Further update:
I ran a test and compared the sizes of the postgres binary: 2926925
with palloc0, 2931293 without, a 0.14% decrease. Not very much,
considering the 1-14% speedup of MemSet with a constant.
Tom, I really didn't think those conditional tests would be significant,
but clearly they
OK, my compiler, gcc 2.95 does the optimization at -O2, so I ran the
tests here with the attached program, testing a constant of 256 and a
variable 'j' equal to 256.
I found a 1.7% slowdown with the variable compared to the constant.
The 256 value is rather large. For a length of 32, the differe
