Re: compiler warnings on the buildfarm

Stefan showed me via Jabber this warning:

/tmp/ccM7MfqX.s: Assembler messages:
/tmp/ccM7MfqX.s:703: Warning: 00000003fffffffc shortened to 00000000fffffffc
/tmp/ccM7MfqX.s:738: Warning: 00000003fffffffc shortened to 00000000fffffffc

He says that this comes from trgm_op.c file.  I don't get the warning
myself obviously, so I started guessing.

3FFFFFFFC = 1111111111111111111111111111111100FFFFFFFC =   11111111111111111111111111111100

So the upper 2 bits are being lost (the second number is 32 bits wide).

The only thing that I think is related is the usage of VARSIZE().  It
looks like 0x3FFFFFFF (actual constant in the toast code) is shift two
bits left.  I can see no such operation though.

-- 
Alvaro Herrera                         http://www.flickr.com/photos/alvherre/
Dios hizo a Adán, pero fue Eva quien lo hizo hombre.