fix 32-bit shift case in unsignedShiftRightC

src/powerpc.cpp

@@ -501,11 +501,19 @@ void unsignedShiftRightR(Context* con, unsigned size, Reg* a, Reg* b, Reg* t)
   }
 }
 
+void
+moveRR(Context* c, unsigned srcSize, Assembler::Register* src,
+       unsigned dstSize, Assembler::Register* dst);
+
 void unsignedShiftRightC(Context* con, unsigned size, Const* a, Reg* b, Reg* t)
 {
   int sh = getVal(a);
   if (size == 8) {
-    if (sh < 32) {
+    if (sh == 32) {
+      Assembler::Register high(b->high);
+      moveRR(con, 4, &high, 4, t);
+      issue(con, li(H(t),0));
+    } else if (sh < 32) {
       issue(con, srwi(R(t), R(b), sh));
       issue(con, rlwimi(R(t),H(b),32-sh,0,sh-1));
       issue(con, rlwinm(H(t),H(b),32-sh,sh,31));
@@ -596,10 +604,6 @@ jumpR(Context* c, unsigned size UNUSED, Assembler::Register* target)
   issue(c, bctr());
 }
 
-void
-moveRR(Context* c, unsigned srcSize, Assembler::Register* src,
-       unsigned dstSize, Assembler::Register* dst);
-
 void
 swapRR(Context* c, unsigned aSize, Assembler::Register* a,
        unsigned bSize, Assembler::Register* b)

test/Longs.java

@@ -39,6 +39,10 @@ public class Longs {
     return -1;
   }
 
+  private static long unsignedShiftRight32(long x) {
+    return x >>> 32;
+  }
+
   public static void main(String[] args) {
     expect(((long) negativeOne()) == -1);
 
@@ -211,6 +215,8 @@ public class Longs {
     buffer.putLong(231);
     buffer.flip();
     expect(buffer.getLong() == 231);
+
+    expect(unsignedShiftRight32(231) == 0);
   }
 
 }