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* [gcc r11-9022] rs6000: Fix ELFv2 r12 use in epilogue
@ 2021-09-21 23:45 Segher Boessenkool
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From: Segher Boessenkool @ 2021-09-21 23:45 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:da0a5628d47ee59320dac9787f3232b0911fbc14
commit r11-9022-gda0a5628d47ee59320dac9787f3232b0911fbc14
Author: Segher Boessenkool <segher@kernel.crashing.org>
Date: Wed Sep 8 13:10:30 2021 +0000
rs6000: Fix ELFv2 r12 use in epilogue
We cannot use r12 here, it is already in use as the GEP (for sibling
calls).
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.
(cherry picked from commit 86e6268cff328e27ee6f90e2afc35b6f437a25cd)
Diff:
---
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 e363d56ecec..9965a8aa691 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);
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