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* [gcc r11-10322] rs6000: Fix the condition with frame_pointer_needed_indeed [PR96072]
@ 2022-10-19 11:23 Kewen Lin
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From: Kewen Lin @ 2022-10-19 11:23 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:25b6cbe8a9abd5ad9b05f23f00f9ae68aa105c99
commit r11-10322-g25b6cbe8a9abd5ad9b05f23f00f9ae68aa105c99
Author: Kewen Lin <linkw@linux.ibm.com>
Date: Mon Sep 26 00:33:18 2022 -0500
rs6000: Fix the condition with frame_pointer_needed_indeed [PR96072]
As PR96072 shows, the code adding REG_CFA_DEF_CFA reg note
makes one assumption that we have emitted one insn which
restores the frame pointer previously. That part of code
was guarded with flag frame_pointer_needed before, it was
consistent, but it was replaced with flag
frame_pointer_needed_indeed since commit r10-7981. It
caused ICE due to unexpected NULL insn.
PR target/96072
gcc/ChangeLog:
* config/rs6000/rs6000-logue.c (rs6000_emit_epilogue): Update the
condition for adding REG_CFA_DEF_CFA reg note with
frame_pointer_needed_indeed.
gcc/testsuite/ChangeLog:
* gcc.target/powerpc/pr96072.c: New test.
(cherry picked from commit 5be0950d22209f5ba69d244387228e12389a8470)
Diff:
---
gcc/config/rs6000/rs6000-logue.c | 2 +-
gcc/testsuite/gcc.target/powerpc/pr96072.c | 14 ++++++++++++++
2 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/gcc/config/rs6000/rs6000-logue.c b/gcc/config/rs6000/rs6000-logue.c
index 9965a8aa691..bdcb37c72f5 100644
--- a/gcc/config/rs6000/rs6000-logue.c
+++ b/gcc/config/rs6000/rs6000-logue.c
@@ -4924,7 +4924,7 @@ rs6000_emit_epilogue (enum epilogue_type epilogue_type)
a REG_CFA_DEF_CFA note, but that's OK; A duplicate is
discarded by dwarf2cfi.c/dwarf2out.c, and in any case would
be harmless if emitted. */
- if (frame_pointer_needed)
+ if (frame_pointer_needed_indeed)
{
insn = get_last_insn ();
add_reg_note (insn, REG_CFA_DEF_CFA,
diff --git a/gcc/testsuite/gcc.target/powerpc/pr96072.c b/gcc/testsuite/gcc.target/powerpc/pr96072.c
new file mode 100644
index 00000000000..10341c91d2f
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/pr96072.c
@@ -0,0 +1,14 @@
+/* { dg-options "-O2" } */
+
+/* This used to ICE with the SYSV ABI (PR96072). */
+
+void
+he (int jn)
+{
+ {
+ int bh[jn];
+ if (jn != 0)
+ goto wa;
+ }
+wa:;
+}
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