[PATCH] D74667: [APInt] byteSwap - handle any whole byte bitwidth greater than 16-bits
Simon Pilgrim via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Sat Feb 15 04:28:48 PST 2020
RKSimon created this revision.
RKSimon added reviewers: arsenm, spatel, nikic, sanjoy, lebedev.ri.
Herald added subscribers: dexonsmith, hiraditya, wdng.
Herald added a project: LLVM.
As noted on D74621 <https://reviews.llvm.org/D74621>, the bswap intrinsic has a self imposed limitation that the type's bitwidth must be divisible by 16, but there's no reason that APInt::byteSwap must have the same limitation, given that it can already handle any byte width.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D74667
Files:
llvm/lib/Support/APInt.cpp
llvm/unittests/ADT/APIntTest.cpp
Index: llvm/unittests/ADT/APIntTest.cpp
===================================================================
--- llvm/unittests/ADT/APIntTest.cpp
+++ llvm/unittests/ADT/APIntTest.cpp
@@ -1818,11 +1818,15 @@
TEST(APIntTest, byteSwap) {
EXPECT_EQ(0x00000000, APInt(16, 0x0000).byteSwap());
EXPECT_EQ(0x0000010f, APInt(16, 0x0f01).byteSwap());
+ EXPECT_EQ(0x00ff8000, APInt(24, 0x0080ff).byteSwap());
EXPECT_EQ(0x117700ff, APInt(32, 0xff007711).byteSwap());
+ EXPECT_EQ(0x228811aaffULL, APInt(40, 0xffaa118822ULL).byteSwap());
EXPECT_EQ(0x050403020100ULL, APInt(48, 0x000102030405ULL).byteSwap());
+ EXPECT_EQ(0xff050403020100ULL, APInt(56, 0x000102030405ffULL).byteSwap());
EXPECT_EQ(0xff050403020100aaULL, APInt(64, 0xaa000102030405ffULL).byteSwap());
- for (unsigned N : {16, 32, 48, 64, 80, 96, 112, 128, 256, 1024, 1040}) {
+ for (unsigned N : {16, 24, 32, 48, 56, 64, 72, 80, 96, 112, 128, 248, 256,
+ 1024, 1032, 1040}) {
for (unsigned I = 0; I < N; I += 8) {
APInt X = APInt::getBitsSet(N, I, I + 8);
APInt Y = APInt::getBitsSet(N, N - I - 8, N - I);
Index: llvm/lib/Support/APInt.cpp
===================================================================
--- llvm/lib/Support/APInt.cpp
+++ llvm/lib/Support/APInt.cpp
@@ -670,7 +670,7 @@
}
APInt APInt::byteSwap() const {
- assert(BitWidth >= 16 && BitWidth % 16 == 0 && "Cannot byteswap!");
+ assert(BitWidth >= 16 && BitWidth % 8 == 0 && "Cannot byteswap!");
if (BitWidth == 16)
return APInt(BitWidth, ByteSwap_16(uint16_t(U.VAL)));
if (BitWidth == 32)
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