Alvaro Herrera wrote:
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 = 1111111111111111111111111111111100
 FFFFFFFC =   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.

The shift is in postgres.h, SET_VARSIZE_4B. I have no idea where that warning is coming from, though. What's the real source behind "ccM7MfqX.s"?

  Heikki Linnakangas

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