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| author | Peter Smith <peter.smith@linaro.org> | 2017-10-24 09:51:55 +0000 |
|---|---|---|
| committer | Peter Smith <peter.smith@linaro.org> | 2017-10-24 09:51:55 +0000 |
| commit | 820e46f3b2b3edbf86315185ea403deb6f5b623c (patch) | |
| tree | 70c78a3e6b34cebe2c7d9ffa9a303c873def5549 /llvm/docs/ProgrammersManual.rst | |
| parent | ce256a3a01b9f207f9a5eba6b313c008fa373241 (diff) | |
| download | bcm5719-llvm-820e46f3b2b3edbf86315185ea403deb6f5b623c.tar.gz bcm5719-llvm-820e46f3b2b3edbf86315185ea403deb6f5b623c.zip | |
[AArch64] Fix PR34625 -mtune without -mcpu should not set -target-cpu
When -mtune is used on AArch64 the -target-cpu is passed the value of the
cpu given to -mtune. As well as setting micro-architectural features of the
-mtune cpu, this will also add the architectural features such as support
for instructions. This can result in the backend using instructions that
are supported in the -mtune cpu but not supported in the target
architecture. For example use of the v8.1-a LSE extensions with -march=v8.
This change removes the setting of -target-cpu for -mtune, the -mcpu must
be used to set -target-cpu. This has the effect of removing all non-hard
coded benefits of mtune but it does produce correct output when -mtune cpu
with a later architecture than v8 is used.
Fixes PR34625
Differential Revision: https://reviews.llvm.org/D39179
llvm-svn: 316424
Diffstat (limited to 'llvm/docs/ProgrammersManual.rst')
0 files changed, 0 insertions, 0 deletions
