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| author | Craig Topper <craig.topper@sifive.com> | 2021-03-24 21:38:53 -0700 |
|---|---|---|
| committer | Craig Topper <craig.topper@sifive.com> | 2021-03-24 21:52:48 -0700 |
| commit | c8cf8bc7ec3f8721953d4545812aaac5d21ee97a (patch) | |
| tree | 28b9e53a54c5b4d10681fed63f5a4941e0a58573 /llvm/lib/ToolDrivers/llvm-lib/LibDriver.cpp | |
| parent | 973ddb7d6e96e744a785ba64c065b592987a005f (diff) | |
| download | llvm-c8cf8bc7ec3f8721953d4545812aaac5d21ee97a.zip llvm-c8cf8bc7ec3f8721953d4545812aaac5d21ee97a.tar.gz llvm-c8cf8bc7ec3f8721953d4545812aaac5d21ee97a.tar.bz2 | |
[RISCV] Add some 32-bit ctlz and cttz idiom tests to rv64zbb.ll. NFC
This implements various idioms using ctlz/cttz like Log2, Log2_Ceil,
findFirstSetBit, etc.
Some of these demonstrate that we fail to use clzw because the
idiom breaks the isel patterns we use. The isel pattern we use
is (add (cttz (and X, 0xffffffff)), -32). Some of the idioms
cause the constant on the add to be different.
Diffstat (limited to 'llvm/lib/ToolDrivers/llvm-lib/LibDriver.cpp')
0 files changed, 0 insertions, 0 deletions