https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100152
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
Summary|[10.3, 11, 12 Regression] |[10/11/12 Regression] used
|used caller-saved register |caller-saved register not
|not preserved across a |preserved across a call.
|call. |
Keywords| |ra
--- Comment #30 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Iain Sandoe from comment #29)
> what is also somewhat peculiar is that replacing the first function in the
> reduced test case with "extern void ___UTF_8_put(char *a, int b);" changes
> the code-gen for the second function.
That might hint at IPA RA which you can try disabling via -fno-ipa-ra which
in turn hints at a target issue. I'm seeing whether a cross reproduces the
issue on your reduced testcase.
Btw, the GIMPLE optimization change just exposes the issue - it can have no
influence on the used registers.
