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| author | Hans-Peter Nilsson <hp@axis.com> | 2022-02-02 00:00:10 +0100 |
|---|---|---|
| committer | Hans-Peter Nilsson <hp@axis.com> | 2022-02-02 01:20:05 +0100 |
| commit | 9a7f14ef9b6b287d99b8240cdb43e8fe089ea9b3 (patch) | |
| tree | da12153432dacadcd04aa234024527b1d7435fa9 | |
| parent | 27e35bc4910e291d8676c69b08fb88fa51ba528e (diff) | |
| download | gcc-9a7f14ef9b6b287d99b8240cdb43e8fe089ea9b3.zip gcc-9a7f14ef9b6b287d99b8240cdb43e8fe089ea9b3.tar.gz gcc-9a7f14ef9b6b287d99b8240cdb43e8fe089ea9b3.tar.bz2 | |
cris: Don't discriminate against ALL_REGS in TARGET_REGISTER_MOVE_COST
When the tightest class including both SPECIAL_REGS and GENERAL_REGS
is ALL_REGS, artificially special-casing for *either* to or from, hits
artificially hard. This gets the port back to the code quality before
the previous patch ("cris: Remove CRIS v32 ACR artefacts") - except
for_vfprintf_r and _vfiprintf_r in newlib (still .8 and .4% larger).
gcc:
* config/cris/cris.cc (cris_register_move_cost): Remove special pre-ira
extra cost for ALL_REGS.
| -rw-r--r-- | gcc/config/cris/cris.cc | 18 |
1 files changed, 4 insertions, 14 deletions
diff --git a/gcc/config/cris/cris.cc b/gcc/config/cris/cris.cc index 264439c..4f97722 100644 --- a/gcc/config/cris/cris.cc +++ b/gcc/config/cris/cris.cc @@ -1683,20 +1683,10 @@ cris_register_move_cost (machine_mode mode ATTRIBUTE_UNUSED, their move cost within that class is higher. How about 7? That's 3 for a move to a GENERAL_REGS register, 3 for the move from the GENERAL_REGS register, and 1 for the increased register pressure. - Also, it's higher than the memory move cost, as it should. - We also do this for ALL_REGS, since we don't want that class to be - preferred (even to memory) at all where GENERAL_REGS doesn't fit. - Whenever it's about to be used, it's for SPECIAL_REGS. If we don't - present a higher cost for ALL_REGS than memory, a SPECIAL_REGS may be - used when a GENERAL_REGS should be used, even if there are call-saved - GENERAL_REGS left to allocate. This is because the fall-back when - the most preferred register class isn't available, isn't the next - (or next good) wider register class, but the *most widest* register - class. FIXME: pre-IRA comment, perhaps obsolete now. */ - - if ((reg_classes_intersect_p (from, SPECIAL_REGS) - && reg_classes_intersect_p (to, SPECIAL_REGS)) - || from == ALL_REGS || to == ALL_REGS) + Also, it's higher than the memory move cost, as it should be. */ + + if (reg_classes_intersect_p (from, SPECIAL_REGS) + && reg_classes_intersect_p (to, SPECIAL_REGS)) return 7; /* Make moves to/from SPECIAL_REGS slightly more expensive, as we |