[Vm-dev] prim 40 asFloat

[ken.dickey at whidbey.com]

I am seeing something which may be related. 

I am seeing failures on a locally built VM in 2 out of 4 machines which
fail 2 Cuis FFI unit tests. 

The FFI tests pass green on aarch64 on Samsung Chromebook Plus/Linux and
LePotato/Linux. 

However, in Raspberry Pi 3 [ArchLinuxArm=linux/aarch64] and an old
x86_64 Ubuntu Linux machine I get matching failures. 

 - FFIPluginTest>>#testGenericDoubleCall2
 - FFIPluginTest>>#testMixedDoublesIntAndStruct 

In each case I am using locally built VMs with the same code from git. 
My cloned repository (https://github.com/KenDickey/opensmalltalk-vm) was
current with OpenSmalltalk's master as of a couple of weeks ago.  I have
not synched since then as I have a pull request open for my (proposed)
changes to support aarch64 and am waiting for integration into the
master to test.

The other test cases pass.

In each case a double result is properly returned (gdb) but I get lost
in gcc3x_interp.c floatObjectOf() details. 

I am time stressed at the moment, but gdb is showing that the proper
values were calculated by the ffiTest prims. 

Just after the test funs, in the FFIPlugin code (ARM64FFIPlugin.c) there
is a code line 

      result1 = floatObjectOf(floatRet);

Just before this, gdb shows 'floatRet' as correct. 

Just after, result1 looks good. 

HTH, 

-KenD
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