[ARM] Make -mcpu=generic schedule for an in-order core (Cortex-A8).

The benchmarking summarized in
http://lists.llvm.org/pipermail/llvm-dev/2017-May/113525.html showed
this is beneficial for a wide range of cores.

As is to be expected, quite a few small adaptations are needed to the
regressions tests, as the difference in scheduling results in:
- Quite a few small instruction schedule differences.
- A few changes in register allocation decisions caused by different
 instruction schedules.
- A few changes in IfConversion decisions, due to a difference in
 instruction schedule and/or the estimated cost of a branch mispredict.

llvm-svn: 306514

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/lib/Target/ARM/ARM.td b/llvm/lib/Target/ARM/ARM.td
index 6f67183df6a..840600914b1 100644
--- a/llvm/lib/Target/ARM/ARM.td
+++ b/llvm/lib/Target/ARM/ARM.td
@@ -540,7 +540,7 @@ def ARMv7s   : Architecture<"armv7s",      "ARMv7a",   [ARMv7a]>;
 //
 
 // Dummy CPU, used to target architectures
-def : ProcNoItin<"generic",                             []>;
+def : ProcessorModel<"generic",     CortexA8Model,      []>;
 
 def : ProcNoItin<"arm8",                                [ARMv4]>;
 def : ProcNoItin<"arm810",                              [ARMv4]>;