| commit | 74d925e95b7b84f4b86bd80b691b28b73db3143f | |
| author | segher <segher@138bc75d-0d04-0410-961f-82ee72b054a4> | |
| Wed, 23 Nov 2016 23:30:38 +0000 (23 23:30 +0000) | ||
| committer | segher <segher@138bc75d-0d04-0410-961f-82ee72b054a4> | |
| Wed, 23 Nov 2016 23:30:38 +0000 (23 23:30 +0000) | ||
| tree | 4f7438022bdf1a4e4449696b64295c5916e59252 | treesnapshot (tar.gz zip) |
| parent | 7bdc34461d6e3258f275ed5193026acda729955d | commitdiff |
combine: Query can_change_dest_mode before changing dest mode
As reported in https://gcc.gnu.org/ml/gcc-patches/2016-11/msg02388.html .
Changing the mode of a hard register can lead to problems, or at least
it can make worse code if the result will need reloads.
* combine.c (change_zero_ext): Only change the mode of a hard register
destination if can_change_dest_mode holds for that.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@242812 138bc75d-0d04-0410-961f-82ee72b054a4
As reported in https://gcc.gnu.org/ml/gcc-patches/2016-11/msg02388.html .
Changing the mode of a hard register can lead to problems, or at least
it can make worse code if the result will need reloads.
* combine.c (change_zero_ext): Only change the mode of a hard register
destination if can_change_dest_mode holds for that.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@242812 138bc75d-0d04-0410-961f-82ee72b054a4
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| gcc/combine.c | diffblobblamehistory |