rs6000: Fix ELFv2 r12 use in epilogue

Message ID 86e6268cff328e27ee6f90e2afc35b6f437a25cd.1631111481.git.segher@kernel.crashing.org
State New
Headers show
Series
  • rs6000: Fix ELFv2 r12 use in epilogue
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Commit Message

Segher Boessenkool Sept. 8, 2021, 2:32 p.m.
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  <segher@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(+)

-- 
1.8.3.1

Patch

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);