unsigned SrcTySize = getBitWidth();
assert(SrcTySize < DstTySize && "Not a value extension");
- if (isFullSet() || isWrappedSet())
+ if (isFullSet() || isWrappedSet()) {
// Change into [0, 1 << src bit width)
- return ConstantRange(APInt(DstTySize,0), APInt(DstTySize,1).shl(SrcTySize));
+ APInt LowerExt(DstTySize, 0);
+ if (!Upper) // special case: [X, 0) -- not really wrapping around
+ LowerExt = Lower.zext(DstTySize);
+ return ConstantRange(LowerExt, APInt(DstTySize, 1).shl(SrcTySize));
+ }
return ConstantRange(Lower.zext(DstTySize), Upper.zext(DstTySize));
}
EXPECT_EQ(ZSome, ConstantRange(Some.getLower().zext(20),
Some.getUpper().zext(20)));
EXPECT_EQ(ZWrap, ConstantRange(APInt(20, 0), APInt(20, 0x10000)));
+
+ // zext([5, 0), 3->7) = [5, 8)
+ ConstantRange FiveZero(APInt(3, 5), APInt(3, 0));
+ EXPECT_EQ(FiveZero.zeroExtend(7), ConstantRange(APInt(7, 5), APInt(7, 8)));
}
TEST_F(ConstantRangeTest, SExt) {