From c4d3dba253b49fb0e8e32109783f76453bc53653 Mon Sep 17 00:00:00 2001
From: Georg-Johann Lay <avr@gjlay.de>
Date: Thu, 8 Aug 2024 18:31:16 +0200
Subject: [PATCH] AVR: target/116295 - Fix unrecognizable insn with __flash
read.
Some loads from non-generic address-spaces are performed by
libgcc calls, and they don't have a POST_INC form. Don't consider
such insns when running -mfuse-add.
PR target/116295
gcc/
* config/avr/avr.cc (Mem_Insn::Mem_Insn): Don't consider MEMs
that are avr_mem_memx_p or avr_load_libgcc_p.
gcc/testsuite/
* gcc.target/avr/torture/pr116295.c: New test.
---
gcc/config/avr/avr.cc | 4 ++++
.../gcc.target/avr/torture/pr116295.c | 22 +++++++++++++++++++
2 files changed, 26 insertions(+)
create mode 100644 gcc/testsuite/gcc.target/avr/torture/pr116295.c
diff --git a/gcc/config/avr/avr.cc b/gcc/config/avr/avr.cc
index 0b3fd7a36d00..5cfd67a8e742 100644
--- a/gcc/config/avr/avr.cc
+++ b/gcc/config/avr/avr.cc
@@ -2121,6 +2121,10 @@ avr_pass_fuse_add::Mem_Insn::Mem_Insn (rtx_insn *insn)
else
return;
+ if (avr_mem_memx_p (mem)
+ || avr_load_libgcc_p (mem))
+ return;
+
addr = XEXP (mem, 0);
addr_code = GET_CODE (addr);
diff --git a/gcc/testsuite/gcc.target/avr/torture/pr116295.c b/gcc/testsuite/gcc.target/avr/torture/pr116295.c
new file mode 100644
index 000000000000..0b3d380ff147
--- /dev/null
+++ b/gcc/testsuite/gcc.target/avr/torture/pr116295.c
@@ -0,0 +1,22 @@
+/* { dg-do link } */
+/* { dg-additional-options "-std=gnu99" } */
+
+#ifdef __FLASH
+
+long val;
+
+__attribute__((used))
+const __flash long*
+load4_flash (const __flash long *p)
+{
+ val += *p++;
+ val += *p++;
+ return p;
+}
+
+#endif
+
+int main (void)
+{
+ return 0;
+}
--
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