🚀 go-pugleaf

I have recently been trying to use the new '-fstrength-reduce'
optimization on GNU CC Version 1.30, on an AT&T UNIX PC 3B1
Computer (which runs a Motorola 68010).  In particular, I have been
trying to get GCC to compile itself with '-fstrength-reduce' *plus*
all other possible optimizations.

I first ran into the problem with "genemit.c".  I posted this
problem several days ago.  I soon was mailed a fix from Jim Wilson
at 'wilson@ji.berkeley.edu', and the fix works.

I eventually found two more files which were being compiled
incorrectly. "reload.c" ran correctly when compiled by '-O
-fomit-frame-pointer -fcombine-regs -fforce-addr -fforce-mem' but
core-dumped when '-fstrength-reduce' was added to its compilation
line. "cccp.c" ran correctly when compiled by '-O
-fomit-frame-pointer -fcombine-regs' but core-dumped
when '-fstrength-reduce' was added. (I have already posted a bug
preventing me from using '-fforce-mem' or '-fforce-addr' on
"cccp.c".)  Unfortunately, I was unable to identify any clearly
incorrect code generation for either file, even after a fairly
close inspection of the assembly language differences with and
without '-fstrength-reduce'.

After adjusting the compilation lines for "reload.c" and "cccp.c",
GCC Version 1.30 indeed correctly compiles itself with
'-fstrength-reduce'.


	Lawrence G. Mayka
	Aurora, Illinois

	chinet!lmayk!lgm