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| author | Segher Boessenkool <segher@gcc.gnu.org> | 2018-07-26 12:16:48 +0200 |
|---|---|---|
| committer | Segher Boessenkool <segher@gcc.gnu.org> | 2018-07-26 12:16:48 +0200 |
| commit | 328aa7876732da9bbf851f7b9309b1f6fda1cd9d (patch) | |
| tree | c7dcf974de0227370ede0f4f56a783a580a95da1 /gcc/builtins.c | |
| parent | 977667e6b74a56db3747caaed8ba776f6cae8cdf (diff) | |
| download | gcc-328aa7876732da9bbf851f7b9309b1f6fda1cd9d.zip gcc-328aa7876732da9bbf851f7b9309b1f6fda1cd9d.tar.gz gcc-328aa7876732da9bbf851f7b9309b1f6fda1cd9d.tar.bz2 | |
combine: Another hard register problem (PR85805)
The current code in reg_nonzero_bits_for_combine allows using the
reg_stat info when last_set_mode is a different integer mode. This is
completely wrong for non-pseudos. For example, as in the PR, a value
in a DImode hard register is set by eight writes to its constituent
QImode parts. The value written to the DImode is not the same as that
written to the lowest-numbered QImode!
PR rtl-optimization/85805
* combine.c (reg_nonzero_bits_for_combine): Only use the last set
value for hard registers if that was written in the same mode.
From-SVN: r262994
Diffstat (limited to 'gcc/builtins.c')
0 files changed, 0 insertions, 0 deletions