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| author | Dimitry Andric <dimitry@andric.com> | 2016-02-19 20:14:11 +0000 |
|---|---|---|
| committer | Dimitry Andric <dimitry@andric.com> | 2016-02-19 20:14:11 +0000 |
| commit | db417b6d4021c25acb00811d40a68a96753a8352 (patch) | |
| tree | 8930eb2d2884041a5f59945f4c2563344abcb737 /lldb/source/Commands/CommandObjectSyntax.cpp | |
| parent | ffb7bd11f77a351e23f3a747873a8e3c7972d4c5 (diff) | |
| download | llvm-db417b6d4021c25acb00811d40a68a96753a8352.zip llvm-db417b6d4021c25acb00811d40a68a96753a8352.tar.gz llvm-db417b6d4021c25acb00811d40a68a96753a8352.tar.bz2 | |
Fix incorrect selection of AVX512 sqrt when OptForSize is on
Summary:
When optimizing for size, sqrt calls can be incorrectly selected as
AVX512 VSQRT instructions. This is because X86InstrAVX512.td has a
`Requires<[OptForSize]>` in its `avx512_sqrt_scalar` multiclass
definition. Even if the target does not support AVX512, the class can
apparently still be chosen, leading to an incorrect selection of
`vsqrtss`.
In PR26625, this lead to an assertion: Reg >= X86::FP0 && Reg <=
X86::FP6 && "Expected FP register!", because the `vsqrtss` instruction
requires an XMM register, which is not available on i686 CPUs.
Reviewers: grosbach, resistor, joker.eph
Subscribers: spatel, emaste, llvm-commits
Differential Revision: http://reviews.llvm.org/D17414
llvm-svn: 261360
Diffstat (limited to 'lldb/source/Commands/CommandObjectSyntax.cpp')
0 files changed, 0 insertions, 0 deletions