/// Truncate to new width.
///
/// Truncate the APInt to a specified width. It is an error to specify a width
- /// that is greater than or equal to the current width.
+ /// that is greater than the current width.
APInt trunc(unsigned width) const;
/// Truncate to new width with unsigned saturation.
///
/// This operation sign extends the APInt to a new width. If the high order
/// bit is set, the fill on the left will be done with 1 bits, otherwise zero.
- /// It is an error to specify a width that is less than or equal to the
+ /// It is an error to specify a width that is less than the
/// current width.
APInt sext(unsigned width) const;
///
/// This operation zero extends the APInt to a new width. The high order bits
/// are filled with 0 bits. It is an error to specify a width that is less
- /// than or equal to the current width.
+ /// than the current width.
APInt zext(unsigned width) const;
/// Sign extend or truncate to width
// Truncate to new width.
APInt APInt::trunc(unsigned width) const {
- assert(width < BitWidth && "Invalid APInt Truncate request");
+ assert(width <= BitWidth && "Invalid APInt Truncate request");
if (width <= APINT_BITS_PER_WORD)
return APInt(width, getRawData()[0]);
+ if (width == BitWidth)
+ return *this;
+
APInt Result(getMemory(getNumWords(width)), width);
// Copy full words.
// Truncate to new width with unsigned saturation.
APInt APInt::truncUSat(unsigned width) const {
- assert(width < BitWidth && "Invalid APInt Truncate request");
+ assert(width <= BitWidth && "Invalid APInt Truncate request");
// Can we just losslessly truncate it?
if (isIntN(width))
// Truncate to new width with signed saturation.
APInt APInt::truncSSat(unsigned width) const {
- assert(width < BitWidth && "Invalid APInt Truncate request");
+ assert(width <= BitWidth && "Invalid APInt Truncate request");
// Can we just losslessly truncate it?
if (isSignedIntN(width))
// Sign extend to a new width.
APInt APInt::sext(unsigned Width) const {
- assert(Width > BitWidth && "Invalid APInt SignExtend request");
+ assert(Width >= BitWidth && "Invalid APInt SignExtend request");
if (Width <= APINT_BITS_PER_WORD)
return APInt(Width, SignExtend64(U.VAL, BitWidth));
+ if (Width == BitWidth)
+ return *this;
+
APInt Result(getMemory(getNumWords(Width)), Width);
// Copy words.
// Zero extend to a new width.
APInt APInt::zext(unsigned width) const {
- assert(width > BitWidth && "Invalid APInt ZeroExtend request");
+ assert(width >= BitWidth && "Invalid APInt ZeroExtend request");
if (width <= APINT_BITS_PER_WORD)
return APInt(width, U.VAL);
+ if (width == BitWidth)
+ return *this;
+
APInt Result(getMemory(getNumWords(width)), width);
// Copy words.
APInt AP_100 = APInt(8, 100);
APInt AP_200 = APInt(8, 200);
+ EXPECT_EQ(APInt(8, 100), AP_100.truncUSat(8));
EXPECT_EQ(APInt(7, 100), AP_100.truncUSat(7));
EXPECT_EQ(APInt(6, 63), AP_100.truncUSat(6));
EXPECT_EQ(APInt(5, 31), AP_100.truncUSat(5));
+ EXPECT_EQ(APInt(8, 200), AP_200.truncUSat(8));
EXPECT_EQ(APInt(7, 127), AP_200.truncUSat(7));
EXPECT_EQ(APInt(6, 63), AP_200.truncUSat(6));
EXPECT_EQ(APInt(5, 31), AP_200.truncUSat(5));
+ EXPECT_EQ(APInt(8, 42), AP_42.truncSSat(8));
EXPECT_EQ(APInt(7, 42), AP_42.truncSSat(7));
EXPECT_EQ(APInt(6, 31), AP_42.truncSSat(6));
EXPECT_EQ(APInt(5, 15), AP_42.truncSSat(5));
+ EXPECT_EQ(APInt(8, -56), AP_200.truncSSat(8));
EXPECT_EQ(APInt(7, -56), AP_200.truncSSat(7));
EXPECT_EQ(APInt(6, -32), AP_200.truncSSat(6));
EXPECT_EQ(APInt(5, -16), AP_200.truncSSat(5));
EXPECT_EQ(~uint64_t(0), APInt(1, 1).sext(64));
APInt i32_max(APInt::getSignedMaxValue(32).sext(63));
+ EXPECT_EQ(i32_max, i32_max.sext(63));
EXPECT_EQ(32U, i32_max.countLeadingZeros());
EXPECT_EQ(0U, i32_max.countTrailingZeros());
EXPECT_EQ(31U, i32_max.countPopulation());
APInt i32_min(APInt::getSignedMinValue(32).sext(63));
+ EXPECT_EQ(i32_min, i32_min.sext(63));
EXPECT_EQ(32U, i32_min.countLeadingOnes());
EXPECT_EQ(31U, i32_min.countTrailingZeros());
EXPECT_EQ(32U, i32_min.countPopulation());
APInt i32_neg1(APInt(32, ~uint64_t(0)).sext(63));
+ EXPECT_EQ(i32_neg1, i32_neg1.sext(63));
EXPECT_EQ(63U, i32_neg1.countLeadingOnes());
EXPECT_EQ(0U, i32_neg1.countTrailingZeros());
EXPECT_EQ(63U, i32_neg1.countPopulation());
}
-TEST(APIntTest, truncOrSelf) {
+TEST(APIntTest, trunc) {
APInt val(32, 0xFFFFFFFF);
+ EXPECT_EQ(0xFFFF, val.trunc(16));
+ EXPECT_EQ(0xFFFFFFFF, val.trunc(32));
EXPECT_EQ(0xFFFF, val.truncOrSelf(16));
EXPECT_EQ(0xFFFFFFFF, val.truncOrSelf(32));
EXPECT_EQ(0xFFFFFFFF, val.truncOrSelf(64));