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| author | Simon Pilgrim <llvm-dev@redking.me.uk> | 2019-05-09 17:45:01 +0000 |
|---|---|---|
| committer | Simon Pilgrim <llvm-dev@redking.me.uk> | 2019-05-09 17:45:01 +0000 |
| commit | 93bfa5af48db055bdc828864432b5a4075386958 (patch) | |
| tree | 305b456f5f7d4acf01ed3af5613b722adca98075 /lldb/packages/Python/lldbsuite/test/python_api/debugger/TestDebuggerAPI.py | |
| parent | 187770dc749856ba44894e08ba806e3e4badc0f4 (diff) | |
| download | bcm5719-llvm-93bfa5af48db055bdc828864432b5a4075386958.tar.gz bcm5719-llvm-93bfa5af48db055bdc828864432b5a4075386958.zip | |
[X86][SSE] Fold add(shuffle(),shuffle()) to hadd on 'slow' targets (PR39920)
As reported on PR39920, "slow horizontal ops" targets tend to internally expand to 2*shuffle+add/sub - so if we can reduce 2*shuffle+add/sub to a hadd/sub then we should do it - similar port usage but reduced instruction count.
This works out in most cases, although the "PR22377" regression in vector-shuffle-combining.ll is annoying - going from 2*shuffle+add+shuffle to hadd+2*shuffle - I've opened PR41813 to cover this.
Differential Revision: https://reviews.llvm.org/D61308
llvm-svn: 360360
Diffstat (limited to 'lldb/packages/Python/lldbsuite/test/python_api/debugger/TestDebuggerAPI.py')
0 files changed, 0 insertions, 0 deletions
