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[Bug target/64205] [5 Regression] powerpc64-linux --with-cpu=G5 bootstrap failure


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64205

--- Comment #4 from Michael Meissner <meissner at gcc dot gnu.org> ---
Is -mcpu=power7 -mno-hard-dfp really a reasonable option?

I built a toolchain using --with-cpu=power5 from subversion id 219607 on a
powerpc64 linux system, and the system bootstrapped.

If I compile the code that Peter mentioned using -m32 -O2 -fPIC -S foo01.c
-mlong-double-128 -mno-minimal-toc -g -fbuilding-libgcc -fno-stack-protector -g
-mcpu=power5, it compiles fine.

As seger mentions, -mlra fixes this (but there are still problems with -mlra).

It does fail if you enable the stfiwx instruction (added in power7), but
disable DFP.  How many people do this?  I'm not sure this is a representation
of the original bug.

I suspect if you changed TARGET_NO_SDMODE_STACK in rs6000.h to eliminate the
TARGET_DFP test it should work.
#define TARGET_NO_SDMODE_STACK    (TARGET_LFIWZX && TARGET_STFIWX)


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