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[APInt] Add the truncOrSelf resizing operator to APInt

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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
This commit is contained in:
Kerry McLaughlin 2020-11-23 11:05:50 +00:00
parent 6292b13e69
commit 1a23665577
3 changed files with 19 additions and 0 deletions
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6
include/llvm/ADT/APInt.h
View File

@ -1403,6 +1403,12 @@ public:
/// 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

6
lib/Support/APInt.cpp
View File

@ -961,6 +961,12 @@ APInt APInt::sextOrTrunc(unsigned width) const {
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);

7
unittests/ADT/APIntTest.cpp
View File

@ -2598,6 +2598,13 @@ TEST(APIntTest, sext) {
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);