Truncates the APInt if the bit width is greater than the width specified,
otherwise do nothing
Reviewed By: RKSimon
Differential Revision: https://reviews.llvm.org/D91445
/// extended, truncated, or left alone to make it that width.
APInt zextOrTrunc(unsigned width) const;
+ /// Truncate to width
+ ///
+ /// Make this APInt have the bit width given by \p width. The value is
+ /// truncated or left alone to make it that width.
+ APInt truncOrSelf(unsigned width) const;
+
/// Sign extend or truncate to width
///
/// Make this APInt have the bit width given by \p width. The value is sign
return *this;
}
+APInt APInt::truncOrSelf(unsigned width) const {
+ if (BitWidth > width)
+ return trunc(width);
+ return *this;
+}
+
APInt APInt::zextOrSelf(unsigned width) const {
if (BitWidth < width)
return zext(width);
EXPECT_EQ(63U, i32_neg1.countPopulation());
}
+TEST(APIntTest, truncOrSelf) {
+ APInt val(32, 0xFFFFFFFF);
+ EXPECT_EQ(0xFFFF, val.truncOrSelf(16));
+ EXPECT_EQ(0xFFFFFFFF, val.truncOrSelf(32));
+ EXPECT_EQ(0xFFFFFFFF, val.truncOrSelf(64));
+}
+
TEST(APIntTest, multiply) {
APInt i64(64, 1234);