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| author | Tamar Christina <tamar.christina@arm.com> | 2018-08-21 09:55:07 +0000 |
|---|---|---|
| committer | Tamar Christina <tnfchris@gcc.gnu.org> | 2018-08-21 09:55:07 +0000 |
| commit | daa9715842345da5b9c440a9fef1ed3bc916bc18 (patch) | |
| tree | 12d634187fcdcecf0de83dafe2f8355dc44386b8 /gcc/tree.c | |
| parent | 25d4036370f11d5c32fed965c2d47e0958cbe64a (diff) | |
| download | gcc-daa9715842345da5b9c440a9fef1ed3bc916bc18.zip gcc-daa9715842345da5b9c440a9fef1ed3bc916bc18.tar.gz gcc-daa9715842345da5b9c440a9fef1ed3bc916bc18.tar.bz2 | |
Fix DSE big-endian subreg crash on AArch64.
This patch fixes an ICE that would happen when extract_low_bits
is called with modes for which you can't extract a valid subreg.
e.g. taking a 32 bytes subreg from a 48 byte mode.
The ICE happens because convert_modes which eventually calls
simplify_gen_subreg does not expect the convertion to fail.
The assert in gen_lowpart_general would then be hit. The patch
changes it to validate the subreg before trying to convert the
modes. If the subreg is not possible we return NULL_RTX and bail
out early.
gcc/ChangeLog:
2018-08-21 Tamar Christina <tamar.christina@arm.com>
* expmed.c (extract_low_bits): Reject invalid subregs early.
gcc/testsuite/ChangeLog:
2018-08-21 Tamar Christina <tamar.christina@arm.com>
* gcc.target/aarch64/large_struct_copy.c: New test.
From-SVN: r263696
Diffstat (limited to 'gcc/tree.c')
0 files changed, 0 insertions, 0 deletions