Refactor common code for PPC fast isel load immediate selection.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@259178 91177308-0d34-0410-b5e6-96231b3b80d8
atgreen · Jan 29, 2016 · f704e77 · f704e77
1 parent d1416a5
commit f704e77
Showing 1 changed file with 5 additions and 9 deletions.
diff --git a/lib/Target/PowerPC/PPCFastISel.cpp b/lib/Target/PowerPC/PPCFastISel.cpp
@@ -2092,20 +2092,16 @@ unsigned PPCFastISel::PPCMaterializeInt(const ConstantInt *CI, MVT VT,
       ((VT == MVT::i64) ? &PPC::G8RCRegClass : &PPC::GPRCRegClass);
 
   // If the constant is in range, use a load-immediate.
-  if (UseSExt && isInt<16>(CI->getSExtValue())) {
+  // Since LI will sign extend the constant we need to make sure that for
+  // our zeroext constants that the sign extended constant fits into 16-bits -
+  // a range of 0..0x7fff.
+  if ((UseSExt && isInt<16>(CI->getSExtValue())) ||
+      (!UseSExt && isUInt<16>(CI->getSExtValue()))) {
     unsigned Opc = (VT == MVT::i64) ? PPC::LI8 : PPC::LI;
     unsigned ImmReg = createResultReg(RC);
     BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc), ImmReg)
         .addImm(CI->getSExtValue());
     return ImmReg;
-  } else if (!UseSExt && isUInt<16>(CI->getSExtValue())) {
-    // Since LI will sign extend the constant we need to make sure that for
-    // our zeroext constants that the sign extended constant fits into 16-bits.
-    unsigned Opc = (VT == MVT::i64) ? PPC::LI8 : PPC::LI;
-    unsigned ImmReg = createResultReg(RC);
-    BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc), ImmReg)
-        .addImm(CI->getZExtValue());
-    return ImmReg;
   }
 
   // Construct the constant piecewise.