We cannot use r12 here, it is already in use as the GEP (for sibling
calls).
Committed to trunk. Will backport later, too.
Segher
2021-09-08 Segher Boessenkool <seg...@kernel.crashing.org>
PR target/102107
* config/rs6000/rs6000-logue.c (rs6000_emit_epilogue): For ELFv2 use
r11 instead of r12 for restoring CR.
---
gcc/config/rs6000/rs6000-logue.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/gcc/config/rs6000/rs6000-logue.c b/gcc/config/rs6000/rs6000-logue.c
index e363d56ecec0..9965a8aa6910 100644
--- a/gcc/config/rs6000/rs6000-logue.c
+++ b/gcc/config/rs6000/rs6000-logue.c
@@ -4815,6 +4815,10 @@ rs6000_emit_epilogue (enum epilogue_type epilogue_type)
else if (REGNO (frame_reg_rtx) == 12)
cr_save_regno = 11;
+ /* For ELFv2 r12 is already in use as the GEP. */
+ if (DEFAULT_ABI == ABI_ELFv2)
+ cr_save_regno = 11;
+
cr_save_reg = load_cr_save (cr_save_regno, frame_reg_rtx,
info->cr_save_offset + frame_off,
exit_func);
--
1.8.3.1
