In ExpandFPLibCall, an assumption is made that all floating point
libcalls that take integer arguments use unsigned integers. In the case
of ldexp and frexp, this assumption is incorrect, leading to
miscompilation and subsequent target-dependent incorrect operation.
Indicate that ldexp and frexp utilize signed arguments in
ExpandFPLibCall.
Fixes#108904
Signed-off-by: Timothy Pearson <tpearson@solidsilicon.com>
On PowerPC there are 128 bit VSX registers. These registers are half
overlapped with 64 bit floating point registers (FPR). The 64 bit half
of the VXS register that does not overlap with the FPR does not overlap
with any other register class. The FPR are the only subregisters of the
VSX registers but they do not fully cover the 128 bit super register.
This leads to incorrect lane masks being created.
This patch adds phony registers for the other half of the VSX registers
in order to fully cover them and to make sure that the lane masks are
not the same for the VSX and the floating point register.
AMDGPU has native instructions and target intrinsics for this, but
these really should be subject to legalization and generic
optimizations. This will enable legalization of f16->f32 on targets
without f16 support.
Implement a somewhat horrible inline expansion for targets without
libcall support. This could be better if we could introduce control
flow (GlobalISel version not yet implemented). Support for strictfp
legalization is less complete but works for the simple cases.
