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| author | Craig Topper <craig.topper@sifive.com> | 2021-07-28 08:57:02 -0700 |
|---|---|---|
| committer | Craig Topper <craig.topper@sifive.com> | 2021-07-28 09:05:45 -0700 |
| commit | 54588bcc052e5b08f90e672c33d0c1ad4eda2424 (patch) | |
| tree | 7da4d8b1146d69000cfc0ecd2143efc5f5b8ad05 /llvm/tools/llvm-objdump/llvm-objdump.cpp | |
| parent | 4e65688571221565cf1a5c1e4bb58ee2ab7c9c83 (diff) | |
| download | llvm-54588bcc052e5b08f90e672c33d0c1ad4eda2424.zip llvm-54588bcc052e5b08f90e672c33d0c1ad4eda2424.tar.gz llvm-54588bcc052e5b08f90e672c33d0c1ad4eda2424.tar.bz2 | |
[RISCV] Restrict performANY_EXTENDCombine to prevent an infinite loop.
The sign_extend we insert here can get turned into a zero_extend if
the sign bit is known zero. This can enable a setcc combine that
shrinks compares with zero_extend. This reduces the use count of
the zero_extend allowing other combines to turn it back into an
any_extend.
This restricts the combine to only cases where the result is used
by a CopyToReg. This works for my original motivating case. I
hope the CopyToReg use will prevent any converted extends from
turning back into an any_extend.
Reviewed By: luismarques
Differential Revision: https://reviews.llvm.org/D106754
Diffstat (limited to 'llvm/tools/llvm-objdump/llvm-objdump.cpp')
0 files changed, 0 insertions, 0 deletions