[m-rev.] diff: use global registers on aarch64
zoltan.somogyi at runbox.com
Wed Jan 13 20:37:41 AEDT 2021
2021-01-13 20:34 GMT+11:00 "Julien Fischer" <jfischer at opturion.com>:
>>> Compile with -fomit-frame-pointer on aarch64.
>> I see no evidence of this in the diff to configure.ac.
> @@ -2420,10 +2420,11 @@ case "$ac_cv_prog_gcc" in yes)
> - # The test for GCC labels goes into a loop on AArch64.
> + # The test for GCC labels goes into a loop on AArch64.
> MERCURY_MSG("gcc labels do not work on AArch64")
> + CFLAGS_FOR_REGS="-fno-omit-frame-pointer"
That specifies *keeping* the frame pointer, not omitting it.
>> Nor do I see any reference to x29 in aarch64_regs.h.
> It frees it up for use by GCC, we don't use it as a global register
> variable. It will be used to hold the frame pointer unless we compile
> with -fno-omit-frame-pointer.
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