CHECK blr
+}
Index: lib/Target/PowerPC/PPCInstrVSX.td
===================================================================
--- lib/Target/PowerPC/PPCInstrVSX.td
+++ lib/Target/PowerPC/PPCInstrVSX.td
@@ -2470,6 +2470,7 @@
 
   // Convert DP -> QP
   def XSCVDPQP  : X_VT5_XO5_VB5_TyVB<63, 22, 836, "xscvdpqp", vfrc, []>;
+  def : Pat<(f128 (fpextend f64:$src)), (f128 (XSCVDPQP $src))>;
 
   // Round & Convert QP -> DP (dword[1] is set to zero)
   def XSCVQPDP  : X_VT5_XO5_VB5   <63, 20, 836, "xscvqpdp" , []>;
Index: lib/Target/PowerPC/PPCISelLowering.cpp
===================================================================
--- lib/Target/PowerPC/PPCISelLowering.cpp
+++ lib/Target/PowerPC/PPCISelLowering.cpp
@@ -791,6 +791,8 @@
       setOperationAction(ISD::FSUB, MVT::f128, Legal);
       setOperationAction(ISD::FDIV, MVT::f128, Legal);
       setOperationAction(ISD::FMUL, MVT::f128, Legal);
+      setOperationAction(ISD::FP_EXTEND, MVT::f128, Legal);
+      setLoadExtAction(ISD::EXTLOAD, MVT::f128, MVT::f64, Expand);
 
     }
 


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