The FPv4-SP floating-point unit is generally referred to as
single-precision only, but it does have double-precision registers and
load, store and GPR<->DPR move instructions which operate on them.
This patch enables the use of these registers, the main advantage of
which is that we now comply with the AAPCS-VFP calling convention.
This partially reverts r209650, which added some AAPCS-VFP support,
but did not handle return values or alignment of double arguments in
registers.
This patch also adds tests for Thumb2 code generation for
floating-point instructions and intrinsics, which previously only
existed for ARM.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216172 91177308-0d34-0410-b5e6-96231b3b80d8
Particularly on MachO, we were generating "blx _dest" instructions on M-class
CPUs, which don't actually exist. They happen to get fixed up by the linker
into valid "bl _dest" instructions (which is why such a massive issue has
remained largely undetected), but we shouldn't rely on that.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214959 91177308-0d34-0410-b5e6-96231b3b80d8
Only use them if the subtarget has ARM mode, as these routines are implemented
as ARM code.
rdar://15302004
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193381 91177308-0d34-0410-b5e6-96231b3b80d8
The compiler-rt functions __adddf3vfp and so on exist purely to allow Thumb1
code to make use of VFP instructions by switching back to ARM mode, they make
no sense for M-class processors which don't even have an ARM mode.
Given that justification, in practice this is a platform ABI decision so the
actual check is based on that rather than CPU features.
rdar://problem/15302004
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193327 91177308-0d34-0410-b5e6-96231b3b80d8
